Keynote Speakers

Topic: Free Space Optical Systems Using All-Optical Relaying Schemes


The rapid increase in the number of internet and mobile users and high data-rate demanding applications has necessitated the quest for alternative wireless technologies in order to circumvent the spectrum congestion problem experience in radio frequency based system. Free space optical (FSO) communications is one of the proposed viable solutions,which offers extremely high bandwidth,interference and license free,highly directional and narrow beam,and inherently security. However,one of the major drawbacks of this technology is its vulnerability to the atmospheric phenomena such as fog,rain,smoke,and turbulence. Within this context,relay-assisted FSO systems have received attention in order to extend the link span,and improve the link performance and availability under the influence of  turbulence,since they take advantage of independent underlying fading paths,hence benefiting from spatial diversity.

The talk will introduce performance analyses for amplify-and-forward (AF) and decode-and-forward (DF) parallel or serial relay-assisted FSO links. We will illustrate that relay-assisted transmission allows a significant improvement of BER in the turbulence and in the power margin by more than 20 dB when using one and two (serial) relays between the source and destination. The demonstration will be given based on our experiments where we investigated the performance of a dual-hop 10 Gbps FSO with turbulence using all-optical switching in the relay terminal. We as well compared the BER performance of a triple-hop AF relaying FSO link with both direct and dual-hop links. And extension was done by considering each hop experiencing different turbulence regimes. Finally we will provide our recent results from 100 Gbps DF relay assisted FSO system using 2R all-optical regenerator.
Along with the main topic,the presentation will provide overview of research topics solved by Wireless and fiber optics team ( from the Czech Technical University in Prague led by prof. Stanislav Zvanovec,like Visible Light Communications (VLC) and Radio over FSO and fiber infrastructures.

Prof. Stanislav Zvanovec received his M.Sc. and Ph.D. degrees from the Faculty of Electrical Engineering,Czech Technical University (CTU) in Prague in 2002 and 2006,respectively. To date,he works as a full professor and deputy head of the Department of Electromagnetic Field and chairperson of PhD branch at CTU. His current research interests include Free Space Optical and fiber optical systems,Visible Light Communications,OLED,RF over optics and electromagnetic wave propagation issues for millimeter wave band. He is the head of Free-space and fiber optics group at CTU ( Till 2014 he was a chair of the Joint MTT/AP/ED/EMC chapter of the IEEE Czechoslovakia Section and he is head of the Commission F „Wave Propagation and Remote Sensing“ of the Czech National URSI Committee. He leads research and participates within in the frame of international projects ESA PECS no. 98069,ESA 4000105298/12/NL/CLP,ACE 2,EU COST projects IC1101 OPTICWISE (Optical Wireless Communications - An Emerging Technology) as vice chair of WG1,IC0802,IC0603,CA16220,Centre for quasi-optical.

Affiliation: Czech Technical University in Prague

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Title of the talk: Visible Light Communications Channel Emulators Design with FPGAs


Channel emulators are useful and very expensive pieces of equipment needed for the qualifications of telecommunication equipment,such as smartphones. A channel emulator is a device able to emulate in real time specific conditions of the communication channels. These are usually part of high end laboratories related to qualification and certification. In what concerns radio communicating devices there is a wide range of channel emulators available. In what concerns visible light communications (VLC),there is a very limited offer of such equipment. This is in part due to the limited number of electronics devices involving VLC. This scenario is however likely to change in the near future,given that VLC has been considered one of the last mile technologies with great potential in 5G and beyond 5G network scenarios. As such,the need of certification and qualification equipment will become prominent. This talk will overview the specification and design considerations of a channel emulator suitable for VLC systems. The emulator is designed with FPGAs (Field Programmable Gate Arrays),allowing the possibility of reconfiguration and portability.


Luis Nero Alves IEEE member since 2003. Graduated in 1996 and received his MSc degree in 2000,both in Electronics and Telecommunication Engineering from the University of Aveiro. Obtained the PhD degree in Electrical Engineering from the University of Aveiro in 2008. His expertise is on integrated circuit design for optical wireless applications. Since 2008 he has been the lead researcher from the Integrated Circuits group at Instituto de Telecomunicações,Aveiro. His current research interest are associated to the design and performance analysis of optical wireless communication systems,with special flavor in visible light communications. Other research topics include materials and devices for IoT sensing devices. He has authored and coauthored several research articles in these fields. Luis Nero Alves has participated/coordinated several research projects in the fields of optical wireless communications and sensing devices (with both national – FCT/VIDAS,FCT/EECCO,IT/VLCLighting - and international – EU-CIP/LITES,EU-FP7/RTMGear,EU-COST/OPTICWISE,EU-COST/MEMOCIS,EU-MSCA/VisIoN). Luis Nero Alves has also served in the technical program committee of several international conferences on the field of optical wireless communications. He has also served as reviewer for several journals in Optical communications,amongst which,



1-Department of Electronics Telecommunications and Informatics,University of Aveiro,Aveiro Portugal.

2-Instituto de Telecomunicações,Aveiro,Portugal.