|The optical research team engages in fibre optics, optical sensing, fibre lasers, optical beam outdoor and indoor propagation with respect to atmospheric influence on free-space optic (FSO) links and last but not least in visible light communication (VLC). Currently, our scientific effort is focused on fundamental research as well as on cooperation with industry in the field of applied research.|
MEMBERS OF THE GROUP
Coordinates activities of the team in the fields of free-space optics, visible light communications, radio over optics and optical fiber systems and sensors.
Leads the research and development in the field of specialty optical fibers. Focuses on hollow-core fibers, fiber characterization, fiber-optic sensors and fiber interconnection technology.
Focuses on microwave photonics and optical fiber and free-space optics systems.
Focuses on Visible Light Communication based Internet of Things.
Focuses on advanced fiber sensors for gas and liquid detection.
Deals with LTE transfer through optical infrastructures (both fibre and FSO/VLC).
Focuses on mitigation of transmission impairments in high bit-rate millimetre-wave radio-over-fibre and FSO systems for 5G networks.
Engages in fibre optics and microwave techniques.
Focuses on the supercontinuum generation in microstructured optical fibres.
Works on hollow-core optical fibres for radio-over-fibre systems and interferometry.
Is focused on visible light communications using organic LEDs (OLEDs).
Focuses on hollow-core optical fibres, mode-field adapters and interferometers.
|Carlos Guerra Yánez
Specializes in visible light communication and free-space optics for short to medium ranges
Other team members:
Michael Písařík (new technological approaches and waveguide optics and with passive nonlinear optical components).
Jan Spáčil (radio over fiber, microwave photonics, driving electronics).
Petr Dvořák (focuses on measurement methods in optical systems and microwave radiometry).
Norhanis Aida Mohd Nor (diversity techniques for free-space optical networks (Ph.D. student of Northumbria University, supervisor prof. Ghasemlooy, co-supervisor prof. Zvanovec)).
Elizabeth Eso (multi-hop vehicular visible light communications, (Ph.D. student of Northumbria University, supervisor prof. Ghasemlooy, co-supervisor prof. Zvanovec)).
Xicong Li (extending the effective VLC system bandwidth using equalizers (Ph.D. student of Northumbria University, supervisor prof. Ghasemlooy, co-supervisor prof. Zvanovec)).
Redwan Ahmad (microstructured optical fibres).
Klára Eöllősová (LEDs, illuminating fibers, coupling methods, optical camera communication)
Xicong Li — Northumbria University 2020
Nithin Mohan — Northumbria University 2019
Luis Vallejo — Universitat Politecnica de Valencia 2019, 2021
Fatemeh Fataholmanan Najafabadi — Isfahan University of Technology 2019
Vicente Matus — Universidad de Las Palmas de Gran Canaria 2019 + 2020
Pooria Tabeshmehr — University of Tehran 2019
Andrew Burton — Northumbria University 2018
Oussama Haddad — Ecole Centrale Marseille 2018 + 2019
Patricia Chavez-Burbano — Universidad de Las Palmas de Gran Canaria 2018
Hoa Le Minh — Northumbria University 2018
Meng Ding — Southampton University 2018
Richa Priyadarshani — Indian Institute of Technology Delhi 2018
Paul Anthony Haigh — University of Bristol 2014 + University College London 2018
Amalia Nallely Castro Martínez — Universidad Nacional Autónoma de México 2015
Hassan K. Bakir Al-Musawi — Northumbria University 2015
Tamas Cseh — Budapest University of Technology and Economics 2015
Svetlana Korsakova — Saratov State University 2015
Mojtaba Mansour Abadi — Northumbria University 2014
Hatef Nouri — Ozyegin University 2014
Joaquin Perez — Northumbria University 2013
Speciality Optical Fibers
+ anti-resonant fibres, hollow-core photonic bandgap fibres
With the invention of photonic crystal fibres (PCFs, or also denoted as microstructured optical fibres, MOFs) in 1996, a new field of research opened for optical fibres as for telecommunications (wavelengths 1260 – 1620 nm) the conventional silica single-mode fibre was already a mastered technology. PCFs allow vast opportunities of parameter design by modification of their inner air-hole structure, such as the chromatic dispersion, attenuation, single-mode regime, nonlinearity and many more. Furthermore, with the advances in glass processing, non-silica glasses (fluoride, lead-silicate, chalcogenide, etc.) can be exploited to move deeper into the near and mid-infrared region. In the past few years, hollow-core fibres, as the masterpiece of PCFs, have been prepared with reasonably low attenuation enabling cutting-edge applications.
At the moment the research of our team is mainly focused on hollow-core photonic bandgap fibres (HC-PBGFs) and anti-resonant fibres (ARFs), where both fibre types guide light in a hollow air-core. Hollow-core fibres offer many advantages over conventional solid-core fibres due to the strongly reduced interaction of the guided light with the glass material. Examples of such benefits are the extremely low fibre non-linearity, low and stable signal latency, the possibility to construct long-length gas cells.
We concentrate on the efficient light coupling from standard solid-core fibres into hollow-core fibres. We have designed and developed the interconnection using a world-unique approach. We propose anti-reflective or highly reflective layers with respect to state-of-the-art research applications. All this is made on an international level in cooperation with one of the world-leading institutes in PCFs, the University of Southampton.
Our background includes experience with PCF characterization, fibre tapering for sensor purposes, rare-earth doped amplifiers and lasers. Furthermore, we have a brand new glass fusion station, the top-shelf Fujikura/AFL LZM-100 giving us countless possibilities of research extensions.
+ detection of liquids, displacement measurement, fiber-optic gyroscope
Fibre-optic sensors (FOS) can be found almost anywhere, preventing disasters, improving healthcare, analyzing food quality, enhancing performance in industry and helping to reveal fundamental natural phenomena. By using optical fibres, physical quantities such as temperature, pressure, force, flow, rotation, position and radiation can be measured. Moreover, electromagnetic field can be analyzed in terms of magnetic fields having effects on polarization in the optical fibre.
The most successful representatives are fibre Bragg grating (FBG) sensors, which monitor buildings, bridges and other constructions for possible cracks. Also, also fibre-optic gyroscopes (FOG), which are the most precise gyroscopes used especially for aerial and space inertial navigation.
In our team, we focus on three kinds of FOS: i) We investigate refractometric sensors for detection of liquid quality, either by refractive index or by spectroscopic analysis. We developed fibre tapers with enhanced evanescent-wave overlap, designed and prepared photonic crystal fibres for sensing and also experimented with chalcogenide multimode sensors for MIR spectroscopy; ii) We are involved in the research of precise displacement measurement using Fabry-Perot interferometers (FPI). Furthermore, we now focus on FPI in combination with hollow-core fibres (see the section above); iii) Last but not least we have been involved in FOG development, both in hardware and software.
Our background includes experience with fibre-optic sensor design, spectroscopy, fibre-optic gyroscopes, fibre tapering and extremely precise interferometers. Furthermore, we have a brand new glass fusion station, the top-shelf Fujikura/AFL LZM-100 giving us countless possibilities of research extensions and sensor preparation.
+ 5G systems, radio-over-fibre
Microwave photonics combines multidisciplinary fields of optical, microwave and electrical engineering. Therefore, it must cover the spectrum area from very low frequencies (below 1 kHz) up to hundreds of THz associated with the optical domain. In our team, we mainly focus on characterisation, testing and optimisation of optical components for utilisation in new wireless networks operating in high-frequency bands. Also, overall systems as radio over fibre (RoF) and radio over free-space optics (RoFSO) are tested to maximise transmission capacity and flexibility under different conditions. We have several running projects and international collaboration on microwave photonics with universities in Southampton and Valencia.
Free-space Optics Systems
+ diversity techniques, relay links, thermal and atmospheric turbulence
Free-space optics (FSO) introduces a line-of-sight optical wireless communication (OWC) technology which offers many advantages for modern communication infrastructures including large frequency bandwidth and substantially high available data rates, immunity to electromagnetic interference, license-free spectrum, higher security of transmission due to narrow optical beams etc. Nevertheless, many factors may affect an optical beam causing fluctuations of the received optical signal like a scattering of small particles, beam wandering and scintillation caused by thermal turbulence or atmospheric turbulence, which is the major factor of bit error rate performance degradation.
In our research, we exploit several wireless optical links in the CTU campus connected into a simple network and as well our dedicated turbulent chamber and OWC laboratory. We characterize atmospheric parameters and from that develop behavioural models of atmospheric turbulence. The error performance of the FSO links under turbulences can be significantly improved using diversity techniques, e.g. by employing multiple transmit or receive apertures or by utilization of several relay FSO links (here, we experimentally test both amplify and forward and regeneration and forward techniques).
Our international collaborators include academic research groups from Northumbria University, KU Leuven, Indian Institute of Technology Delhi and other teams.
Visible Light Communications
+ digital signal processing, optical camera communications, organic LEDs
In recent years, visible light communications (VLC) has rapidly gained interest among research communities worldwide. It is an emerging technology for future high capacity communication links utilizing the visible range of the electromagnetic spectrum (~370-780 nm), which is not only licensed free but free from spectral overcrowding unlike radio frequencies (RF). VLC utilizes light-emitting diodes (LEDs), modulating them at high speeds that are much faster than the human eye can detect, to simultaneously provide data transmission and room illumination. A major challenge in VLC is the LED modulation bandwidths, which are limited to a few MHz.
Recently, we have been focused mainly on the signal processing techniques enabling effective utilization of the transmission bandwidth in VLC. We have adopted multi-band carrier-less amplitude and phase (m-CAP) modulation in VLC domain, originally developed for optical fibre networks, and proposed and verified a number of techniques improving m-CAP performance in terms of bit rate, spectral efficiencies, and computational complexity. Among inorganic LEDs, organic-based LEDs (OLEDs) represent a possible solution for solid-state lighting applications due to their advantage such as ultra-low costs, mechanical flexibility, and large photoactive areas. However, their modulation bandwidth is limited to a few hundreds of kHz introducing significant bottle-neck in VLC networks. Thus, we are also focused on equalization schemes that enhance VLC systems performance and are necessary for designing OLED based networks.
We have many international academic collaborations with world-leading research groups in the field of VLC, including Northumbria University and Newcastle University.
Laboratory measurement of a VLC system.
Optical camera communication (OCC) can be considered a convenient and versatile short-range communication technology within the framework of optical wireless communications. OCC is a pragmatic version of VLC based on a smart device camera that allows easier implementation of various services in smart devices. OCC can be a more favourable solution, especially in indoor environments, due to one compelling fact that the OCC is based on a camera as the receiver and nearly six billion smartphones fitted with cameras are available worldwide.
We have addressed the issue of longer processing time in OCC using neural network-based processing for applications such as motion detection over the existing OCC links. The motion detection is considered as an add-on functionality in OCC to control various smart devices in smart home environments. Recently we have focused on OCC System for Internet of Things based on OLEDs. Performance of outdoor OCC links using focusing and defocusing techniques for applications such as vehicle-to-vehicle communications is also performed in an outdoor environment. Currently, we are working on OCC link analysis to develop multiuser environment as well as to provide mobility in indoor OCC scenarios. Collaborative work with international academic institutes working in the same field gives a way out to interesting results for the ongoing research. Our international collaborators include academic research groups from the University of Las Palmas de Gran Canaria and Northumbria University.
- H2020 Marie Skłodowska-Curie Innovative Training Network (ITN) project “VisIoN” (Visible light based Interoperability and Networking), https://www.vision-itn.eu.
- COST Project CA16620 European Network for High Performance Integrated Microwave Photonics.
- COST project MP1401 Advanced Fibre Laser and Coherent Source as Tools for Society, Manufacturing and Lifescience.
- Combined Radio Frequency and Visible Light Bands for Device-to-Device communication (in cooperation with 5Gmobile (5GM) research lab), GACR grant 17-17538S.
- High-speed optical source modules for data centers, (in cooperation with Argotech a.s.), Ministry of industry and trade project MPO TRIO FV40089
- Analyzer of modal structure in optical components (in cooperation with PROFiber Networking CZ s.r.o.), Ministry of industry and trade project MPO TRIO FV10519.
- Radio-optical transmission terminal for 5G networks, MPO grant TRIO FV30427.
- High-precision fiber collimator arrays MPO grant TRIO FV30136.
- TACR – Centre of competence TE02000202 Advanced sensors and sensor data processing methods (our team – leading Working Package 6), external academic participants from University of West Bohemia, Brno University of Technology and industrial participants from AZD Praha, Honeywell International s.r.o., SQS Fiber optics, LESIKAR, a.s. and Safibra.
- MEMS sensors with optical scanning, TACR project TH03010205 with SQS Fiber optics, Honeywell International s.r.o. and VUT Brno.
- Development of optical sensors and systems and microwave biomedical technologies, ČVUT projekt SGS17/182/OHK3/3T/13.
Selected finished projects:
- COST project IC1101 Optical Wireless Communications – An Emerging Technology, OPTICWISE, http://www.cost.eu/domains_actions/ict/Actions/IC1101
- Wideband Optical Source Based on Soft-glass Fibers (in cooperation with SQS, fiber optics a.s), TACR grant TA04010220
- Fiber optic detection of liquids (in cooperation with SQS, fiber optics a.s), TACR grant TA03010060
- Optical packet switch (in cooperation with SQS, fiber optics a.s, IFE AV ČR), TAČR grant TA01011105
- Research of Ambient Influences on Novel Broadband Optical Wireless Systems – RAINBOWS, MŠMT COST_CZ project LD12058
- Centre for quasi-optical systems and terahertz spectroscopy, project LC06071 (with VŠCHT and VUT)
- Quadrupole Interactions as a Powerful Tool for the Conformational and Structural Analyses of Biochemically and Astrophysically Important Molecules (with VŠCHT), GAČR project GAP206/10/2182
- The Influence of the Atmosphere on Electromagnetic Wave Propagation for Broadband Stratospheric Links, GAČR project GP102/08/P346
SELECTED RESEARCH PARTNERS
- J. Bohata, M. Komanec, J. Spacil, R. Slavík, and S. Zvanovec, “Transmitters for Combined Radio over a Fiber and Outdoor Millimeter-wave System at 25 GHz“, in IEEE Photonics Journal, vol.12, no. 3, pp. 1-14, 2020.
- P. Pesek, P. A. Haigh, O. I. Younus, P. Chvojka, Z. Ghassemlooy, and S. Zvanovec, “An Experimental Multi-User VLC System using Non-Orthogonal Multi-Band CAP Modulation“, in Optics Express, vol. 28, no. 12, pp. 18241-18250, 2020.
- P. Chvojka, A. Burton, P. Pesek, X. Li, Z. Ghassemlooy, S. Zvanovec, and P. A. Haigh, “Visible Light Communications: Increasing Data Rates with Polarisation Division Multiplexing“, in Optics Letters, vol. 45, no. 11, pp. 2977-2980, 2020.
- O. I. Younus, N. B. Hassan, Z. Ghassemlooy, P. A. Haigh, S. Zvanovec, L. N. Alves, and H.L. Minh, “Data Rate Enhancement in Optical Camera Communications using an Artificial Neural Network Equaliser“, in IEEE Access, vol. 8, pp. 42656-42665, 2020.
- X. Li, Z. Ghassemlooy, S. Zvanovec, R. Perez-Jimenez, and P. A. Haigh, “Should Analogue Pre-equalisers be Avoided in VLC Systems?“, in IEEE Photonics Journal, vol. 12, no. 2, pp. 1-14, 2020.
- L. Vallejo, D.-N. Nguyen, J. Bohata, B. Ortega, and S. Zvanovec, “M-QAM signals transmission at the photonically generated K-band over thermal-induced turbulent FSO links with different turbulence distributions“, in Applied Optics, vol. 59, no. 16, pp. 4997-5005, 2020.
- M.Ding, M. Komanec, D. Suslov, D. Dousek, S. Zvanovec, E.Numkam Fokoua, T.D. Bradley, F. Poletti, D.J. Richardson, and R. Slavik, “Long-Length and Thermally Stable High-Finesse Fabry-Perot Interferometers Made of Hollow Core Optical Fiber“, in Journal of Lightwave Technology, vol. 38, no.8, pp. 2423-2427, 2020.
- D. Suslov, M. Komanec, T. Nemecek, J. Bohata, and S. Zvanovec, “Exact modeling of photonic crystal fibers for determination of fundamental properties“, in Optical Fiber Technology, vol. 56, pp. 1-6, 2020.
- E. Eso, S. Teli, N. B. Hassan, S. Vitek, Z. Ghassemlooy, and S. Zvanovec, “A 400 m Rolling Shutter based Optical Camera Communications Link“, in Optics Letters, vol. 45, issue 5, pp. 1059-1062, 2020.
- R. Priyadarshani, A. Jaiswal, M. R. Bhatnagar, J. Bohata, S. Zvanovec and Z. Ghassemlooy, “Impact of Channel Correlation on Different Performance Metrices of OSSK-Based FSO System“, in IEEE Transactions on Wireless Communications, vol.19, no. 3, pp. 1593-1609, 2020.
- D. Suslov, M. Komanec, T. Nemecek, J. Bohata and S. Zvanovec, “Exact modeling of photonic crystal fibers for determination of fundamental properties“, in Optical Fiber Technology, vol. 56, pp. 1-6, 2020.
- L. Vallejo, M. Komanec, B. Ortega, J. Bohata, D.-N. Nguyen, S. Zvanovec and V. Almenar, “Impact of thermal-induced turbulent distribution along FSO link on transmission of photonically generated mmW signals in the frequency range 26-40 GHz“, in IEEE Photonics Journal, vol. 12, no. 1, pp. 1-10, 2020
- D.-N. Nguyen, J. Bohata, M. Komanec, S. Zvanovec, B. Ortega and Z. Ghassemlooy, “Seamless 25 GHz Transmission of LTE 4/16/64 QAM Signals over Hybrid SMF/FSO and Wireless Link“, in IEEE Journal of Lightwave Technology, vol. 37, issue 24, pp. 6040-6047, 2019.
- M. Najla, P. Mach, Z. Becvar, P. Chvojka and S. Zvanovec, “Efficient Exploitation of Radio Frequency and Visible Light Communication Bands for D2D in Mobile Networks“, in IEEE Acess, vol. 7, pp. 168922-168933, 2019.
- S. R. Teli, S. Zvanovec and Z. Ghassemlooy, “Performance evaluation of neural network assisted motion detection schemes implemented within indoor optical camera based communications“, in Optics Express, vol. 27, issue 17, pp. 24082-24092, 2019.
- N. A. M. Nor, M. Komanec, J. Bohata, Z. Ghassemlooy, M. R. Bhatnagar and S. Zvanovec, “Experimental All-Optical Relay-Assisted FSO Link with a Regeneration and Forward Scheme for Ultra-Short Pulse Transmission“, in Optics Express, vol. 27, no. 16, pp. 22127-22137, 2019.
- A. Burton, P.A. Haigh, P. Chvojka, Z. Ghassemlooy and S. Zvanovec, “Filter-less WDM for Visible Light Communications using Coloured PAM“, in Optics Letters, vol. 44, issue. 19, pp. 4849-4852, 2019.
- P. Pesek, S. Zvanovec, P. Chvojka, Z. Ghassemlooy, N. A. M. Nor and P. Tabeshmehr, “Experimental Validation of an Indoor Relay-assisted Visible Light Communications for the Last Meter Access Network“, in Optics Communications, vol. 451, pp. 319-322, 2019.
- N. A. M. Nor, Z. Ghassemlooy, S. Zvanovec, M. A. Khalighi, M. R. Bhatnagar, J. Bohata and M. Komanec, “Experimental Analysis of a Triple-Hop Relay-Assisted FSO System with Turbulence“, in Optical Switching and Networking, vol. 33, pp. 194-198, 2019.
- P. Chavez-Burbano, S. Vitek, S. R. Teli, V. Guerra, J. Rabadan, R. Perez-Jimenez and S. Zvanovec, “Optical Camera Communication System for Internet of Things based on Organic Light Emitting Diodes“, in Electronics Letters, vol. 55, no. 6, pp. 334-336, 2019.
- N. Bani Hassan, Z. Ghassemlooy, S. Zvanovec, M. Biagi, A. M. Vegni, M. Zhang and P. Luo, “Non-Line-of-Sight MIMO Space-Time Division Multiplexing Visible Light Optical Camera Communications“, in Journal of Lightwave Technology, vol. 37, no. 10, pp. 2409-2417, 2019.
- P. A. Haigh, P. Chvojka, Z. Ghassemlooy, S. Zvanovec and I. Darwazeh, “Visible Light Communications: Multi-band Super-Nyquist CAP Modulation“, in Optics Express, vol. 27, no. 6, pp. 8912-8919, 2019.
- M. Komanec, D. Suslov, S. Zvanovec, Y. Chen, T. Bradley, S. R. Sandoghchi, E. R. Numkam Fokoua, G. T. Jasion, M. N. Petrovich, F. Poletti, D. J. Richardson and R. Slavik, “Low-Loss and Low-Back-Reflection Hollow-Core to Standard Fiber Interconnection“, in IEEE Photonics Technology Letters, vol. 31, no. 10, pp. 723-72, 2019
- M. Komanec, T. Nemecek, M. Vidner, T. Martan, F. Lahodny and S. Zvanovec, “Structurally-modified tapered optical fiber sensors for long-term detection of liquids“, in Optical Fiber Technology, vol. 47, pp. 187-191, 2019
- P. Pesek, S. Zvanovec, P. Chvojka and Z. Ghassemlooy, “Demonstration of m-CAP Hybrid FSO/VLC Link for the Last Mile and Last Meter Networks“, in IEEE Photonics Journal, vol. 11, no. 1, pp. 1-7, 2019.
- J. Bohata, M. Komanec, J. Spacil, Z. Ghassemlooy, S. Zvanovec and R. Slavik, “24 – 26 GHz Radio over Fiber and Free Space Optics for 5G Systems“, in Optics Letters, vol. 43, no. 5, pp. 1035-1038, 2018.
- P. Pesek, S. Zvanovec, P. Chvojka, Z. Ghassemlooy, M. R. Bhatnagar and P. Saxena, “Mobile User Connectivity in Relay-assisted Visible Light Communication”, in Sensors, vol. 18, pp. 1-16, 2018.
- P. Luo, M. Zhang, Z. Ghassemlooy, S. Zvanovec, S. Feng and P. Zhang, “Undersampled-based Modulation Schemes for Optical Camera Communications“, in IEEE Communications Magazine, vol. 56, no.2, pp. 204-212, 2018.
- P. A. Haigh, P. Chvojka, S. Zvanovec, Z. Ghassemlooy and I. Darwazeh, “Analysis of Nyquist Pulse Shapes for Carrier-less Amplitude and Phase Modulation in Visible Light Communications“, in Journal of Lightwave Technology, vol. 36, pp. 5023-5029, 2018.
- K. Werfli, P. Chvojka, Z. Ghassemlooy, N. B. Hassan, S. Zvanovec, A. Burton, P. A. Haigh and M. R. Bhatnagar, “Experimental Demonstration of High-Speed 4 × 4 Imaging Multi-CAP MIMO Visible Light Communications“, in Journal of Lightwave Technology, vol. 36., pp. 1944-1951, 2018.
- N. B. Hassan, Z. Ghassemlooy, S. Zvanovec, P. Luo and H. Le-Minh, “Non-Line-of-Sight Indoor 2 x N Indoor Optical Camera Communications“, in Applied Optics, vol. 57, no. 7, pp. 144-149, 2018.
- R. Priyadarshani, M. R. Bhatnagar, Z. Ghassemlooy and S. Zvanovec, “Outage Analysis of a SIMO FSO System over an Arbitrarily Correlated Μ-distributed Channel“, in IEEE Photonics Technology Letters, vol. 30, no. 2, pp. 141-144, 2018.
- R. Ahmad, M. Komanec, D. Suslov and S. Zvanovec, “Modified Octagonal Photonic Crystal Fiber for Residual Dispersion Compensation over Telecommunication Bands“, in Radioengineering, vol. 27, no. 1, pp. 10-15, 2018.
- M. M. Abadi, Z. Ghassemlooy, M. R. Bhatnagar, S. Zvanovec, M. A. Khalighi and M.P.J. Lavery, “Differential Signalling in Free-Space Optical Communication Systems“, in Applied Sciences, vol. 8, no. 6, pp. 872, 2018.
- T. Nemecek, M. Komanec, B. Nelsen, T. Martan, D. Suslov, P. Hartmann and S. Zvanovec, “Experimentally and Analytically Derived Generalized Model for the Detection of Liquids with Suspended-core Optical Fibers“, in Optical Fiber Technology, vol. 45, pp. 295-299, 2018.
- Z. Ghassemlooy, L. Nero Alves, S. Zvanovec and M. Ali Khalighi, Visible Light Communications: Theory and Applications, CRC Press, 2017.
- N. A. M. Nor, Z. Ghassemlooy, S. Zvanovec, M. A. Khalighi, M. R. Bhatnagar, J. Bohata, M. Komanec, Experimental Analysis of a Triple-Hop Relay-Assisted FSO System with Turbulence, Optical Switching and Networking, 2017.
- P. Chvojka, S. Vitek, S. Zvanovec, Z. Ghassemlooy, S. Rajbhandari, Analyses of Non-Line of Sight Visible Light Communications, Optical Engineering, vol. 56, no.11, pp. 116116-1 – 7, 2017.
- Z. Ghassemlooy, W. O. Popoola, X. Tang, S. Zvanovec, S. Rajbhandari, Visible Light Communications – A Review, IEEE E-Letter of Multimedia Communications Technical Committee (MMTC) – Frontiers, vol. 12, no. 3, pp. 6-13, 2017.
- P. Chvojka, K. Werfli, S. Zvanovec, P. A. Haigh, V. Hubata Vacek, P. Dvorak, P. Pesek, Z. Ghassemlooy , On the m-CAP Performance with Different Pulse Shaping Filters Parameters for Visible Light Communications , IEEE Photonics Journal, vol. 9, no. 5, 2017.
- J. Bohata, S. Zvanovec, M. Komanec, J. Jaros, Z. Ghassemlooy, Adaptation of Transmitting Signals over Joint Aged Optical Fiber and Free Space Optical Network Under Harsh Environments, Optik, vol. 151, pp. 7-17, 2017.
- R. Priyadarshani, M. R. Bhatnagar, Z. Ghassemlooy, S. Zvanovec, Effect of Correlation on BER Performance of FSO-MISO System with Repetition Coding over Gamma-Gamma Turbulence, Photonics journal, vol.9, issue 5, 7906215, 2017.
- E. Romanova, S. Korsakova, M. Komanec, T. Němeček, A. Velmuzhov, V. Shiryaev, Multimode Chalcogenide Fibers for Evanescent Wave Sensing in the Mid-IR, IEEE Journal of Selected Topics in Quantum Electronics, vol. 23, Issue 2, pp. 1-7, 2017.
- S. Vitek, J. Libich, P. Luo, S. Zvanovec, Z. Ghassemlooy, N. B. Hassan, Influence of Camera Setting on Vehicle-to-vehicle VLC Employing Undersampled Phase Shift On-off Keying, Radioengineering, vol. 24, no. 4, pp. 946 – 953, 2017.
- H. K. Al-Musawi, T. Cseh, J. Bohata, W. P. Ng, Z. Ghassemlooy, S. Zvanovec, E. Udvary, P. Pesek, 4G-LTE Signal Transmission for the Last-mile Access Network Using a Hybrid RoMMF-FSO System under Turbulence Effects, IEEE Journal of Lightwave Technology, vol. 33, Issue 17, pp.3758-3764, 2017
- T. Martan, T. Nemecek, M. Komanec, R. Ahmad, S. Zvanovec, Refractometric Detection of Liquids Using Tapered Optical Fiber and Suspended Core Microstructured Fiber: A Comparison of Methods, Applied Optics, vol. 56, Issue 13, pp. 1-9, 2017.
- J. Libich, J. Perez, S. Zvanovec, Z. Ghassemlooy, R. Nebuloni, C. Capsoni, Combined Effect of Turbulence and Urban Aerosol on Free Space Optical Links, Applied Optics, vol. 56, Issue 2, pp. 336-341, 2017.
- M. M. Abadi, Z. Ghassemlooy, S. Zvanovec, M. R. Bhatnagar, M. A. Khalighi, Y. Wu, Impact of Link Parameters and Channel Correlation on the Performance of FSO Systems with Differential Signalling Technique, Journal of Optical Communications and Networking, vol. 9, issue. 2, pp. 138-148, 2017.
- N. A. M. Nor, Z. Ghassemlooy, J. Bohata, P. Saxena, M. Komanec, S. Zvanovec, M. R. Bhatnagar, M. A. Khalighi, Experimental Investigation of All-Optical Relay-Assisted 10 Gbps FSO Link over the Atmospheric Turbulence Channel, IEEE Journal of Lightwave Technology, vol. 35, issue 1, pp. 45-53, 2017.
- J. Bohata, J. Jaros, S. Pisarik, S. Zvanovec, M. Komanec, Long-term PMD Evolution and Accelerated Aging in Old Optical Cables, IEEE Photonics Technology Letters, vol. 29, no. 5, pp.519-522, 2017.
- R. Ahmad, M. Komanec, S. Zvanovec, Circular Lattice Photonic Crystal Fiber for Mid-IR Supercontinuum Generation, IEEE Photonics Technology Letters, vol. 28, Issue 23, pp. 2736 – 2739, 2016.
- M. R. Bhatnagar, Z. Ghassemlooy, S. Zvanovec, M. A. Khalighi, M. M. Abadi, Quantized Feedback Based Differential Signaling for Free-Space Optical Communication System, IEEE Transactions on Communications, vol. 64, Issue 12, pp.5176 – 5188, 2016.
- J. Bohata, S. Zvanovec, P. Pesek, T. Korinek, M. Mansour Abadi, Z. Ghassemlooy, Experimental Verification of LTE Radio Transmissions over Dual-polarization Combined Fibre and FSO Optical Infrastructure, Applied Optics, vol. 55, Issue 8, pp. 2109-2116, 2016.
- A. N. Castro Martinez, M. Komanec, T. Nemecek, S. Zvanovec, S. Khotiaintsev, Fiber Optic Refractometric Sensors Using a Semi-ellipsoidal Sensing Element, Applied Optics, vol. 55, Issue 10, pp. 2574-2579, 2016.
- M. M. Abadi, Z. Ghassemlooy, M. Khalighi, S. Zvanovec, M. Bhatnagar, FSO Detection Using Differential Signaling in Correlated Channels Condition, Photonics Technology Letters, vol.28, no.1, pp.55-58, 2016.
- D. Wu, Z. Ghassemlooy, W. Zhong, M.A. Khalighi, H. L. Minh, Ch. Chen, S. Zvanovec, A.C. Boucouvalas, Effect of Optimal Lambertian Order for Cellular Indoor Optical Wireless Communication and Positioning Systems, Optical Engineering, vol. 55, no. 6, pp. 066114-1-8, 2016.
- M. M. Abadi, Z. Ghassemlooy, S. Zvanovec, D. Smith, M. R. Bhatnagar, Y. Wu, Dual Purpose Antenna for Hybrid Free Space Optics/RF Communication Systems, IEEE Journal of Lightwave Technology, vol. 34, no. 14, pp. 3432-3439, 2016.
- M. Pisarik, P. Peterka, J. Aubrecht, J. Cajzl, A. Benda, D. Mareš, F. Todorov, O. Podrazky, P. Honzatko, I. Kašík, Thulium-doped fibre broadband source for spectral region near 2 micrometers. Opto-Electronics Review. 2016, 24(4), 223-231. ISSN 1230-3402.
- 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.
- P. A. Haigh, A. Burton, K. Werfli, H. L. Minh, E. Bentley, P. Chvojka, W. O. Popoola, I. Papakonstantinou, S. Zvánovec, A Multi-CAP Visible Light Communications System with 4.85 b/s/Hz Spectral Efficiency, IEEE Journal on Selected Areas in Communications, vol. 33, no.9, p. 1771-1779, 2015.
- J. Bohata, S. Zvanovec, T. Korinek, M. Mansour Abadi, Z. Ghassemlooy, Characterization of Dual-polarization LTE Radio over a Free-space Optical Turbulence Channel, Applied Optics, vol. 54, no. 23, p. 7082-7087, 2015.
- P. A. Haigh, S. T. Le, S. Zvánovec, Z. Ghassemlooy, P. Luo, T. Xu, P. Chvojka, T. Kanesan, E. Giacoumidis, P. Canyelles-Pericas, H. L. Minh, W. O. Popoola, S. Rajbhandari, N.J. Doran, I. Papakonstantinou, I. Darwazeh, Multi-band Carrier-less Amplitude and Phase Modulation for Bandlimited Visible Light Communications Systems, IEEE Wireless Communications, vol. 22, no. 2, p. 2-9, 2015.
- 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.
- J. Libich, M. Komanec, P. Pesek, S. Zvánovec, W. O. Popoola, Z. Ghassemlooy, Experimental Verification of All-optical Dual Hop 10 Gbit/s FSO Link under Turbulence Regimes, Optics Letters, vol. 40, no. 3, p. 391-394, 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.
- S. Zvanovec, P. Chvojka, P. Haigh, Z. Ghassemlooy, Visible Light Communications towards 5G. Radioengineering, vol. 24, no. 1, p. 1-9, 2015.
- P. Koska, Y. Baravets, P. Peterka, J. Bohata, M. Pisarik, Mode-Field Adapter for Tapered-Fiber-Bundle Signal and Pump Combiners, Applied Optics, vol. 54, no. 4, p. 751-756, 2015.
- S. Rajbhandari, Z. Ghassemlooy, P. A. Haigh, T. Kanesan, , Experimental Error Performance of Modulation Schemes under a Controlled Laboratory Turbulence FSO Channel, IEEE Journal of Lightwave Technology, vol. 30, art. no. 1, p. 244-250, 2015.
- P. Dvorak, M. Mazanek, S. Zvanovec, Fire Emissivity Detection by Microwave Radiometer, IEEE Geoscience and Remote Sensing Letters, vol. 12, no. 11, p. 2306-2310, 2015.
- V.Weinzettl, G. Shukla, J. Ghosh, R. Melich, R. Panek, M. Tomes, M. Imrisek, D. Naydenkova, J. Varju, T. Pereira, R. Gomes, I. Abramovic, R. Jaspers, M. Pisarik, T. Odstrcil, G. Van Oost, High-resolution Spectroscopy Diagnostics for Measuring Impurity Ion Temperature and Velocity on the COMPASS Tokamak, Fusion Engineering and Design, Vol. 96, pp 1006–1011, 2015.
- R. Ahmad, M. Komanec, S. Zvanovec, Modified octagonal photonic crystal fiber for residual dispersion compensation over telecommunication bands, Optik, submitted…
- J. Perez, S. Zvanovec, Z. Ghassemlooy, W. O. Popoola, Experimental characterization and mitigation of turbulence induced signal fades within an ad-hoc FSO network, Optics Express, vol. 22, no. 3, p. 3208-3218, 2014.
- M. Pisarik, P. Peterka, S. Zvanovec, Y. Baravets,F. Todorov, I. Kasik, P. Honzatko, Fused fiber components for „eye-safe“ spectral region around 2 micrometers, Optical and Quantum Electronics, vol. 46, pp. 603-611, 2014.
- J. Bohata, M. Pisarik, S. Zvanovec, P. Peterka, Reliability of Aircraft Multimode Optical Networks, Optical Engineering, vol. 53, no. 9, 096102, 2014.
- M. Mudroch, S. Zvanovec, Artificial Neural Network Utilization for FSO Link Performance Estimation, Radioengineering, vol. 23, no. 1, p. 474-479, 2014.
- S. Zvanovec, J. Perez, Z. Ghassemlooy, S. Rajbhandari, J. Libich, Route diversity analyses for free-space optical wireless links within turbulent scenarios, Optics Express, vol. 21, Issue 6, pp. 7641-7650, 2013.
- P. Dvorak, M. Mazanek, S. Zvanovec, Short-term Prediction and Detection of Dynamic Atmospheric Phenomena by Microwave Radiometer. Radioengineering. 2012, vol. 21, no. 4, p. 1060-1066. ISSN 1210-2512.
- J. Libich, P. Dvorak, P. Piksa, S. Zvanovec, Correction of Thermal Deviations in Fabry-Perot Resonator Based Measurements of Specific Gases in MillimeterWave Bands. Radioengineering. 2012, vol. 21, no. 1, p. 459-463. ISSN 1210-2512.
- J. Libich, S. Zvanovec, Influences of Turbulences in Near Vicinity of Buildings on Free Space Optical Links, IET Microwaves, Antennas & Propagation, 2011, vol. 5 , issue 9, p. 1039 – 1044.
- M. Komanec, P. Honzatko, S. Zvanovec, Single-shot All-optical Sampling Oscilloscope Using a Polarization-maintaining Resonator for Pulse Replication, Microwave and Optical Technology Letters. 2010, vol. 52, no. 11, p. 2452-2456. ISSN 0895-2477.
Last update: 01-05-2020