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Digital optical feeder links system for broadband geostationary satellite

: Poulenard, S.; Mege, A.; Fuchs, C.; Perlot, N.; Riedi, J.; Perdigues, J.


Hemmati, H. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Free-Space Laser Communication and Atmospheric Propagation XXIX : 30 January-1 February 2017, San Francisco, California, United States
Bellingham, WA: SPIE, 2017 (Proceedings of SPIE 10096)
ISBN: 978-1-5106-0633-3
ISBN: 978-1-5106-0634-0
Paper 1009614, 8 S.
Conference "Free-Space Laser Communication and Atmospheric Propagation" <29, 2017, San Francisco/Calif.>
Fraunhofer HHI ()

An optical link based on a multiplex of wavelengths at 1.55 mu m is foreseen to be a valuable solution for the feeder link of the next generation of high-throughput geostationary satellite. The main satellite operator specifications for such link are an availability of 99.9% over the year, a capacity around 500Gbit/s and to be bent-pipe. Optical ground station networks connected to Terabit/s terrestrial fibers are proposed. The availability of the optical feeder link is simulated over 5 years based on a state-of-the-art cloud mask data bank and an atmospheric turbulence strength model. Yearly and seasonal optical feeder link availabilities are derived and discussed. On-ground and on-board terminals are designed to be compliant with 10Gbit/s per optical channel data rate taking into account adaptive optic systems to mitigate the impact of atmospheric turbulences on single-mode optical fiber receivers. The forward and return transmission chains, concept and implementation, are described. These are based on a digital transparent on-off keying optical link with digitalization of the DVB-S2 and DVB-RCS signals prior to the transmission, and a forward error correcting code. In addition, the satellite architecture is described taking into account optical and radiofrequency payloads as well as their interfaces.