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doc. Ing. Vítězslav Jeřábek, CSc.

Všechny publikace

Hybrid polymer-glass planar Bragg grating as a temperature and humidity sensor

  • DOI: 10.1007/s11082-022-04003-0
  • Odkaz: https://doi.org/10.1007/s11082-022-04003-0
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    This paper presents the design and construction of a new planar optical Polymer Waveguide Bragg grating (PWBG) temperature and humidity sensor realized by polymer-glass hybrid technology composition with a new layout concept. The Bragg grating of a sensor was made by a Direct Laser Writing (DLW) in Poly (methyl methacrylate) (PMMA) formed on a multimode waveguide realized in a glass substrate by Ag+ <-> Na+ ion exchange. The fabricated hybrid Bragg grating structure exhibited more than 10 dB of the attenuation dip, equivalent to higher than 90% diffraction efficiency. The fabricated hybrid PWBG sensor exhibited high temperature and humidity sensitivity in contrast to glass-based sensors of - 48.6 pm/degrees C and 54.16 pm center dot RH-1, respectively.

Er3+/Yb3+ doped active optic Y splitter realized by diffusion waveguides with Ag+-Na+ ion exchange

  • DOI: 10.1007/s11082-021-03035-2
  • Odkaz: https://doi.org/10.1007/s11082-021-03035-2
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We reported on the active channel waveguides, formed in novel types of silicate glasses, doped with rare-earth elements, and Zn were investigated. The silicate glass GZ4 with Er3+ and Yb3+ content was studied, and the best doping ratio was estimated about luminescent properties. The composition of the glass samples (GZ4) with the content of 0.25 mol.% Er2O3 and 5.0 mol.% Yb2O3 and 12.0 mol.% resp. 18.0 mol.% ZnO was optimized. This glass was evaluated as the most suitable material for integrated amplifiers in the 1 530-1 565 nm telecommunication band. Other samples were prepared with active channel waveguides and active planar optical power splitter Y with a splitting ratio of 1x2 by two-step ion-exchange Na+<-> Ag+. Diffusion profiles of the created samples were analyzed by the EMA microscope and compared with the near mode-field distribution measurement results. Afterward, the amplification properties of the designed structures were studied, and the differential gain from 1.2 to 1.6 dB (0.48 to 0.64 dB/cm) was achieved by pumping power 200 mW at 980 nm.

Differential Gain Comparison of Optical Planar Amplifier on Silica Glasses Doped with Bi-Ge and Er, Yb Ions

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper presents the measurement and calculation of the optical amplifier gain and the optimal length of the active optical amplifier waveguide doped with Bi-Ge radiation complexes compared to an optical amplifier with active doping with ions Er3+, Yb3+. At present are using optical amplifiers for the high-capacity optical communication systems in the narrow spectral region of 1530–1560 nm, determined by the gain bandwidth of erbium-doped fiber amplifiers (EDFA) or erbium-doped optical planar amplifiers (EDPA) realized as active planar waveguides in the optical integrated circuits technique. However, it is possible increase wavelength region up to 1610 nm, where optical losses of telecommunication fibers are less than 0.3 dB per km, if appropriate amplifiers are available. In this regard, the development of novel optical amplifiers operating in this spectral region have of great importance. The paper summarizes the results measurement of the attenuation and emission spectra for net gain spectra calculation of the new ion exchange Ag+ - Na+ optical Er3+ and Yb3+ doped active planar waveguides realized on silica glass substrates and parameters of novel optical amplifiers for extension of the bandwidth from 1530 to 1610 nm doped by bismuth – erbium ions.

Precise cancer detection via the combination of functionalized SERS surfaces and convolutional neural network with independent inputs

  • Autoři: Erzina, M., Trelin, A., Guselnikova, O., Dvořánková, B., Strnadová, K., Perminova, A., Ulbrich, P., Ing. David Mareš, Ph.D., doc. Ing. Vítězslav Jeřábek, CSc., Elashnikov, R., Svorčík, V., Lyutakov, O.
  • Publikace: Sensors and Actuators B: Chemical. 2020, 308 ISSN 0925-4005.
  • Rok: 2020
  • DOI: 10.1016/j.snb.2020.127660
  • Odkaz: https://doi.org/10.1016/j.snb.2020.127660
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Combining the advanced approaches of surface functionalization and chemistry, plasmonics, surface enhanced Raman spectroscopy (SERS), and machine learning, we propose the advanced route for express and precise recognition of normal and cancer cells. Our interdisciplinary approach uses plasmonic coupling between the specific nanoparticles and underlying periodical plasmonic surface and achieves high SERS enhancement factor. The surface of gold multibranched nanoparticles (AuMs) was functionalized with different chemical groups to achieve partially selective entrapping of biomolecules from cells cultivation media and generate information-rich inputs for machine learning methods and SERS-based cells recognition. Evaluation of convolutional neural networks (CNN) training results, performed with ad hoc feature selection method, suggests that the grafted functional groups provide specificity to proteins, nucleic acids and lipids, responsible for cancer line identification. The dataset of SERS control spectra of normal and cancer cell’s metabolites were classified by the trained CNN and perfectly distinguished with 100 % prediction accuracy.

Differential gain comparison of optical planar amplifier on silica glasses doped with Bi-Ge and Er, Yb ions

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper presents the calculation of the planar optical amplifier gain and the optimal length of the active optical amplifier waveguide doped with Bi-Ge radiation complexes compared to an optical amplifier with active doping with ions Er, Yb. At present are using optical amplifiers for the high-capacity optical communication systems in the narrow spectral region of 1530–1560 nm, determined by the gain bandwidth of erbium-doped fiber amplifiers (EDFA) or erbium-doped optical planar amplifiers (EDPA) realized as active planar waveguides in the optical integrated circuits technique. However, it is possible increase wavelength region up to 1610 nm, where optical losses of telecommunication fibers are less than 0.3 dB per km, if appropriate amplifiers are available. In this regard, the development of novel optical amplifiers operating in this spectral region have of great importance. The paper summarizes the results measurement and calculation of the transmission characteristics of the amplification of the new active silica glass structures and possibilities novel optical amplifiers for extension of the bandwidth from 1530 to 1610 nm doped by bismuth- erbium ions.

Longtime stability of silver-based SERS substrate in the environment and (bio)environment with variable temperature and humidity

  • DOI: 10.1016/j.sna.2018.11.037
  • Odkaz: https://doi.org/10.1016/j.sna.2018.11.037
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The increased involving of SERS in the analytical and bioanalytical field makes this technique commercially available. However, the growing range of commercially available SERS substrates opens the question regarding the stability of SERs substrates during their storage, transportation, and utilization. In this paper, we present systematical study of the stability of SERS enhanced response of silver grating under various physical and chemical load. The silver coated periodical gratings were used as SERS substrates since they provide excellent enhancement of Raman signal, perfect reproducibility and reliability of SERS signal, achieved at the macroscale. The substrate load procedures include the temperature, humidity tests, and their combination. Since the utilization of SERS substrates often involves their interaction with various (bio)environments, the effects of physiological media were studied too. In all cases, the effects of the loads were determined from the changes of SERS effectivity and reproducibility.

Unprecedented Plasmon-Induced Nitroxide-Mediated Polymerization (PI-NMP): a Method for Preparation of Functional Surfaces

  • DOI: 10.1039/c9ta01630a
  • Odkaz: https://doi.org/10.1039/c9ta01630a
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    A plasmon as a stimulus opens up new opportunities for selective and regulated “from-surface” polymerization and functionalization of surfaces. Here, the first example of plasmon-assisted nitroxide-mediated polymerization (NMP) of stimuli-responsive block copolymers poly(N-isopropylacrylamide)-co-4‐vinylboronic acid is reported. The growth of polymer film at room temperature was achieved via plasmon-induced homolysis of alkoxyamines covalently attached to the surface of plasmon-active gold gratings at room temperature. Control of temperature, finite-difference time-domain method simulation of plasmon intensity distribution shift during polymerization, electron paramagnetic resonance experiments, and other assays provide strong support for the plasmon-initiated mechanism of NMP. We demonstrated not only the control of resulting polymer thickness but also the preparation of a SERS chip for detection of glycoproteins as a powerful example of plasmon-assisted NMP potential.

Laser patterning of transparent polymers assisted by plasmon excitation

  • DOI: 10.1039/c8sm00418h
  • Odkaz: https://doi.org/10.1039/c8sm00418h
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Plasmon-assisted lithography of thin transparent polymer films, based on polymer mass-redistribution under plasmon excitation is presented. The plasmon-supported structure was prepared by the thermal annealing of thin Ag films sputtered on glass or glass/graphene substrates. Thin films of polymethylmethacrylate, polystyrene and polylactic acid were then spin-coated on the created plasmon-supported sutructures. Subsequent laser beam writing, at the wavelength corresponding to the position of plasmon absorption, leads to mass redistribution and patterning of thin polymer films. The prepared structures were characterized by UV-Vis, confocal and AFM microscopy. The shape of prepared structures was found to be strongly dependent on a substrate type. The mechanism leading to polymer patterning was examined and attributed to the plasmon-heating. The proposed method makes possible to create different patterns in polymer films without the need for wet technological stages, powerful light sources or change in polymer optical properties.

Wideband Bismuth - Erbium Doped Optical Active Planar Waveguides

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    At present are using optical amplifiers for the high-capacity optical communication systems in the narrow spectral region of 1530–1560 nm, determined by the gain bandwidth of erbium-doped fiber amplifiers (EDFA) or erbium-doped optical planar amplifiers (EDPA) realized as active planar waveguides in the optical integrated circuits technique. However, it is possible increase wavelength region up to 1610 nm, where optical losses of telecommunication fibers are less than 0.3 dB per km, if appropriate amplifiers are available. In this regard, the development of novel optical amplifiers operating in this spectral region have of great importance. The paper summarizes the results of the measurement of the transmission characteristics of the amplification of the new ion exchange Ag+ - Na+ optical Er3+ and Yb3+ doped active planar waveguides realized on silica glass substrates and possibilities novel optical amplifiers for extension of the bandwidth from 1530 to 1610 nm doped by bismuth- erbium ions.

Design and optimization of the silver nanograting structure utilizing surface plasmon-polariton for increase of SERS sensor response

  • DOI: 10.1117/12.2291467
  • Odkaz: https://doi.org/10.1117/12.2291467
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    This paper reports on the design of the surface enhanced Raman spectroscopy (SERS) structures that were optimized through computation and simulation to obtain the best enhancement of the surface plasmon-polariton (SPP) response on these structures. The structure of the silver nano-grating was designed, fabricated, optimized and measured. The enhancement factor and the increase in the absorption capabilities associated with SPP were evaluated. The rigorous coupled wave analysis (RCWA) and finite-difference time-domain (FDTD) computational/simulation methods were utilized. The comparison between the computation simulation outputs and the measured outputs of the fabricated samples was performed.

Gain determination of optical active doped planar waveguides

  • DOI: 10.1117/12.2294030
  • Odkaz: https://doi.org/10.1117/12.2294030
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    This paper summarizes the results of the gain transmission characteristics measurement carried out on the new ion exchange Ag+ - Na+ optical Er3+ and Yb3+doped active planar waveguides realized on a silica based glass substrates. The results were used for optimization of the precursor concentration in the glass substrates. The gain measurements were performed by the time domain method using a pulse generator, as well as broadband measurement method using supercontinuum optical source in the wavelength domain. Both methods were compared and the results were graphically processed. It has been confirmed that pulse method is useful as it provides a very accurate measurement of the gain - pumping power characteristics for one wavelength. In the case of radiation spectral characteristics, our measurement exactly determined the maximum gain wavelength bandwidth of the active waveguide. The spectral characteristics of the pumped and unpumped waveguides were compared. The gain parameters of the reported silica-based glasses can be compared with the phosphate-based parameters, typically used for optical active devices application.

Ultrasensitive and reproducible SERS platform of coupled Ag grating with multibranched Au nanoparticles

  • DOI: 10.1039/c7cp01828b
  • Odkaz: https://doi.org/10.1039/c7cp01828b
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Surface-enhanced Raman scattering (SERS) spectroscopy is an extremely sensitive analytical technique that is capable of identifying the vibration signatures of target molecules up to single-molecule sensitivity. In this work, the ultrahigh sensitivity of SERS has been achieved through the immobilization of sharp-edges specific nanoparticles - so-called gold multibranched NPs (AuMs) on the silver grating surface through the biphenyl dithiol. This approach allows combining the extremely high SERS enhancement factor (better than that in the case of AuMs immobilized on the flat Ag film) with perfect reproducibility of Raman signals. The grating was created on the polymer substrate using the excimer laser modification and further metal deposition and has an "active'' area 5 x 10 mm(2), enabling the macroscale SERS substrate preparation. The wet-chemistry synthesized AuMs were then immobilized on the grating surface and the produced structure allows SERS measurements with a portable Raman spectrophotometer. The prepared structures were checked using the AFM, UV-Vis, and Raman spectroscopy techniques.

Optical active planar waveguide realized on a glass substrate

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In the paper are presented the results of the gain transmission characteristics measurement for the ion exchange Ag-Na optical active planar waveguides realized on a glass substrates. The attenuation measurements were performed by the time impulse selective wavelength method using pulse generator as well as broadband spectral measurement method using supercontinuum optical source in the wavelength domain. Both methods were compared and the results were evaluated. It has been demonstrated, that pulse method can very accurately measurement of the attenuation characteristics in dependence on the pumping power, but only for one wavelength. The minimum attenuation wavelength bandwidth of the active waveguide can be determined by the broadband spectral characteristic measurement.

Polymer waveguide Bragg gratings made by laser patterning technique

  • DOI: 10.1007/s11082-016-0438-9
  • Odkaz: https://doi.org/10.1007/s11082-016-0438-9
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Planar waveguide gratings are very useful components for planar optical structures in which they function as wavelength optical filters, demultiplexers or sensors. The Bragg gratings formed on planar optical waveguides in multimode propagation regime show multiple reflections, which can lead to enlargement of the envelope of the dip transmission spectral characteristic. This paper reports on the design and measurement of the two types multimode planar optical waveguides with diffraction Bragg grating (PWBG) made on the core or cladding layer of the structure. In the first monostructural design, PWBG was made from an optical epoxy polymer SU-8. The second hybrid PWBG design was based on ion exchange Ag+ ↔ Na+ glass waveguide. A grating was made in polymethylmethacrylate cladding layer covering the waveguide. The third-order polymer PWBGs with grating constant Λq−3 = 1.35 µm or Λq−3 = 1.2 µm were prepared by new laser-thermal patterning technique based on Marangoni effect. Based on experimental and theoretical results, the topological parameters of the structures were optimized to obtain maximum diffraction efficiency of the polymer PWBG. The beam propagation method and the rigorous coupled-wave analysis were used in theoretical modelling, simulation and evaluation of designed PWBG dimension parameters. The Bragg wavelengths transmission dips were measured in NIR optical band at λ = 1187 nm or λ = 1430 nm, respectively. The spectral transmission attenuation dips were 10 and 15 dB corresponding to 90 and 97 % diffraction efficiency of polymer PWBGs. The advantage of multimode PWBGs and its applications are discussed.

The Effect of Silver Grating and Nanoparticles Grafting for LSP-SPP Coupling and SERS Response Intensification

  • DOI: 10.1021/acs.jpcc.6b01587
  • Odkaz: https://doi.org/10.1021/acs.jpcc.6b01587
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The systematic study of structures with gold and silver nanoparticles (MeNPs) of various shape and dielectric function immobilized onto the silver grating is performed. The structures may serve as double resonance SERS (Surface-enhanced Raman spectroscopy) systems with the coupling between surface plasmon polaritons (SPPs) supported by the silver grating and localized surface plasmons (LSPs) excited on the grafted metals nanoparticles (MeNPs). The silver grating supports SPP excitation under the 785 nm wavelength illumination. Spherical silver and gold nanoparticles, triangular silver nanoprisms and gold nanorods are prepared and used with the aim to gradually cover the LSP excitation in 400-850 nm wavelength range. MeNPs are grafted through the 4,4'-biphenyldithiol (BFDT) linkers. Rhodamine 6G (R6G) molecules are added onto SERS substrates and located above and between the MeNPs. Several wavelengths (470, 532, and 785 nm) are applied to probe the SERS response. Depending on the nanoparticles type and excitation wavelength the significant SERS signal is produced by R6G or BFDT molecules. The properties of the prepared structures are simulated using Finite-difference time-domain method (FDTD). Measured and simulated SERS data are in reasonable agreement, the measured values being lower than those calculated.

Design, simulation and optimization of silver nano-grating for optimal SERS response

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In the paper are presented results of the design, simulation and optimization of a planar structure to surface enhance Raman spectroscopy (SERS) based on surface plasmon-polariton (SPP) effect used in a surface silver layer deposited on a SU-8 nano-grating. The behavior of the Ag-SU8 nano-grating and consequent SPP phenomenon was studied and simulated by solution of Maxwell's equations in periodic dielectric structures - Rigorous Coupled Wave Analysis (RCWA) algorithm enhanced by Modal Transmission Line. The convergence and simulation studies were performed for optimization of SPP structure parameters. It was found by simulation that the narrow range of grating periodicity and metal layer thickness exist, where SPPs effect can be most efficiently excited. Results and optimization of designed structure were used for fabrication of reproducible and effective SPP based SERS sensor.

Mobile Devices Displays Capabilities for the Visible Light Communication

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Visible light communication (VLC) is expected to be an important part of the next generation networks. It offers a secondary usage of visible light for an information transmission. It determines many current types of mobile devices to use for VLC without any hardware change. An important part of all communication devices is a transmitter. This paper deals with available display technology used as an optical information transmitter for the purpose of VLC. The different types of liquid crystal displays (LCD) and an organic light emitting diode (OLED) display have been compared. The important characteristics for VLC implementation such as time response, view angle, output power etc. have been compared. Moreover, the display behavior can be also influenced by display drivers. This paper also covers limitations and possibilities of driving displays using hardware implemented drivers, frame buffers or software application running on operation system as a display driver. To sum up the results, the comparison of all characteristics has been done.

Optical properties of polymer planar waveguides deposited on flexible foils

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In this paper, we present the properties of flexible polymer planar optical waveguides made of EpoCore deposited on Xerox, Melinex, Hostaphan and Plexiglas flexible foil substrates. EpoClad polymer was used as cladding between a foil substrate and the waveguide layer. Waveguide properties were measured by dark mode spectroscopy for five wavelengths (473, 632.8, 964, 1311 and 1552 nm). Propagation optical loss measurements were done by the fibre probe technique at a wavelength of 632.8 nm (He-Ne laser). The best samples had optical losses of about 0.5 dB·cm-1, and the losses generally did not exceed 1 dB·cm-1. Unlike the other structures that have been presented, our construction is fully flexible, which makes it possible to be used in innovative photonic structures.

Polymer Planar Optical Waveguides for Optical Interconnections

  • DOI: 10.1109/CLEOPR.2015.7376516
  • Odkaz: https://doi.org/10.1109/CLEOPR.2015.7376516
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper reports on technology for realization of an optical planar waveguides for optical interconnections. The waveguiding properties were measured by dark mode spectroscopy and optical loss were measured by the fiber probe technique.

Properties of the Optical Planar Polymer Waveguides Deposited on Printed Circuit Boards

  • DOI: 10.13164/re.2015.0442
  • Odkaz: https://doi.org/10.13164/re.2015.0442
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Paper reports on a technology for realization of an optical planar waveguide layer on duroid substrate and on FR4 fiber reinforced board material printed circuit boards. Waveguide core material was EpoCore polymer and for claddings we used EpoClad polymer. Design of the presented planar waveguides was realized on the bases of modified dispersion equation and was schemed for 633 nm, 964 nm, 1310 nm and 1550 nm wavelength. Waveguiding properties were measured by dark mode spectroscopy while propagation optical loss measurement was done by the fiber probe technique at wavelegnth 633 nm (He-Ne laser). The samples had optical losses lower than 0.5 dB/cm. The best sample has optical losses around 0.25 dB/cm.

Bi-directional triplexer with butterfly MMI coupler using SU-8 polymer waveguides

  • DOI: 10.1117/12.2073239
  • Odkaz: https://doi.org/10.1117/12.2073239
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about a design of a bi-directional planar optical multiplex/demultiplex filter (triplexer) for the optical part of planar hybrid WDM bi-directional transceiver in fiber-to-the-home (FTTH) PON applications. The triplex lightwave circuit is based on the Epoxy Novolak Resin SU-8 waveguides on the silica-on-silicon substrate with Polymethylmethacrylate cladding layer. The triplexer is comprised of a linear butterfly concept of multimode interference (MMI) coupler separating downstream optical signals of 1490 nm and 1550 nm. For the upstream channel of 1310 nm, an additional directional coupler (DC) is used to add optical signal of 1310 nm propagating in opposite direction. The optical triplexer was designed and optimized using beam propagation method. The insertion losses, crosstalk attenuation, and extinction ratio for all three inputs/outputs were investigated. The intended triplexer was designed using the parameters of the separated DC and MMI filter to approximate the idealized direct connection of both devices.

Compact multimode polymer optical 1x2 Y splitters with large core planar waveguide

  • DOI: 10.1007/s12596-014-0210-0
  • Odkaz: https://doi.org/10.1007/s12596-014-0210-0
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Design, fabrication and properties of compact large core multimode optical polymer splitter is presented. Norland optical adhesive glue was used as waveguide core layers, poly(methyl methacrylate) was used for substrate and the fabricated planar splitter is connected by standard plastic optical fiber. The structure was designed by beam propagation method and Y-groove for the waveguide core layer into poly(methyl methacrylate) substrate was made by using CNC engraving and polymer core layer was hardness by applied UV ligth. The splitter has insertion loss 5.2 dB for 532.8 nm and 4.1 dB for 650 nm.

Design and modeling of multimode interference structures made by two step ion exchange in glass

  • DOI: 10.1117/12.2070533
  • Odkaz: https://doi.org/10.1117/12.2070533
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Design, fabrication and RNF measurement of the optical multi-mode interference power splitter 1 to 2 with graded refractive index is reported. The design was developed by utilizing numerical solutions using the finite difference beam propagation method for operation wavelength 1550 nm. The deposition tests that led to the fabrication of the proposed structures were made after designing the structures. Several samples of optical MMI splitters 1x2 were obtained by Ag+Na+ two step field assisted ion exchange process in molten salt into a new special optical glass substrate for ion exchange technology. The refractive index profile of the channel waveguide was verified by the direct measurement near-filed method by the Refractive Near Field Profilometer.

Flexible Polymer Planar Optical Waveguides

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design, fabrication and properties of flexible polymer optical planar waveguides made of epoxy novolak resin as planar waveguides deposited on various foil substrates. The design of the presented planar waveguides was realized on the bases of modified dispersion equation and was schemed for 633 nm, 850 nm, 1310 nm and 1550 nm wavelength. Propagation optical loss measurements were done by the fibre probe technique at wavelegnth 633 nm (He-Ne laser) and samples have optical losses lower than 2 dB•cm-1. Unlike the up-to-now presented structures our constructin is fully flexible what makes it possible to be used in innovative photonics structures.

Large core planar 1 x 2 optical power splitter with acrylate and epoxy resin waveguides on polydimetylsiloxane substrate

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Fabrication process of multimode 1 x 2 optical rectangular planar power splitter suitable for low-cost short distance optical network is presented. The splitters were designed by beam propagation method for standard input/output plastic optical fibre. Materials used for the splitter were: UV acrylate photopolymer polymer or epoxy resin for optical core waveguide layers and Y-groove substrate for the core layer was poly(methyl methacrylate) or polydimetylsiloxane made by replication process on poly(methyl methacrylate) pattern. The insertion losses of 1x2 splitters with acrylate waveguide layers were around 2.7 dB at 532 nm and 4.1 dB at 650 nm and those for epoxy resin waveguide layer were around 3.7 dB at 850 nm. The 1x2 splitters were tested by signal transmission being connected to the internet network by using optoelectronic switches and we achieved the maximum possible transmission data rate as provided by the computer network.

Micro-optical Imaging System for G-PON WDM Transceiver

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper deals with the design of an optical part of a WDM transceiver for G-PON networks based on volume holographic grating triplexer (VHGT) with circle topology of the transceiver optical part. This micro-optical system offers an alternative solution of WDM transceivers and can be used as a WDM multiplexer and demultiplexer of wavelength 1310, 1490 and 1550 nm in ONU (ONT) devices. This micro-optical wavelength distribution system is imaging transmission system consisting of collimating cylindrical lenses in the circle topology with the VHGT filter placed in the middle of the circle. The article is focused on detailed description of the bidirectional micro-optical insertion system of the WDM transceiver optical part. The insertion system is described by ray matrix. The description contains a precise ray analysis of a laser, collimating and fiber coupling system with asymmetric radiation pattern at the input. Considering calculation and measurement results of insertion losses, reflections and crosstalks the influence of these characteristics on laser stability is estimated. The paper also describes an asymmetric laser radiation pattern and its focus limits by coupling into the multi-mode or single-mode output optical fiber. The advantages and disadvantages of the new WDM optical system and an optical WDM triplexer is presented.

Micro-optical insertion system for WDM transceiver

  • DOI: 10.1117/12.2073485
  • Odkaz: https://doi.org/10.1117/12.2073485
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper deals with the design of an micro-optical part of a WDM transceiver based on the circle volume holographic grating triplexer (VHGT) topology. The work is focused on detail description of the bidirectional micro-optical insertion system, especially on the coupling in the transmission direction of the WDM transceiver optical part. This micro-optical wavelength distribution system is imagine transmission system consisted of collimating cylindrical lenses set in the circle topology with the VHGT filter placed in the middle of the circle. The topology is described by ray matrices equations, calculated using analytic and numeric methods and optically measured. Considering simulation and measurement results of micro-optical insertion system the influence of these characteristics on ray path attenuation, diffraction efficiency and transceiver performance is estimated. The paper also discusses limits and conditions of the laser asymmetrical beam focus into the input/output optical fiber.

The design of polymer planar optical triplexer with butterfly MMI filter and asymmetrical directional coupler

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Paper report about the 3D design of a planar MMI (multi-mode interference) butterfly filter for wavelengths 1490 and 1550 nm using epoxypolymer SU-8 2000 on the Si/SiO2 substrate. In the second part of this paper we discuss the parameters of a planar triplex filter consisting of the butterfly MMI filter and asymmetrical directional coupler (DC).

Design and modeling of symmetric three branch polymer planar optical power dividers

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Two types of polymer-based three-branches symmetric planar optical power dividers (splitters) were designed, multimode interference (MMI) splitter and triangular shape-spacing splitter. By means of modeling the real structures were simulated as made of Epoxy Novolak Resin on silicon substrate, with silica buffer layer and polymethylmethacrylate as protection cover layer. The design of polymer waveguide structure was done by Beam Propagation Method. After comparing properties of both types of the splitters we have demonstrated that our new polymer based triangular shaped splitter can work simultaneously in broader spectrum, the only condition would be that the waveguides are single-mode guiding. It practically means that, what concerns communication wavelengths, it can on principle simultaneously operate at two mainly used wavelengths, 1310 and 1550 nm.

Design and Technology of Planar Polymer Waveguide Bragg Grating

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design, technology and fabrication of a planar optical polymer waveguide with Bragg grating. There were designed and realized two topological and technological variants of an optical waveguide grating. Polymer materials, namely poly(methyl methacrylate) (PMMA) and Epoxy-Novolak-Resin SU-8 (ENR) were chosen as basic materials of a planar lightwave grating circuit. A thin corrugated layer of the polymer is in the first case deposited on a glass substrate with an optical diffused single mode channel waveguide made by ion exchange. Bragg grating is realized here as the "cladding" layer of the diffused waveguide. In the second case is a corrugated ridge single mode waveguide made on SiO 2 /Si or borosilicate glass substrate.

Design, Fabrication and Properties of Optical Large Core Polymer Planar 1x2 Splitter

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about properties of multimode polymer 1x2 optical planar splitter. The splitters have the insertion loss around 6.96 dB for a structure comprising POF fibers and 4.38 dB (650 nm) with FG910LEC fibers.

Fabrication and Measurement of the Optical Splitters Based on Self-Imaging Effect in multimode Waveguide made by Field Assisted Ion Exchange

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Design, fabrication and RNF measurement of graded refractive index profile of the optical multi-mode interference power splitter 1 to 2 with graded refractive index is reported. The design was developed by utilizing numerical solutions using the finite difference beam propagation method for operation wavelength 1550 nm. After designing the structures were made the deposition tests that led to the fabrication of the proposed structures. Several samples of optical MMI splitters 1x2 were obtained by Ag+ - Na+ two step field assisted ion exchange process in molten salt on new special optical glass substrate for ion exchange technology. The refractive index profile of the channel waveguide was verified by the direct measurement near-filed method by the Refractive Near Field Profilometer.

Large Core Polymer Planar Waveguides for Optical Interconnects

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design, fabrication and properties of the optical multimode polymer large core waveguides. The waveguide proposal is done for input/output standard 1 mm Plastic Optical Fiber and the design optical waveguides were used for implementation of the optical splitters for optical interconnects. Norland Optical Adhesive and Epoxy Novolak Resin polymers were used as core waveguides.

Optical splitters based on self-imaging effect in multi-mode waveguide made by ion exchange in glass

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Paper deals with design and modeling of single mode optical multi-mode interference structures with graded refractive index is reported. Several samples of planar optical channel waveguides were obtained by Ag + Na + and K + Na + one step thermal ion exchange process in molten salt on GIL49 glass substrate and new special optical glass for ion exchange technology. Waveguide properties were measured by optical mode spectroscopy. Obtained data were used for further design and modeling of single mode channel waveguide and subsequently for the design of 1 to 3 multimode interference power splitter in order to improve simulation accuracy. Designs were developed by utilizing finite difference beam propagation method.

The design of polymer planar optical triplexer with MMI filter and directional coupler

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Optical bidirectional WDM transceiver is a key component of the Passive Optical Network of the Fiber to the Home topology. Essential parts of such transceivers are filters that combine multiplexing and demultiplexing function of optical signal (triplexing filters). In this paper we report about a design of a new planar optical multi-wavelength selective system triplexing filter, which combines a multimode interference filter with directional coupler based on the epoxy polymer SU-8 on Si/SiO2 substrate. The optical triplexing filter was designed using the Beam Propagation Method. The aim of this project was to optimize the triplexing filter optical parameters and to minimize the planar optical wavelength selective system dimensions. The multimode interference filter was used for separation of downstream optical signal in designed optoelectronic integrated WDM transceiver. The directional coupler was used for add of upstream optical signal.

Waveguide Bragg Grating Filters Made from Optical Polymers

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about the planar optical waveguide with a diffraction Bragg grating made in an optical polymer, which exhibits filter function useable for Passive Optical Network Fiber to the Home (PON FTTH) and sensor components. There were designed two topological and technological variants of an optical waveguide grating structures. The distribution of optical field and topological constants of waveguide grating was calculated and simulated by RSoft’s BeamPROP and GratingMode programs. The influence of topological parameters of waveguide grating filters like grating groove depth, waveguide layer thickness, length of the grating, etc. on key characteristic properties of the diffraction grating filter including diffraction efficiency, the central reflected wavelength, the bandwidth at 50% of the maximum transmission for guided modes and insertion losses were mainly investigated. Subsequently, structural parameters were optimized with respect to used fabrication methods.

Waveguide periodic structures from optical polymers usable as filter or sensor of temperature

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper deals with the design, implementation, diagnostics, technological and topological optimization of planar waveguide structures with Bragg gratings, filtering and demultiplexing signals in passive optical information networks and sensor applications.

DESIGN AND MODELING OF MULTIMODE INTERFERENCE POWER SPLITTERS MADE BY ION EXCHANGE IN GLASS

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Design and modeling of a single mode optical power splitter with graded refractive index is reported. Several samples of optical planar waveguides were obtained by Ag + ↔Na + one step thermal ion exchange process in a molten salt. Waveguide properties were measured by optical mode spectroscopy with the METRICON system. Obtained data were used for further design and modeling of power splitters with Y-branching and Multi-Mode Interference in order to improve simulation accuracy. Designs were developed by utilizing Beam Propagation Method in the BeamPROP software by RSoft Design Group.

DESIGN AND MODELING OF MULTIMODE INTERFERENCE POWER SPLITTERS MADE BY ION EXCHANGE IN GLASS

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Design and modeling of single mode optical multi-mode interference structures with graded refractive index is reported. Several samples of optical planar waveguides were obtained by Ag+Na+ one step thermal ion exchange process in molten salt. Obtained data were used for further design and modeling of multi-mode interference power splitters and multiplexers in order to improve simulation accuracy. Designs were developed by utilizing Beam Propagation Method in the BeamPROP software by RSoft Design Group.

DESIGN AND MODELING OF THE SYMMETRIC 1 X 3 OPTICAL POLYMER PLANAR POWER DIVIDER

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design two types of polymer symmetric 1x3 power splitter. First step was to design single mode polymer optical waveguides. Then we continued with designing of three-branch waveguide with triangular shaped spacing and after that we designed 1x3 splitter based on a principle of multi-mode interference. Finally we compared properties of those two structures. The design of the polymer waveguides structure was done by using Beam Propagation Method using RSoft software.

Design and Properties of Planar Polymer Waveguide Bragg Grating Filter

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about the planar optical waveguide filter using a diffraction Bragg grating made in polymer, that shows filter function useable for PON FTTH components. There were designed two topological and technological variants of an optical waveguide grating filters. The first type of the optical waveguide grating filter was realized as a laser-heat shaped layer of PMMA (polymethylmethacrylate) on a glass substrate with an optical ion exchange waveguide. The second type was realized by laser-heat shaping of a SU-8 (epoxypolymer) ridge waveguide on SiO2/Si substrate. The distribution of optical field and topological constants of waveguide grating filters was calculated and simulated by RSoft's BMP and Grating Mode programs. Influence of topological parameters of waveguide grating filters like grating groove depth, waveguide layer thickness, length of the grating, etc. on key characteristic properties of the diffraction grating filter including diffraction efficiency, central reflected wavelength, the bandwidth at 50% of the maximum transmission (FWHM) for guided modes and insertion losses were mainly investigated. The waveguide filters were realized as relief Bragg gratings with roughly sinusoidal cross section of the layer that had influence at a guided optical mode. A Grating's period was chosen to satisfied higher order Bragg's phase condition due to technological limitations of the laser-heat manufacturing process. The grating constant can be continuously varied, which is a major asset for optimization process of Bragg's gratings with space modulated profile. Main properties of the optimized prototypes were then measured and evaluated.

Design of the novel wavelength triplexer using multiple polymer microring resonators

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about new design of wavelength triplexer using multiple polymer optical microring resonators. Triplexer consists of two downstream wavelength channels operating at 1490 ± 10 nm, 1555 ± 10 nm and one upstream wavelength channel operating at 1310 ± 50 nm. The parallel coupled double ring resonator was used for separation of the optical signal band at 1555 nm and filtered out signal bands 1310 nm and 1490 nm. The serially coupled triple optical microring resonator was used for separation of the optical signal band at 1490 nm and filtered out signal bands 1310 nm and 1555 nm. The design was done by using FullWAVETM software by the finite-difference time-domain method. Simulation showed that optical losses for band at 1555 nm were -3 dB and crosstalk between signal bands 1555 nm and 1490 nm was 24 dB. Calculated optical losses for channel 1490 nm were less than -2.5 dB and signal bands at 1555 nm was filtered out with less than 18 dB loss. The bands at 1310 nm were fully filtered out from both downstream wavelength channels operating at bands 1490 nm and 1555 nm.

DESIGN OF THE PLANAR OPTICAL MMI FILTER

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The optical devices which combine multiplexing and demultiplexing function of the optical radiation are frequentlyused as optical distributing filters for application in informatics. The planar optical integrated circuit devices are mostly realized on a Si/SiO2 , Si/Si3N4 and polymer materials, which often use the layer technology. In this paper we report about the design planar MMI (multimode interference) filter for wavelength 1490 nm and 1550 nm, using the polymer SU8 on the Si/SiO2 substrate. The MMI filter use self imagine effect, which is very important for integrated optical interference components. For the simulation of the planar MMI filter was used Beam Prop program package from RSoft company.

HYBRID MICROOPTICAL WDM RECEIVER FOR PON COMMUNICATION

  • DOI: 10.15598/aeee.v10i2.622
  • Odkaz: https://doi.org/10.15598/aeee.v10i2.622
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper presents the design, simulation and construction results of the wavelength vivision multiplex (WDM) optical hybrid receiver module for the passive optical network (PON). The optical WDM receiver was constructed using system of three micromodules in the new circle topology. The optical micromodule contains multimode fiber pigtail 50/125 µm, VHGT filter with collimation lens and two microwave optoelectronics receiver micromodules (OE receiver micromodules). OE receiver micromodules were designed by use small signal equivalent electrical circuit model and noise model, from which the mathematically solved the transmittancefunction, which was used for calculation and simulation of the optimal frequency characteristics and signal to noise ratio. For determine the limit frequency of OE receiver micromodule, the transcendent equation with transmittance function was numerically solved. OE receiver micromodule was composed of decollimation lenses and microwave optoelectronics receivers with bandwidth 2,5 GHz and alternatively in SMD technology with bandwidth 1,25 GHz, using the thin layer hybrid technology. WDM receiver use radiation 1490 nm for internet and 1550 nm for digital TV signals download information.

MICROOPTICAL COLLIMATION SYSTEM FOR WDM RECEIVER WITH A BRAGG VOLUME GRATING

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design and measurement of wavelength division multiplexing (WDM) microoptical collimation system for WDM receiver module (WDM-Receiver). The collimation system is represented by ray matrix model and the focal distances obtained in the matrix are verified experimentally. The optic focal system: collimation lens- PIN photodiode (PIN-PD) is characterized to found the dependence between the diameter of the collimated beam and the covered active area in the PIN PD. The optical micromodule uses a microoptics hybrid integration technology with collimation lenses and a volume holographic Bragg grating triplex filter (VHG triplexer) for wavelength multiplex/ demultiplex.

Modeling of the Multimode Polymer Interference Optical Wavelength 1490/1555 nm Demultiplexer

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design and modelling of the optical 1490/1555 nm wavelength division multiplexer based on principle of the multimode interference and using Epoxy Novolak Resin waveguide. The structure was designed by Beam Propagation Method.

Optical Properties of Bi-Doped Epoxy Novolak Resin (ENR) Containing Ce, Dy and Y Ions

  • DOI: 10.1002/app.34945
  • Odkaz: https://doi.org/10.1002/app.34945
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In this article, we report on the optical properties of Bismuth doped Epoxy Novolak Resin (ENR) co-doped with Dysprosium, Cerium, and Yttrium ions. The polymer layers containing 1.0 to 20.0 at % of Bismuth were fabricated by spin-coating onto silicon or quartz substrates. The properties of the material were studied using several methods with special regards to its potential utilization in photonics devices. Transmission spectra were taken in the range from 350 to 1600 nm, while photoluminescence spectra around 1300 nm were recorded by using excitation of semiconductor lasers operating at 808 nm and at 980 nm (Ex= 250 mW). Optical properties of the samples were evaluated on the bases of the concentration of the Bismuth ions as well as on the concentrations of the co-doping ions and showed close relations between concentration of the dopants and intensity of the luminescence band at 1300 nm. Our results proved that the Bismuth doped ENR has a strong potential for application in active photonics structures, as it has excellent optical properties and very easy and not demanding fabrication procedures.

Optical properties of Poly(Methylmetacrylimide) doped with bismut ions

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about the optical properties of bismuth doped poly(methylmethacrylimide) layers and bismuth doped poly(methylmethacrylimide) layers co-doped with ytterbium ions. Photoluminescence spectra around 1300 nm were observed and co-doping with ytterbium ions had positive effect on the 1300 nm luminescence. Optical properties of the samples were evaluated on the bases of the concentration of the bismuth ions as well as that of the co-doping with ytterbium ions and showed, e.g., close relations between concentration of the dopants and intensity of the luminescence band around at 1300 nm.

Optical System using VHGT Filter for Wavelength Division Multiplexed (WDM) Hybrid Optoelectronic Receiver

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    This paper is about the design of three micro modules in a new circle topology and measurement of the optical micro module which uses a micro optics hybrid integration technology with collimation lenses and a volume holographic Bragg grating triplexer (VHGT) filter for wavelength multiplexing/de-multiplexing. The collimation system is represented by a ray matrix model and the focal distances obtained in the matrix are verified experimentally. The optic focal system: "collimation lens- PIN photodiode (PD)" is characterized to be found in the relationship between the diameter of the beam collimated and the active area covered in the PIN PD. The optical micro module with a VHGT filter and two optoelectronic receiver micro modules are for receiving download information (internet and digital TV signals).

Sistema Colimado Microoptico para receptores Wdm con filtro de Bragg

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Se presenta el diseño y mediciones de un receptor multiplexor por división de longitud de onda (MDL) en la tecnología de las microondas son su haz de luz colimado. El sistema de colimación es representado matemáticamente por un siste- ma de matrices mediante el cual se determina el punto focal el cual es verificado experimentalmente. El módulo óptico usa la tecnología micro-óptica híbrida integrada con lentes colimados y filtro de Bragg para multiplexar y demultiplexar los rayos de luz.

THE PLANAR OPTICAL WAVELENGTH SELECTIVE SYSTEM WITH THE MMI FILTER AND THE DIRECTIONAL COUPLER

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The planar design of the WDM transceivers are mostly realized on a Si/SiO2 dielectric materials, which often use the layer technology. The optical devices which combine multiplexing and demultiplexing function of the optical radiation (triplex filters) frequently used the optical distributing thin filters or directional filters. These integrated WDM transceivers have dimensions of several centimeters and compatible planar arrangement (set-up) of the optical and optoelectronic components. In the first part of this paper we report about the design planar MMI interference filter and directional coupler for wavelengths 1310nm,1490nm,1550nm, using epoxipolymer SU-8 2000 on the Si/SiO2 substrate. Second part will be devoted to optimizing the coupling parameters between MMI interference filter and a directional coupler to minimize insertion loss and crosstalk. The design were made with respect to the use of the planar optical wave selective system in a optical communications. The aim is to improve the optical parameters in addition to the reduction in size the planar optical wavelength selective system. Based on the designed parameters will then be made realization the planar optical wavelength selective system planar optical wavelength selective assembly usefull in optical networks as wavelength selective triplex filter.

Design and construction of a WDM transceiver with VHGT using hybrid integration technology

  • DOI: 10.1002/pssc.201084068
  • Odkaz: https://doi.org/10.1002/pssc.201084068
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design and construction of WDM bidirectional transceiver module (TRx) for the passive optical network (PON) of a fiber to the home FTTH topology. The TRx uses a microoptics hybrid integration technology with volume holographic Bragg grating triplex filter (VHGT) and a collimation lenses for wavelength multiplexing/demultiplexing. Our optical WDM transceiver TRx has been constructed using system of a four micromodules in the new circle topology. The optical micromodul with VHGT filter, two optoelectronics receivers micromodules for receiving download information (internet and digital TV signals) and optoelectronic transceiver micromodul for transmitting of a upload information.

Design and Modelling of the Integrated Polymer Microring Resonators on Silicon Substrate

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about new polymer optical microresonators (OM) optical filters designed for operating wavelengths 1550 nm and filtering out wavelength 1490 nm. The first step was to design a single mode polymer waveguide by using BeamPROPTM software and after that a microring resonators were designed by Finite-Difference Time-Domain method using FullWAVETM software.

Design of Epoxy Novolak Resin Optical Waveguides for Demultiplexers Based on Multimode Interference and Optical Ring Resonators

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design of optical polymer waveguides for Y-branch power splitters, wavelength demultiplexers based on multimode interference and optical ring resonators. Epoxy novolak resin was chosen as core waveguide materials due to excellent properties and easy fabrication process. Waveguides was fabricated onto silica-on-silicon substrate due to easy integration process with other optical and electrical elements. Design of the waveguides was done by using RSoft software and waveguides were fabricated by standard photolithography process. Propagation optical loss measurements were done by using the cut-back method and the best samples had optical losses around 0.5 dB/cm at 1310 nm.

Design of Y-Branch Optical Polymer Waveguides

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design of 1 x 2 and 1 x 4 polymer power optical Y-branches. First we design single mode polymer optical structure than optical 1x2 splitters were design by using BeamPROP software and finally optical power splitter 1x4 was proposed. Epoxy Novolak Resin polymer was chosen as core waveguides layer due to excellent optical properties and easy fabrication process. Silica on silicon layer was used as substrates and Polymethylmethacrylate was used as protection cover layer. Design structures were fabricated by photolithography process and optical properties were measured by Metricon prison system.

Design, Fabrication and Properties of Rib Poly(methylmethacrylimide) Optical Waveguides

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design, fabrication and properties of the polymer optical waveguides deposited on silica-on-silicon substrate. The design of the waveguides is based on a concept that geometric dimensions of the single mode polymer waveguide are determined by geometrical parameters of the silica layer. The design of the waveguides was schemed for 650 nm, 850 nm, 1310 nm and 1550 nm wavelength. The design of the presented planar waveguides was realized on the bases of modified dispersion equation while the ridge waveguides design was proposed following the Fischbeck concept. Both designs were refined applying RSoft software using beam propagation method. Poly(methylmethacrylimide) was used as the waveguide core material and polymethylmethacrylate was used as a cover protection layer. Propagation optical loss measurements were done by using the cut-back method and the best samples had optical losses lower than 0.6 dB/cm at 650 nm, 1310 nm and 1550 nm.

Epoxy Novolak Resin Optical Microring Resonator

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design, fabrication and properties of the polymer optical microring resonator. First step was to design single mode rib waveguides by using BeamPROP software and then microring resonator was designed by using FullWAVE software, which is part of the RSoft software. The design was done for operating wavelength 1550 nm. The resonator was designed on the bases of optical polymer waveguides epoxy novolak resin deposited onto silica-on-silicon substrate. Two types of cover layers, Polymethylmethacrylate, Cytop, or, eventually, no cover layer was applied. Depositions tests for fabrication of the design structures were done by using standard photolithography process and electron lithography process.

Microoptical and Microwave Design and Construction of a Micromodules for WDM Receiver

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper presents design a novel topology and technology solution of IC microoptical hybrid integrated WDM receiver, composed of the optical and optoelectronic micromodules. The optical micromodule use volume holographic grating triplexer (VHGT) as unique optical multiwavlength demultiplexing element in WDM microsystem, The downstream microoptical imagine system was verified by construction and measurement of the microoptical hybrid integrated WDM receiver. Very low insertion optical losses and optical crosstalk of VHGT element imply the high sensitivity and the transmit distance of optical SM fiber. Further work was concentrated on design and construction of WDM transceiver realized by planar lightwave circuit hybrid integration technology. The optical part will be solved by polymer or glass interference filter or microoptical resonators.

Microoptical Collimation System for WDM Receiver with a Bragg Volume Grating

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design and measurement of wavelength division multiplexing (WDM) microoptical collimation system for WDM receiver module (WDM- Receiver). The collimation system is represented by ray matrix model and the focal distances obtained in the matrix are verified experimentally. The optic focal system: collimation lens- PIN photodiode (PIN-PD) is characterized to found the dependence between the diameter of the collimated beam and the covered active area in the PIN PD. The optical micromodule uses a microoptics hybrid integration technology with collimation lenses and a volume holographic Bragg grating triplex filter (VHGT) for wavelength multiplexing/ demultiplexing.

Mikrooptický systém s vysokou účinností pro WDM hybridní optoelektronické přijímače

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Článek se zabývá návrhem, konstrukcí a měřením parametrů mikrooptického WDM systému skládajícího se z kolimačních čoček a objemové holografické triplexní mřížky ( triplexeru), Triplexer představuje filtr s vysokou difrakční účinností, který provádí prostorovou distribuci optických paprsků nesoucí informaci, podle jejich vlnové délky. Tento mikrooptický WDM systém bude dále použit při realizaci hybridního optoelektronického WDM přijímače pro sítě PON-FTTx pracujícího na vlnových délkách 1490 nm (širokopásmový internet) a 1550 nm (digitální televizní signál). V článku jsou publikovány výsledky měření optické vazby s triplexerem pro dvě orientace kolimátorů. Byly změřeny klíčové parametry triplexeru (difrakční účinnost, difrakčních úhel, vložný útlum a přeslechy do jednotlivých optických kanálů) pro vlnové délky λ=1310 nm, λ=1490 nm a λ=1550 nm.

Optické planární vlnovody z pryskyřice Epoxy Novolak Resin

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Příspěvek popisuje návrh, výrobu a vlastnosti optických polymerních vlnovodů. Vlnovody byly navrženy tak aby fungovaly na křemíkových substrátech a na substrátech z galia arzenidu, a aby pracovaly na vlnových délkách 650 nm a 1310 nm. Jádro vlnovodu tvoří nový typ polymeru Epoxy Novolak Resin. Návrh vlnovodu byl proveden pomocí programu od fy RSoft, který využívá beam propagation metod. Vlnovody byly vyráběny metodou spin coating a tvar vlnovodů byl vytvářen pomocí optické litografie. U vlnovodů byl měřen optický útlum metodou dvou délek a nejlepší vlnovody měly optický útlum menší než 1 dB/cm na vlnových délkách 650 nm a 1310 nm.

Polymer Optical Microring Filter for Passive Optical Network Applications

  • DOI: 10.1109/IQEC-CLEO.2011.6193633
  • Odkaz: https://doi.org/10.1109/IQEC-CLEO.2011.6193633
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design of the Epoxy Novolak Resin polymer optical microring resonator filter operating at 1490 nm. The design was done by using FullWAVETM software and MR was constructed by using electron beam lithography.

Simple way of fabrication of Epoxy Novolak Resin optical waveguides on silicon substrate

  • DOI: 10.1002/pssc.201084031
  • Odkaz: https://doi.org/10.1002/pssc.201084031
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design, fabrication and properties of the polymer optical waveguides. The design of the waveguides is based on a concept that geometric dimensions of the single mode polymer waveguide are determined by geometrical parameters of the silica layer. The design of the presented planar waveguides was realized on the bases of modified dispersion equation while the ridge waveguides design was proposed following the Fischbeck concept. Epoxy Novolak Resin was used as the waveguide core material and polymethylmethacrylate was used as a cover protection layer. Propagation optical loss measurements were done by using the cut-back method. The best samples had optical losses lower than 1.5 dB/cm at 650 nm and 0.5 dB/cm at 1310 nm.

The Microoptical and Microwave Design and Construction of a WDM Receiver with Bragg Volume Grating Using Hybrid Integration Technology

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about microoptical and microwave design and construction of WDM receiver module useable for the passive optical network (PON) of a fiber to the home (FTTH) topology. The WDM receiver uses a microoptics hybrid integration technology with volume holographic Bragg grating triplex filter (VHGT) and a collimation lenses for wavelength demultiplexing. A VHGT filters are ideal optical beam distribution element having high diffraction efficiency wavelength and very low insertion loses and optical crosstalk. The optical imaging system was design in the paraxial approximation by ray-transfer matrix. The optical WDM receiver was constructed using system of a three micromodules in the new circle topology, the optical micromodule and two microwave optoelectronics receiver micromodules (OE receivers). WDM receiver use radiation 1490 nm for internet and 1550 nm for digital TV signals download information.

Theoretical Model of the Bistable Semiconductor Laser Diode Based on the Rate Equations

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper describes theoretical and experimental results that enabled the authors to proof optical bistability behavior of a specially modified bistable semiconductor laser diode (BLD) created on a structure with a saturable absorption section. A mathematical model of the light-current characteristic, condition for bistability and the basic parameters of the hysteresis loop were derived by solving a system of three rate equations. That system was used for simulation of the light-current characteristic and conditions of bistability of the realized BLDs. For selected operating points of the simulated lightcurrent characteristic the parameters of hysteresis loop and element values of the BLD electrical equivalent circuit for small signal variations were calculated. The bistability was experimentally measured by the new time method devised for impulse bistability verification (IBV).

WDM hybrid microoptical transceiver with bragg volume grating

  • DOI: 10.1117/12.911293
  • Odkaz: https://doi.org/10.1117/12.911293
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper presents the design, simulation and construction results of the wavelength division multiplex bidirectional transceiver module (WDM transceiver) for the passive optical network (PON) of a fiber to the home (FTTH) topology network. WDM transceiver uses a microoptical hybrid integration technology with volume holographic Bragg grating triplex filter -VHGT and a collimation lenses imagine system for wavelength multiplexing/ demultiplexing. This transmission type VHGT filter has high diffraction angle, very low insertion loses and optical crosstalk, which guide to very good technical parameters of transceiver module. WDM transceiver has been constructed using system of a four micromodules in the new circle topology.

Design and construction of a WDM transceiver VHGT using hybrid integration technology

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design and construction of WDM bidirectional transceiver module (TRx) for the passive optical network (PON) of a fiber to the home FTTH topology. The TRx uses a microoptics hybrid integration technology with volume holographic Bragg grating triplex filter (VHGT) and a collimation lenses for wavelength multiplexing/ demultiplexing. Our optical WDM transceiver TRx has been constructed using system of a four micromodules in the new circle topology. The optical micromodul with VHGT filter, two optoelectronics receivers micromodules for receiving download information (internet and digital TV signals) and optoelectronic transceiver micromodul for transmitting of a upload information.

Design and construction of a WDM transceiver VHGT using hybrid integration technology

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design and construction of WDM bidirectional transceiver module (TRx) for the passive optical network (PON) of a fiber to the home FTTH topology. The TRx uses a microoptics hybrid integration technology with volume holographic Bragg grating triplex filter (VHGT) and a collimation lenses for wavelength multiplexing/ demultiplexing. Our optical WDM transceiver TRx has been constructed using system of a four micromodules in the new circle topology. The optical micromodul with VHGT filter, two optoelectronics receivers micromodules for receiving download information (internet and digital TV signals) and optoelectronic transceiver micromodul for transmitting of a upload information.

Design and Construction Transceiver Module Using Polymer PLC Hybrid Integration Technology

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Planar lightwave circuit (PLC) hybrid integration technology enables us to construct component by combining PLC with passive function and active optoelectronics devices hybridized on a PLC. The contribution is an overview of the PLC hybrid integration technology and describes experiment and simulation, which led to the construction hybrid integrated PLC for optoelectronics information receiving and transmitting. Our optical triplex TRx module has been designed with RSoft simulation programs and constructed using a polymer PLC hybrid integration technology. The transceiver module consists of a planar optical epoxy polymer waveguides with a volume holographic grating triplex filter, surface-illuminated photodetectors and spot-size converted Fabry-Pérot laser diode in SMD package. An optical TRx module transmits a 1310 nm radiation upload and receives a 1490 nm download data as well as a 1550 nm download digital video signals for wavelength division multiplexing WDM cable TV application.

Design of Polymer 1 x 3 Multimode Interference Optical Power Splitter Operating at 650 nm and 1310 nm

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In this paper we report about design of the polymer optical 1 x 3 multimode interference (MMI) splitter operating at 650 and 1310 nm. The polymer splitter was designed by using RSoft software based on beam propagation method. Epoxy novolak resin polymer was used as core waveguides layer, silicon substrate with silica layer was used as buffer layer and polymethylmethacrylate was used as protection cover layer. Simulation showed that the maximum output energy for 1310 nm is 3x31 % for Lmmi= 382 μm (length of MMI) while for the splitter supporting both 650 and 1310 nm the maximal output energy will be 3x29.5% at Lmmi= 379 μm.

Design of Polymer Optical Waveguides for Wavelength Demultiplexers Based on Multimode Interference and Optical Ring Resonators

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design of optical polymer waveguides for Y-branch power splitters, wavelength demultiplexers based on multimode interference and optical ring resonators. Various materials are used for realization of the optical photonics structure including glass, optical crystal and semiconductors. These materials and technologies used for fabrication of the waveguides are rather complex and expensive. Therefore new materials like polymers are very attractive candidates for integrated optical structures. Polymer optical waveguides have a lot of advantages including well-controlled refractive indices, good thermal stabilities, high transparency in the visible and near-infrared spectra and low optical losses. Photonics structures fabricated from polymers are also low cost and require only simple production technology.

Design of polymer wavelength splitter 1310 nm / 1550 nm based on multimode interferences

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In this paper we are going to report about design of 1 x 2 1310/1550 nm optical polymer wavelength division multiplexer. There is a growing interest in Multimode Interference (MMI) couplers in the design of photonics circuits due to huge potential in new optical communications system. In the literature there are only few papers reporting about various materials used in the design and realization of MMI based structures, most of them are semiconductors. Among them only two papers described MMI structure based on polymer materials.

Design, Fabrication and Measurement Polymethylmethacrylate Optical Waveguides Prepared by Modification of Surface Profile by Applying Electric Field

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In this paper, we describe results of our recent experiments on electric field preparation of the optical waveguides on PMMA films, their calculation and measurements. Planar PMMA films were prepared on Si/SiO2 wafers and measured using waveguiding technique. Micro-sized patterns were created on thin PMMA films by the effect of external electric field, perpendicular to the film surface. Waveguiding properties of prepared structures were checked by fitting optical fibre connected to laser light source. Optical losses of the farbicated channel waveguides were measured by using the cut-back method at wavelength 650 nm and output field was obtained by beam propagation analyzer BP104IR. Properties of the PMMA layers were simulated by beam propagation method by using BeamProp module from RSoft software.

Microoptical triplexer systém with high efficeincy for WDM hybrid optoelectronic receivers

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper presents the design, construction and measuring of an microoptical WDM demultiplexing system composed by collimation lenses and optical double grating filter VHGT with high diffraction efficiency for receiving part of hybrid microoptical WDM transceiver (WDM receiver) for PON-FTTH topology. The hybrid integration technology achieves a cost-effective optoelectronic receiver. We found the dimension parameters of the microoptical system from the MMF (mutlimode fiber) across the collimation lens - triplexer - collimation lens complex to surface PIN photodiode. The results were to obtain the optimal coupling with maximal sensitivity of WDM receiver. A piezoelectrically driven ten axis micromanipulator was used to set the triplexer to the correct diffracted beams position, in the alignment process.

MIKROOPTICKÁ SOUSTAVA PRO HOLOGRAFICKOU TRIPLEXNÍ MŘÍŽKU

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Příspěvek pojednává o návrhu a měření vlastností kolimační mikrooptické soustavy MM vlákno - válcová mikročočka pro objemovou holografickou mikrooptickou triplexní mřížku - Volume Holografic Greating Triplexer (VHGT), od firmy Ondax Ltd s ohledem na využití VHGT jako MUX/DEMUX členu pro hybridní integrovaný mikrooptický WDM transceiver, využitelný v sítích typu PON-FTTH.

Návrh a realizace WDM transceiveru realizovaného hybridní technologií

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Příspěvek pojednává o návrhu a konstrukci WDM optoelektronického transceiveru, který je klíčovým prvkem pro účastnickou stranu sítě PON-FTTH, a který je realizovaný mikrooptickou hybridní technologií. Základem konstrukcí klasických mikrooptických WDM modulů pro sítě PON-FTTH jsou řešení s distribuovanými hranoly, zrcadly a diskrétními optoelektronickými prvky, umístěnými v pouzdrech TO fixovaných do těla modulu. Planární řešení WDM transceiverů jsou realizována na dielektrických materiálech Si/SiO2 za použití vrstvových technologij Jako optické členy pro multiplexaci a demultiplexaci (MUX/DEMUX) záření často využívají distribuovaných optických tenkovrstvých filtrů, nebo směrových vazebních členů. Tyto integrované WDM transceivery mají rozměry i několik centimetrů a planárně kompatibilní uspořádání optických a optoelektronických prvků.

Optical and Spectroscopic Properties of Polymer Layers Doped with Rare Earth Ions

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In this paper we report about Erbium (Er), Ytterbium (Yb), Europium (Eu), Neodymium (Nd), Thulium (Tm), Holmium (Ho), Praseodymium (Pr) and Dysprosium (Dy) doped polymer layers on silicon and quartz substrate. We chose these RE ions because Tm3+ doped photonics materials can have emission bands around 1470 nm and 1600-2100 nm. Er3+ doped materials can emit at 1530 nm. Ho3+ and Yb3+ ions were used as co-dopants. Tm3+ doped polymers were co-doped with Ho3+ ions and Er3+ doped polymers were co-doped with Yb3+ ion. Trivalent Dy3+ ion is studied for emission at 1300 nm. Other RE ions were chosen for photoluminescence study in visible region.

Optical PMMA Waveguides Fabricated by Modification of Refractive Index Applying Electric Field

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In this paper, we describe results of our recent experiments on electric field assisted patterning of thin polymethylmethacrylate (PMMA) layers. Micro-sized patterns were created on thin PMMA films by the effect of external electric field, perpendicular to the film surface. The PMMA film, prepared by spin-coating onto Si or Si/SiO2 wafer, was heated to the fluid temperature (275°C) and a linear pattern was created by the effect of electric field produced by a strip electrode. The dependence of the form and size of the created patterns on the intensity of the electric field, exposure time and initial film thickness was examined. Wave guiding properties were analyzed by mode spectroscopy, optical losses were measured by dispersive method and the created patterns were analyzed by optical microscopy and profilometer.

Properties of Epoxy Novolak Resin Layers Doped with Bismuth for Photoluminescence Near 1300 nm

  • DOI: 10.1002/app.32039
  • Odkaz: https://doi.org/10.1002/app.32039
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In this paper we report on the optical properties of bismuth ions doped Epoxy Novolak Resin (ENR). The polymer layers containing 1.0 to 20.0 at. % of bismuth were fabricated by spin-coating onto silicon or quartz substrates. The properties of the material were studied using several methods with special regards to its potential utilization in photonics devices. Photoluminescence spectra around 1300 nm were recorded by using excitation of semiconductor lasers operating at 808 nm (Ex= 500 mW). Optical properties of bismuth doped Epoxy Novolak Resin were evaluated on the bases of the concentration of the bismuth ions involved in the samples and showed, e.g. close relations between concentration of the dopants and intensity of the luminescence band at 1300 nm. IR spectra showed only negligible changes in the original substrate resin. Our results proved that the bismuth doped ENR have a potential for utilization in photonics devices.

Simple fabrication of Epoxy Novolak Resin optical waveguides on silicon substrate

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In this paper we report about polymer optical waveguides fabricated on silica on silicon. The presented waveguide design is based upon modification of concept proposed by Fischbeck which was deduced by Marcatili. This concept is based on idea that geometric dimension of the single mode polymer waveguide is specified by silica layer. The design of the presented waveguides was also proposed applying RSoft software using beam propagation method. The waveguide refractive indices of the optical layers were measured by ellipsometry in spectral range from 400 nm to 1600 nm before the proposal. The obtained values were used for theoretical design to make the simulation accurate. The design of the waveguides was done for two wavelength 650 nm and 1310 nm respectively.

Bismuth(III) Doped Polymer Layers for Telecommunication Applications

  • DOI: 10.1109/CLEOPR.2009.5292489
  • Odkaz: https://doi.org/10.1109/CLEOPR.2009.5292489
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Bismuth(III)-doped Epoxy Novolak Resin polymer as a novel promising photonics material was designed for applications in 1310 nm telecommunication window. It was fabricated by spin coating on silicon or silica substrates and its optical properties are evaluated in the terms on the Bi(III) concentration.

Design and construction WDM type triplex optical receiver module using system multimode polymeric PLC hybrid integration technology

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about more detail design and constructions of the WDM triplex optical receive part of the triplex transceiver module for subscribe part passive optical network PON-FTTH. The triplex optical receiver module consists of a epoxy novolak resin polymer or a microoptic planar lightwave circuit (PLC) made by hybrid integration technology with volume holographic grating triplex filter VHGT and surface-illuminated photodetectors in SMD package. The hybrid PLC has composed from two parts - a microoptical or polymer planar optical waveguide including VHGT filter section and an optoelectronic microwave section. The both parts are placed on the composite substrate.

DESIGN AND CONSTRUCTION WDM TYPE TRIPLEX OPTICAL RECEIVER MODULE USING SYSTEM MULTIMODE POLYMERIC PLC HYBRID INTEGRATION TECHNOLOGY

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about more detail design and constructions of the WDM triplex optical receive part of the triplex transceiver module for subscribe part passive optical network PON-FTTH. The triplex optical receiver module consists of an epoxy novolak resin polymer or a microoptic planar lightwave circuit (PLC) made by hybrid integration technology with volume holographic grating triplex filter VHGT and surface-illuminated photodetectors in SMD package. The hybrid PLC has composed from two parts - a microoptical or polymer planar optical waveguide including VHGT filter section and an optoelectronic microwave section. The both parts are placed on the composite substrate.

Designed and Fabrication of ENR Polymer Rib Optical Waveguides

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design, fabrication and properties of the Epoxy Novolak Resin (ENR) polymer rib optical waveguides. Polymer waveguides were fabricated on silicon substrate with silica buffer layer and Epoxy novolak resin was used as the waveguide core material. Polymethylmethacrylate was used as a cover protection layer. The optical waveguides were designed by using software RSOFT using Beam propagation method and the minimum (critical) waveguiding thicknesses of the deposited layers were calculated using dispersion equation. Polymer layers were fabricated by spin coating and optical waveguides were form by using standard photolithography process. Propagation optical loss measurements were carried at 650 nm and 1310 nm using the cut-back method and the best samples had optical losses lower than 1.0 dB/cm at 650 nm and 0.6 dB/cm at 1310 nm.

Designed and Fabrication of ENR Polymer Rib Optical Waveguides

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design, fabrication and properties of the polymer optical channel waveguides. Epoxy novolak resin polymer was used as the waveguide core material and polymethylmethacrylate was used as a cover layer. Samples were fabricated by spin coating on silica on silicon substrate. The design of the waveguide was done by RSoft software using beam propagation method. The fabricated channel waveguides had optical losses lower than 3.0 dB/cm. The best samples had optical losses lower than 1.0 dB/cm at 650 nm and 0.5 dB/cm at 1310 nm.

Hybridní optoelektronický přijímač s gigahertzovou šířkou pásma

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Článek se zabývá návrhem, simulací a realizací hybridního mikrovlnného optoelektronického přijímače (OE) pracujícího na vlnové délce záření 1300 nm s šířkou pásma 2,5 GHz. V článku jsou uvedeny výsledky návrhu a měření závislosti šířky pásma modulace harmonickým signálem optického přijímače na obvodovém propojení mezi InGaAs PIN fotodiodou a HBT zesilovačem. Kapacita prostorového náboje PIN fotodiody je kompenzována diskrétní indukčností sériově napojenou mezi PIN fotodiodu a HBT zesilovač tak, aby došlo k optimálnímu rozšíření modulační charakteristiky OE přijímač při přijatelném zvlnění využitím peaking efektu. Konečně je provedeno porovnání odměřené S21 modulační charakteristiky, se simulací v programu WinMide. Tento mikrovlnný OE přijímač byl využit k realizaci planárního hybridního integrovaného optoelektronického přijímače.

New Technique for Preparation of Epoxy Novolak Resin Polymer Waveguides

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about fabrication of polymer optical channel waveguides using non-contact and non-photolithography technology procedure based on lithography induced self-construction method. The reported waveguides were fabricated by spin coating deposition of epoxy novolak resin on silica on silicon or on silicon substrates. We studied optimization of preparation of the polymer structures and the influence of electric field on the properties of the ENR optical waveguides.

Optical properties of erbium and erbium/ytterbium doped polymethylmethacrylate

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In this paper we report on the fabrication and properties of Er3+ and Er3+/Yb3+ doped Polymethylmethacrylate (PMMA) layers. The reported layers were fabricated by spin coating on silicon or on quartz substrates. Infrared spectroscopy was used for an investigation of O-H stretching vibration. Measurement were made of the transmission spectra in the wavelength ranges from 350 to 700 nm for the Er3+ doped samples and from 900 to 1040 nm for the Yb3+ doped samples. The refractive indices were investigated in the spectral range from 300 to 1100 nm using optical ellipsometry and the photoluminescence spectra were measured in the infrared region.

Optical Properties of Gallium Nitride Layers Doped with Erbium and Erbium + Ytterbium Ions

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper described properties of erbium and erbium + ytterbium doped gallium nitride layers.

Optical properties of PMMA doped with erbium(III) and ytterbium(III) complexes

  • DOI: 10.1002/pen.21418
  • Odkaz: https://doi.org/10.1002/pen.21418
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In this paper we report on fabrication and optical/spectroscopic properties of Polymethylmethacrylate (PMMA) doped with RE (Er3+ and Er3+/Yb3+) ions. Infrared spectroscopy revealed only very weak O-H stretching vibration peaks in the samples. Measurement of transmission spectra in the wavelength ranges from 300 to 700 nm for Er3+ doped samples and from 900 to 1050 nm for Yb3+ doped samples, enabled us to observe the 4G11/2 (377 nm) and 2H11/2 (519 nm) transmission bands typical for Er3+ doped samples, as well as the 2F5/2 (975 nm) band typical for Yb3+ doped samples. Under excitation at 980 nm, at room temperature, the characteristic Er3+ emission at 1530 nm was also observed with improving trend when the higher Rare Earth (RE) concentrations were applied. The results indicate that the PMMA reveals very low tendency to the RE clustering, which, together with low cost and easy fabrication make it a material with a great potential in the active photonics devices.

Pattern formation in PMMA film induced by electric field

  • DOI: 10.1002/polb.21718
  • Odkaz: https://doi.org/10.1002/polb.21718
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Micro-sized patterns were created on thin poly(methyl methacrylate) (PMMA) films by the effect of external field, perpendicular to the film surface. The PMMA film, prepared by spin-coating onto Si wafer, was heated to the fluid temperature (275 °C) and a linear pattern was created by the effect of electric field produced by a strip electrode. In another experiment, a round pattern was created as a result of local laser heating of the PMMA film under homogenous electrical field. The created patterns were analyzed by optical microscopy and profile meter. The dependence of the form and size of the created patterns on the intensity of the electric field, exposure time, and initial film thickness was examined. Wave guiding property of a linear pattern, produced by the above technique, was examined in a simple experiment.

Performance of the Planar Hybride Optoelectronic Receiver

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The article report on theoretical results and measured parameters of the VHGT triplex filter, which was used for input part of the bidirectional transceiver TRx module. The photonic receiver is the main part of the hybrid integrated microwave optoelectronic transceiver TRx (transceiver Trx).

Polymer Layers Doped with Rare Earth Ions for Photonics Applications

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In this paper we report about fabrication and properties of polymer layres doped with rare earth (RE) ions. The reported layers were fabricated by spin coating onto Si, Si/SiO2 or onto glass substrates. For the RE doping RE chloride or RE fluoride powder dissolved in C5H9NO or C2H6OS were used. The research was focused on investigation of the influence of the amount of the dopants on the transmission and photoluminescence spectra.

POLYMER OPTICAL WAVEGUIDES FOR HYBRID PHOTONICS APPLICATIONS

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design and fabrication of the low loss polymer optical waveguides for hybrid optoelectronics applications. The waveguides were designed by using beam propagation method and deposited by spin-coating onto GaAs substrates. Epoxy Novolak Resin polymer was used as core waveguides layer, Cytop was used as buffer layer and Polymethylmethacrylate was used as protection cover layer. The channel waveguides were formed by photolithography process. The best samples had optical losses around 0.63 dB/cm at 650 nm and 0.53 dB/cm at 1310 nm.

Spectroscopy Properties of Epoxy Novolak Resin Doped with Rare Earth Ions

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In this paper we report about new spectroscopy properties of rare earth doped epoxy novolak resin polymer. The polymer samples were doped with rare earths like praseodymium, neodymium, samarium, europium or dysprosium. The samples were fabricated by spin coating on silicon substrates or by pouring the polymers containing the rare earth into bottomless molds placed on quartz substrates. Infrared spectroscopy was used for checking the presence of the O-H stretching vibration in the samples and how they were subsequently affected by various concentrations of the doping rare earth salts. Typical bands corresponding to the rare earth ions in the region from 350 nm to 2900 nm of the absorption spectra were studied in order to find optimal concentrations of the particular dopants.

The VHGT Triplex Filter for the Hybrid Photonic Integrated Circuits with the Polymer Optical Waveguides

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    This paper report about design and construction of the bidirectional transceiver TRx module for subscriber part of the passive optical network PON for a fiber to the home FTTH topology. The TRx module consists of a epoxy novolak resin polymer planar lightwave circuit (PLC) hybrid integration technology with volume holographic grating triplex filter VHGT, surface-illuminated photodetectors and spot-size converted Fabry-Pérot laser diode in SMD package. The hybrid PLC has composed from a two parts - polymer optical waveguide including VHGT filter section and a optoelectronic microwave section. The both parts are placed on the composite substrate.

VLNOVĚ SELEKTIVNÍ OPTICKÁ ROZBOČNICE SE SOUSTAVOU PLANÁRNÍCH OPTICKÝCH POLYMERNÍCH VLNOVODŮ

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    V tomto příspěvku pojednáme o měření vlastností vlnově selektivní optické rozbočnice "VHGT" (Volume Holografic Greating Triplexer) realizované objemovou holografickou mřížkou navazující na soustavu planárních polymerních multividových optických vlnovodů. Vlastnosti výše uvedené holografické mřížky jsou zkoumány s ohledem na použití v hybridním integrovaném optoelektronickém obvodu transceiveru pro sítě PON-FTTH. Návrh navazující soustavy polymerních vlnovodů vychází z vlastností vlnově selektivní rozbočnice ověřených měřeními a porovnaných s údaji udávanými výrobcem (zejména difrakčními úhly.

WDM PLANÁRNÍ OPTOELEKTRONICKÝ POLYMEROVÝ PŘIJÍMAČ

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Článek popisuje návrh a konstrukci WDM planárního optoelektronického triplexního přijímače (OTP), který bude součástí planárního WDM triplexního transceiveru pro sítě PON - FTTH. OTP je realizován hybridní integrační technologií. V článku jsou popsány klíčové vlastnosti holografického triplexního mřížkového Braggovského filtru (triplexního filtru), využívaného v přijímači, a podmínky navázání záření na multivi- dový polymerový vlnovod. Dále je ukázán návrh a konstrukce mikrovlnného optoelektronického přijímače s HBT zesilovačem, využívající induktivní kompenzaci frekvenční charakteristiky. Realizovaný projekt je založen na zkušenostech s návr- hem a konstrukcí hybridních optoelektronických přijímačů a implementací polymer- ních planárních vlnovodů na pracovištích ČVUT a VŠCHT v Praze.

Construction of a VHGT-Attached WDM-Type Triplex Transceiver Module Using Polymer PLC Hybrid Integration Technology

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The article report about design and construction of the bidirectional transceiver module for subscriber part of the passive optical network PON for a fiber to the home FTTH topology.

Design and Construction of a VHGT-Attached WDM -Type Triplex Transceiver Module Using Polymer PLC Hybrid Integration Technology

  • DOI: 10.1117/12.818008
  • Odkaz: https://doi.org/10.1117/12.818008
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Paper report about design and construction of the bidirectional transceiver TRx module for subscriber part of the passive optical network PON for a fiber to the home FTTH topology. The TRx module consists of a epoxy novolak resin polymer planar lightwave circuit (PLC) hybrid integration technology with volume holographic grating triplex filter VHGT, surface-illuminated photodetectors and spot-size converted Fabry-Pérot laser diode in SMD package. The hybrid PLC has composed from a two parts - polymer optical waveguide including VHGT filter section and a optoelectronic microwave section. The both parts are placed on the composite substrate.

Design and Construction of a VHGT-Attached WDM -Type Triplex Transceiver Module Using Polymer PLC Hybrid Integration Technology

  • DOI: 10.1109/COMITE.2008.4569929
  • Odkaz: https://doi.org/10.1109/COMITE.2008.4569929
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about design and construction of the bidirectional transceiver TRx module for subscriber part of the passive optical network PON for a fiber to the home FTTH topology. The TRx module consists of a epoxy novolak resin polymer planar lightwave circuit (PLC) hybrid integration technology with volume holographic grating triplex filter VHGT, surface-illuminated photodetectors and spot-size converted Fabry-Pérot laser diode in SMD package. The hybrid PLC has composed from a two parts - polymer optical waveguide including VHGT filter section and a optoelectronic microwave section. The both parts are placed on the composite substrate.

Epoxy Novlak Resin Optical Waveguides

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper report about optical properties of Epoxy Novolak Resin polymer used as optical waveguides.

Experimental Method for Verifying the Bistability and Theoretical Model of the Semiconductor Laser Diode Made by the Rate Equations

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper report about experimental method for verifying the bistability and theoretical model of the semiconductor laser diode made by the rate equations

Fabrications and Propreries of Multi-Mode Epoxy Novolak Resin Polymer Optical Waveguides

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about fabrication and properties of the Epoxy novolak resin optical waveguides. The waveguides were designed by using RSOFT software and by using modification dispersion equation. Planar polymer waveguides were fabricated by spin coating onto silica on silicon substrate while channel waveguides were formed by using standard photolithography. The polymer layers had waveguiding properties and the number of propagating modes varied from 1 to 10 depending on the thickness of the deposited layers. The best samples had optical losses 2.64 dB/cm at 650 nm and 0.42 dB/cm at 1550 nm.

Investigation of band gap of Dy doped GaN layers using the transmittance measurement

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In this paper we report about dysprosium doped gallium nitride layers fabricated by magnetron sputtering on silicon and corning glass substrate. Structure of the deposited layers was studied by the X-ray diffraction (XRD). Composition of the fabricated samples was checked by RTG spectrometer ARL 9400. Transmission spectra were measured by UV-VIS-NIR Spectrometer (UV 3600 Shimadzu) in spectral region from 280 nm to 1800 nm and the optical band gap Eg has been determined by the absorption coefficient values using Tauc's procedure, i.e. from the relationship αhv = K(hv − Eg)2. The optical band gap Eg of fabricated GaN layers without dysprosium doping was 2.91 eV. The optical band gap of dysprosium doped GaN layers varied from 2.93 eV to 3.52 eV depend on increasing of content of dysprosium ions.

Investigation Properties of GaN Layers Doped with Er3+ and Er3++Yb3+ Ions Using the Transmittance Measurement

  • DOI: 10.1117/12.818015
  • Odkaz: https://doi.org/10.1117/12.818015
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper report about fabrication and properties of Gallium Nitride (GaN) layers doped with erbium or mixture of erbium and ytterbium ions. Transmission spectra in the spectral range from 280 to 800 nm taken by the spectrometer Varian Cary 50 showed that the increasing concentration of the dopants shifts the absorption edge to the lower wavelengths. Optical band gap Eg was determined from the absorption coefficient values using Tauc's procedure and the obtained values varied from 3.08 eV to 3.89 eV depending on the erbium or erbium plus ytterbium doping. Photoluminescence emission at 1530 nm due to the Er3+ intra-4f 4I13/2 -> 4I15/2 transition was observed by using excitation of semiconductor lasers operating at 980 nm.

Optical Materials Doped with Rare Earth Ions

Optical Properties of Dy3+ Doped Epoxy Novolak Resin

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about properties of epoxy novolak resin polymer doped with dysprosium ions. The polymer layers were fabricated by spin-coating onto silicon substrates, or pouring epoxy novolak resin solution into bottomless molds placed on a quartz substrate and leaving them to dry. Rather strong bands around 3366 cm-1 in the infrared spectra indicated presence of the O-H groups. Absorption measurements were done in the spectral range from 300 nm to 3000 nm. Optical band gap Eg was determined from the absorption coefficient values using Tauc's procedure, i.e., from the relationship αhv = A(hv - Eg)2 and the obtained values varied from 3.489 eV to 3.539 eV depending on the amount of dysprosium ions involved in the samples. Photoluminescence spectra around 1300 nm were investigated by using excitation of He-Ne laser operating at 632.8 nm and two semiconductor lasers operating at 980 nm and 827 nm.

Optical Properties of Dy3+ Doped Epoxy Novolak Resin

  • Autoři: doc. Ing. Václav Prajzler, Ph.D., doc. Ing. Vítězslav Jeřábek, CSc., Hüttel, I., Lyutakov, O., Špirková, J., Machovič, V., Oswald, J., Zavadil, J.
  • Publikace: Proceedings of SPIE 7061 - Novel Optical Systems Design and Optimization XI. Bellingham (stát Washington): SPIE, 2008. p. 706119-1-706119-8. ISBN 978-0-8194-7281-6.
  • Rok: 2008
  • DOI: 10.1117/12.793788
  • Odkaz: https://doi.org/10.1117/12.793788
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about properties of epoxy novolak resin polymer doped with dysprosium ions. The polymer layers were fabricated by spin-coated onto silicon substrates, or pouring epoxy novolak resin solution into bottomless molds placed on a quartz substrate and leaving them to dry. Infrared spectroscopy was used for investigation of O-H vibrations and we observed absorption band about 3390 cm-1 corresponds to these vibrations. Optical band gap Eg has been determined from the absorption coefficient values using Tauc's procedure, i.e. from the relationship αhv = A(hv − Eg)2. The optical band gap Eg varied from 3.489 eV to 3.539 eV depends on content of dysprosium ions. Photoluminescence spectra around 1300 nm were investigated by using excitation of He-Ne laser operating at 632.8 nm and two semiconductor lasers operating at 980 nm and 827 nm.

Optical Properties of PMMA Polymer Doped with Er3+ and Er3+/Yb3+ Ions

  • DOI: 10.1088/1742-6596/100/1/012021
  • Odkaz: https://doi.org/10.1088/1742-6596/100/1/012021
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In this paper we report about fabrication and properties of polymethylmethacrylate doped with Er3+ and Yb3+ ions. The reported layers were fabricated by spin coating onto Si, Si/SiO2 or onto glass substrates. For the Er and Yb doping ErCl3 and YbCl3 or ErF3 and YbF3 powder dissolved in C5H9NO or C2H6OS were used. The research was focused on investigation of the influence of the amount of the dopants on the photoluminescence spectra at 1.55 μm. It was found that the increasing Er3+ content increased the intensity of the luminescence and that co-doping with ytterbium ions increased the intensity of the luminescence as well.

Properties of Erbium Doped Hydrogenated Amorphous Carbon Layers Fabricated by Sputtering and Plasma Assisted Chemical Vapor Deposition

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report about properties of carbon layers doped with Er3+ ions fabricated by Plasma Assisted Chemical Vapor Deposition (PACVD) and by sputtering on silicon or glass substrates. The structure of the samples was characterized by X-ray diffraction and their composition was determined by Rutherford Backscattering Spectroscopy and Elastic Recoil Detection Analysis. The Absorbance spectrum was taken in the spectral range from 400 nm to 600 nm. Photoluminescence spectra were obtained using two types of Ar laser (λex=514.5 nm, lex=488 nm) and also using a semiconductor laser (λex=980 nm). Samples fabricated by magnetron sputtering exhibited typical emission at 1530 nm when pumped at 514.5 nm.

Spectroscopic and photoluminescence study of epoxy novalak resin polymer doped with Er3+, Tm3+ and Er3+/Yb3+ ions

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In this paper we report on the optical properties of epoxy novalak resin (ENR) doped with Er3+, Tm3+ ions and co-doped with Er3+/Yb3+ ions. Infrared spectroscopy was used for investigation of O-H vibrations and we observed absorption band about 3390 cm-1 corresponds to these vibrations. The absorbance measurement shoved five strong bands at 441 nm (4F3/2), 448 nm (4F5/5), 488 nm (4F7/2), 517 nm (2H11/2) and 539 nm (4S3/2) for the sample containing 10.0 at.% Er3+, while the typical absorption band occurred at 976 nm (2F5/2) for the sample containing 10.0 at.% Yb3+. The samples containing 20.0 at. % of Tm3+ ions had four absorption bands at 464 nm (1G4), 658 nm (3F2), 686 nm (3F3) and 1212 nm (3H5). Semiconductor laser excitation (λex= 980 nm) was used for photoluminescence measurement and the samples had typical 1530 nm emission due to 4I13/2 ... 4I15/2 Er3+ transition.

The hybrid photonic planar integrated receiver with a polymer optical waveguide

  • DOI: 10.1117/12.817997
  • Odkaz: https://doi.org/10.1117/12.817997
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    This article describes design of the photonic receiver composed of the system polymer planar waveguides, InGaAs p-i-n photodiode and integrated HBT amplifier on a low loss composite substrate. The photonic receiver was the main part of the hybrid integrated microwave optoelectronic transceiver TRx (transciever TRx) for the optical networks PON (passive optical networks) with FTTH (fiber-to-the-home) topology. In this article are presented the research results of three-dimensional field between output facet of a optical waveguide and p-i-n photodiode. In terms of our research, there was optimized the optical coupling among the facet waveguide and pi-n photodiode and the electrical coupling among p-i-n photodiode and input of HBT amplifier. The hybrid planar lightwave circuit (PLC) of the transceiver TRx will be composed from a two parts - polymer optical waveguide including VHGT filter section and a optoelectronic microwave section.

The Hybrid Photonics Integrated Circuits with the Polymer Optical Waveguides

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper report about design of the hybrid photonics integrated circuits with the polymer optical waveguides.

Hybridní fotonické integrované obvody s planárními polymerními optickými vlnovody

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Článek popisuje návrh fotonických integrovaných obvodů s polymerními optickými vlnovody.

Optical Properties of Epoxy Novolak Resin Polymer Co-doped with Er3+ and Er3+/Yb3+ Ions

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper described optical properties of epoxy novolak resin polymer co-doped with Er3+ and Er3+/Yb3+ Ions.

Optické vlastnosti vrstev GaN s dotací Er3+ + Yb3+ iontů

Photoluminescence of Er3+ and Er3+/Yb3+ Doped Epoxy Novolak Resin

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper described photoluminescence of Er3+ and Er3+/Yb3+ doped epoxy novolak resin

Planar Lightwave Hybrid Integration Circuits

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper describes design of planar hybrid circuit based on planar lightwavw hybrid integration circuit.

Polymer Optical Planar Waveguides Doped by Erbium Ions

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper described polymer optical planar waveguides doped by erbium ions.

Properties of Er3+ and Dy3+ Implanted GaN Layers

Properties of the Epoxy Novolak Resin Optical Planar Waveguides

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper described properties of the epoxy novolak resin optical planar waveguides.

The hybrid photonic integrated circuits with the polymer optical waveguides

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper described designed of planar hybrid circuit with polymer optical waveguides.

Implantation of Er3+/Yb3+ Ions into GaN

  • Autoři: doc. Ing. Václav Prajzler, Ph.D., Špirková, J., doc. Ing. Vítězslav Jeřábek, CSc., Hüttel, I., Alves, E., Buchal, Ch., Oswald, J., Peřina, V., Boldyryeva, H., Zavadil, J.
  • Publikace: Proceedings of the WSEAS International Conference: 5th WSEAS Int.Conf. on MICROELECTRONICS, NANOELECTRONICS, OPTOELECTRONICS (MINO'06). Athens: WSEAS Press, 2006. p. 262-267. ISSN 1790-5117. ISBN 960-8457-42-4.
  • Rok: 2006

Implantation of Er3+/Yb3+ Ions into GaN

Microwave Optoelectronics Receiver Composed of P-I-N Photodiode and MMIC Amplifier

  • Autoři: doc. Ing. Vítězslav Jeřábek, CSc., Armas Arciniega, J., Hüttel, I.
  • Publikace: Proceedings of Workshop 2006. Praha: České vysoké učení technické v Praze, 2006. pp. 232-233. ISBN 80-01-03439-9.
  • Rok: 2006
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper report about microwave optoelectronics receiver composed of P-I-N photodiode and MMIC amplifier.

Microwave Optoelectronics Receiver with MMIC HBT Amplifier

  • Autoři: Armas Arciniega, J., doc. Ing. Vítězslav Jeřábek, CSc.,
  • Publikace: Proceedings of the WSEAS International Conference: 5th WSEAS Int.Conf. on MICROELECTRONICS, NANOELECTRONICS, OPTOELECTRONICS (MINO'06). Athens: WSEAS Press, 2006. p. 210-213. ISSN 1790-5117. ISBN 960-8457-42-4.
  • Rok: 2006
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper report about microwave optoelectronic receiver with MMIC HBT amplifier.

Microwave Optoelectronics Receiver with MMIC HBT Amplifier

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper report about microwave optoelectronics receiver with MMIC HBT Amplifier.

Microwave Optoelectronics Receiver with MMIC HBT Amplifier

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper report about microwave optoelectronic receiver with MMIC HBT amplifier.

Modeling and Simulation of an Optoelectronic Receiver

  • Autoři: doc. Ing. Vítězslav Jeřábek, CSc., Armas Arciniega, J.
  • Publikace: Book of Proceedings VRŠOV 2006. Brno: VUT v Brně, Fakulta elektrotechniky a komunikačních technologií, 2006. pp. 64-70. ISBN 80-214-3247-0.
  • Rok: 2006
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper report about modeling and simulation of an optoelectronic receiver.

New Technologies for Passive and Active Planar Structures on Carbon Base and Organic Materials for Active Structures for Integrated Optics

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper described new technologies for passive and active planar structures on carbon base and organic materials for active structures for integrated optics.

Optical Properties of Er3+ + Yb3+ Doped Gallium Nitride Layers

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper described properties of gallium nitride layers doped with Er3+ + Yb3+ ions.

Optical Properties of Er3+ + Yb3+ Doped Gallium Nitride Layers

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper described optical properties of Er3+ + Yb3+ doped gallium nitride layers.

Planar Lightwave Hybrid Integration Circuits

Planární fotonické hybridní integrované obvody

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Článek popisuje návrh fotonických integrovaných planárního hybridníh obvodů.

Polymethylmethacrylate Optical Planar Waveguides

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper described optical properties of polymethylmethacrylate optical planar waveguides.

Properties of Sputtered Carbon Layers Containing Erbium and Ytterbium Ions

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper described properties of sputtered carbon layers containing erbium and ytterbium ions.

Rare Earth Doped Gallium Nitride Layers for Photonics Applications

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper described properties of rare earth doped gallium nitride layers for photonics applications

Theoretical Description and Experiment to Prove the Bistability of the Semiconductor Laser Diode

  • Autoři: doc. Ing. Vítězslav Jeřábek, CSc., Huttel, I.
  • Publikace: Advances in Thin-Films Coatings for Optical Applications III. Bellingham: SPIE, 2006. pp. 62860L-1-62860L-11. ISSN 0277-786X. ISBN 0-8194-6365-5.
  • Rok: 2006
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper describe theoretical description and experiment to prove the bistability of the semiconductor laser diode.

Theoretical Description and Experiment to Prove the Bistability of the Semiconductor Laser Diode

Vědecko-Výzkumná a Pedagogická Činnost v Oblasti Optoelektroniky

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Článek opisuje vědecko-Výzkumnou a Pedagogickou činnost v oblasti optoelektroniky

Bistability of tha Laser Diode with a Multiple-Divided Contact Stripe

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper report about bistable laser diode with a multiple-divided contact stripe.

Bistable Laser Diode with a Multiple-Divided Contact Stripe

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper report about bistable laser diode with a multiple-divided contact stripe.

Vlastnosti bistabilní laserové diody s mnohonásobně děleným proužkovým kontaktem

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Článek popisuje vlastnosti bistabilní laserové diody s mnohonásobně děleným proužkovým kontaktem

Za stránku zodpovídá: Ing. Mgr. Radovan Suk