Mr. Pasha Bekhrad Profile

Pasha Bekhrad

at Technische Univ Graz

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Proceedings Article | 21 May 2018 Presentation + Paper

Design of an evaluation breadboard with SNSPD for testing various deep space optical communication applications

Hristo Ivanov, Sander Dorenbos, Erich Leitgeb, Gert Freiberger, Pasha Bekhrad

Proceedings Volume 10674, 1067415 (2018) https://doi.org/10.1117/12.2307388

KEYWORDS: Free space optics, Signal attenuation, Turbulence, Single photon, Single photon detectors, Clouds

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Optical Wireless Communication (OWC) systems rapidly increase their importance in very long-distance deep space communication scenarios. However, the high performance requirements of deep space OWC systems demand preliminary experiments which are unmanageable in real conditions. Regarding this issue, an innovative approach for testing deep space optical communication links in controlled laboratory environment is developed. The proposed testbed is based on fibre optics technology and combines various modules which represent a real deep space OWC link. Similar to already demonstrated deep space missions, the implemented optical receiver is Superconducting Nanowire Single- Photon Detector (SNSPD) characterized with single photon sensitivity and high detection efficiency. Consequently, in this paper an authentic deep space Poisson channel is emulated and examined. The given theoretical description of the Poisson process is supported by real SNSPD measurements in terms of high efficient single photon detection. The provided measured graphs clearly show the operation of SNSPD. In addition, a variable optical attenuator (VOA) is applied as a main device emulating the tropospheric part of a deep space optical Poisson channel characterized predominantly by Mie scattering (fog and clouds) and turbulence effects. This OWC channel emulator also contains self-developed software and attenuator control unit based on external Digital Analog Converter (DAC). Moreover, the response time parameter of channel emulator is examined in detail. Two different times in terms of reaching the lowest and the highest allowed attenuation are measured and shown. Finally, the developed channel emulator is tested and evaluated under real attenuation data. The experimental results show that the proposed method can evaluate various deep space optical scenarios.

Proceedings Article | 17 May 2018 Paper

Benefits of visible light communication in car-to-car communication

P. Bekhrad, E. Leitgeb, H. Ivanov

Proceedings Volume 10683, 106833A (2018) https://doi.org/10.1117/12.2307524

KEYWORDS: Modulation, Telecommunications, Receivers, Visible radiation, Light emitting diodes, RF communications, Transmitters, Standards development, RGB color model, Signal to noise ratio

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Visible light communication (VLC) has been extensively studied for car-to-car (C2C) communication due to its inherent benefits. It is the idea of using light-emitting diodes for both illumination and data communications. The main motivations are longer lifetime of high-brightness light emitting diodes (LED) and growing popularity of the solid state of lighting sources compared to other sources of artificial light. These two features have made a whole range of developing applications such as C2C communication since the level of reliability and power efficiency offered by LED are excellent compared to the traditional incandescent light sources used for lightning. Car industry and automobile lighting market are more and more motivated also to use Laser diodes instead of LED because of higher intensity (Power). Fiber Laser and Glass Photonics could be the next generation components for carto-car VLC. This paper presents the main features of physical layer for VLC based on the IEEE 802.15.7 standard including useful Modulations, Forward Error Correction Coding for single light source also a comparison to wireless RF-Technology and different weather influences are considered. These aspects would also be of main interest for safety, availability and security for autonomous driving in the future applications

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