Implementation and assessment of a non-line-of-sight network cluster operating at the UVC wavelength band

Nikos Raptis; George Pekridis; Konstantinos Krillakis; Konstantinos Panoliaskos; Eugenia Roditi; Dimitris Syvridis

doi:10.1117/12.2610004

4 March 2022 Implementation and assessment of a non-line-of-sight network cluster operating at the UVC wavelength band

Nikos Raptis, George Pekridis, Konstantinos Krillakis, Konstantinos Panoliaskos, Eugenia Roditi, Dimitris Syvridis

Proceedings Volume 11993, Free-Space Laser Communications XXXIV; 119930W (2022) https://doi.org/10.1117/12.2610004
Event: SPIE LASE, 2022, San Francisco, California, United States

Abstract

Non-Line-of-Sight (NLOS) optical communication systems have attracted a lot of interest the last few years due to their obvious advantages, such as no requirements for optical beam tracking, non-destructive impact of obstacles on performance etc. Utilization of optical carriers in the UV-C band offers additional advantages profiting from the strong optical scattering, very low optical background noise due to ozone absorption in the atmosphere and inherent security since the UV-C radiation is strongly attenuated with distance. So far, the main focus of the demonstrated experiments has been on point-to-point communication systems. In this paper, we report on the implementation and initial performance characteristics of a peer-to-peer network consisting of nodes interconnected through scattered UV-C light. At the transmissions part, each node consists of four properly spatially arranged groups, with four UV-C LEDs per group, emitting at 265 nm. Each LED group is adjusted at a certain elevation angle. Moreover, each node has three receivers based on Photomultiplier Tubes (PMΤs) including a UV-C bandpass optical filter in front of each PMT to further reduce the background noise due to the non-zero responsivity of each PMT in the UV-B band. The modulation scheme adopted in the experiments is the 4-PPM (Pulse Position Modulation). The bit rate at the physical layer is close to 7.80 kbit/s. In the link layer, the rules for communication and collisions avoidance between nodes are also set. The first results for 15 meters distance with focus on the physical layer show that the concept is realistic.

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Citation Download Citation

Nikos Raptis, George Pekridis, Konstantinos Krillakis, Konstantinos Panoliaskos, Eugenia Roditi, and Dimitris Syvridis "Implementation and assessment of a non-line-of-sight network cluster operating at the UVC wavelength band", Proc. SPIE 11993, Free-Space Laser Communications XXXIV, 119930W (4 March 2022); https://doi.org/10.1117/12.2610004

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