prof. Ing. Stanislav Zvánovec, Ph.D.

Proposal, design and validation of adaptive techniques within all optical wireless networks. Novel methods for fade mitigations adopted for Ad-hoc wireless infrastructures. http://www.elmag.org/cs/profile-main/32

In recent years, we have seen a growing interest on the potential deployment of the visible light communications (VLC), optical packet switching and fiber optical infrastructures for either optical communications or as parts of 4/5G networks. The main objective of this PhD topic will be in cooperation with international partners to merge all optical technologies towards complex all-optical topology and to define and develop new interfaces between particular technologies http://www.elmag.org/cs/profile-main/32 http://www.elmag.org/cs/profile-main/58

The development of novel optical fibers such as Microstructure Optical Fibers (MOFs) brings a new range of possible applications especially for sensing purposes either due to the changes in evanescent wave or via nonlinnear optics.The main objective of this topic will be in cooperation with international partners to develop new sensing technologies based on specialty optical fibers. T. Nemecek, M. Komanec, T. Martan, R. Ahmad, S. Zvanovec, Suspended-core microstructured fiber for refractometric detection of liquids, Applied Optics, vol. 54, no. 30, pp. 8899-8903, 2015. M. Komanec, T. Martan, T. Nemecek, S. Zvanovec, Multimode Fiber Tapers for Reproducible Refractometric Liquid Detection, Optical Engineering, vol. 54, no. 4, p. 047102.1-6, 2015.

Visible Light Communication (VLC) is a new technology with multiple functionalities, which is suitable for the future last-metre access networks. Most VLC systems have been using in- organic WPLEDs/RGBLEDs as the transmitters and Si PDs as the receivers due to several advantages: (i) high optical power output (transmitters) and (ii) reasonable bandwidths in the MHz region. On the other hand, such devices also have drawbacks such as scalability due to brittle crystals produced using epitaxial high vacuum processing methods (transmitters) and low responsivity in the visible range (receivers). Combine these disadvantages with the fact that organic LEDs like PLEDs and SMOLEDs are emerging as serious candidates for future lighting systems due to extremely low cost solution-based processing methods and high electrical efficiencies. The main objective of this topic will be in cooperation with international partners to develop new technologies for VLC communications based on OLEDs. Paul Anthony Haigh, Andrew Burton, Matej Komanec, Zabih Ghassemlooy, Stanislav Zvanovec, Organic Light Emitting Diodes Based VLC, chapter in Visible Light Communication Systems: theory, applications and future trends, ed. Luis Nero, Elsevier, 2016, in print P. Chvojka, S. Zvanovec, P.A. Haigh, Z. Ghassemlooy, Channel Characteristics of Visible Light Communications within the Dynamic Indoor Environment, IEEE Journal of Lightwave Technology, vol. 33, p. 1719 - 1725, 2015.

Optical sensors, both for detection of physical quantities and chemical compounds, represent rapidly developing area. Due to the enormous progress in the field there are still many issues opened for applied research such as ways for further increasing the sensitivity, selectivity, multichannel detection, calibration. This topic is focused on determination of new methodologies for detection of liquids and gases, development of new components for particular wavelength regions and analyses of optical sensors and infrastructures for or within harsh environment. http://www.elmag.org/cs/profile-main/32

With the standard optical telecommunication bands being heavily used and ever increasing congestion of radio frequency spectra, new emerging spectral bands are becoming of great interest. Furthermore in some areas it is necessary to extend fiber-optic connection by wireless transmissions. For example in the NIR region, wavelengths over 2000 nm are of particular interest thanks to the low attenuation of atmosphere or VIS region in connection with Visible Light Communications (VLC) has great potential to be interconnected with fiber and optical wireless communication (OWC) systems. The PhD research will be to focused on joint fiber and OWC networks. Optical signal behavior in VIS and NIR (above 2000 nm) regions will be studied with respect to atmospheric effects such as turbulence, fog and rain, both theoretically and experimentally. Furthermore new fiber fused components (couplers, lenses, collimators) will be developed to ease the system implementation using our cutting-edge CO2 fusion station. The successful candidate will join our research group and will work on a fully international level in cooperation with world-leading institutes in fiber and OWC based networks, such as the Northumbria University in Newcastle.

The development of novel optical fibers such as Microstructured Optical Fibers (MOFs) brings a new range of possible applications especially for communications and sensing for example due to the possibility of tailoring nonlinear or dispersion parameters. The main objective of this topic will be in cooperatión with international partners to design and evaluate new methodologies of supercontinuum generation in MOFs.

In recent years, we have seen a growing interest on the potential deployment of the visible light (VL) band (wavelengths of 390 to 750 nm) for optical wireless communications. This is due to recent advances in materials and solid-state technologies that have enabled the development of highly-efficient light emitting diodes (LEDs) which can be used for both illumination and data communication purposes. New generations of LEDs have attractive features such as a long life expectancy, high tolerance to humidity, lower power consumption and reduced heat dissipation. The main objective of this topic will be in cooperation with international partners to develop new technologies for VLC communications for indoor or vehicle to vehicle purposes. New methods for coverage and availability models. http://www.elmag.org/cs/profile-main/32