Laboratory of Telecommunications Systems

Democritus University of Thrace
Contact Person: Associate Professor Kyriakos E. Zoiros
Telephone: 0030 25410 79975


The Laboratory of Telecommunications Systems belongs to the Department of Electrical & Computer Engineering of the Democritus University of Thrace in Xanthi, Greece. Its research activities fall inτο three main categories, namely digital communications, communications networks and optical communications. In particular in the area of optical communications the conducted research focuses on all-optical signal processing and its applications, both in fundamental and system-oriented level, for the implementation of photonic networks. For this purpose the Laboratory is activating, and has gained extensive experience, on the study, simulation, design, optimization and implementation of conventional and quantum-dot (QD) semiconductor-optical amplifier (SOA)-assisted interferometric configurations, (QD) SOA-based photonic circuits and subsystems of enhanced functionality and (QD) SOAs as stand-alone amplification and modulation elements. Other research interests currently include microring resonators, microwaves photonics and free space optical communications. In these research fields the Laboratory has established bilateral collaborations with research groups from all over the world. The Laboratory has also developed facilities which comprise of state-of-the-art equipment for educational purposes. In this manner it offers to students the opportunity to become acquainted with cutting-edge telecommunications technologies, pursue their diploma thesis and become specialized, via postgraduate studies, in a wide range of research subjects.


People phone mail
Professor (& Director) Christos S. Koukourlis 0030 25410 79597
Ph.D. candidate Zoe V. Rizou 0030 25410 79975


  • D. Kastritsis, K.E. Zoiros and E. Dimitriadou, “Design of ultrafast all-optical pulsed-mode 2×2 crossbar switch using quantum-dot semiconductor optical amplifier-based Mach–Zehnder interferometer”, Journal of Computational Electronics (Springer), vol. 15, no. 3, pp.  1046-1063, 2016.
  • T. Engel. Z.V. Rizou, K.E. Zoiros and P. Morel, “Semiconductor optical amplifier direct modulation with double-stage birefringent fiber loop”, Applied Physics B: Lasers and Optics (Springer), vol. 122, no. 6, art. no. 158/1-10, 2016.
  • K.E. Zoiros, P. Morel and M. Hamze, “Performance improvement of directly modulated semiconductor optical amplifier with filter-assisted birefringent fiber loop”, Microwave & Optical Technology Letters (Wiley), vol. 57, no. 10, pp. 2247-2251, 2015.
  • Z.V. Rizou, K.E Zoiros, A. Hatziefremidis and M.J. Connelly, “Performance tolerance analysis of birefringent fiber loop for semiconductor optical amplifier pattern effect suppression”, Applied Physics B: Laser & Optics (Springer), vol. 119, no. 2, pp. 247-257, 2015.
  • D.K. Gayen, T. Chattopadhay and K.E. Zoiros, “All-optical D flip-flop using single quantum-dot semiconductor optical amplifier assisted Mach–Zehnder interferometer”, Journal of Computational Electronics (Springer), vol. 14, no. 1, pp. 129-138, 2015.
  • K.E. Zoiros and P. Morel, “Enhanced performance of semiconductor optical amplifier at high direct modulation speed with birefringent fiber loop”, AIP Advances, vol. 4, no. 7, art. no. 077107/1-7, 2014.
  • Z.V. Rizou, K.E. Zoiros and A. Hatziefremidis, “Semiconductor optical amplifier pattern effect suppression with passive single microring resonator-based notch filter”, Optics Communications (Elsevier), vol. 329, pp. 206-213, 2014.
  • A. Kotb and K.E. Zoiros, “1 Tb/s high quality factor NAND gate using quantum-dot semiconductor optical amplifiers in Mach–Zehnder interferometer”, Journal of Computational Electronics (Springer), vol. 13, no. 2, pp. 555-561, 2014
  • A. Kotb and K.E. Zoiros, “Performance of all-optical XOR gate based on two-photon absorption in semiconductor optical amplifier-assisted Mach–Zehnder interferometer with effect of amplified spontaneous emission”, Optical and Quantum Electronics (Springer), vol. 46, no. 7, pp. 935-944, 2014
  • A. Kotb and K.E. Zoiros, “On the design of all-optical gates based on quantum-dot semiconductor optical amplifier with effect of amplified spontaneous emission”, Optical and Quantum Electronics (Springer), vol. 46, no. 8, pp. 977-989, 2014.


Vasilissis Sofias, Xanthi, Greece

Research Field