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Optical ground station optimization for future optical geostationary satellite feeder uplinks

Camboulives, Adrien-Richard and Velluet, Marie-Thérèse and Poulenard, Sylvain and Saint-Antonin, Laurent and Michau, Vincent Optical ground station optimization for future optical geostationary satellite feeder uplinks. (2017) In: Photonics West 2017, 28 January 2017 - 2 February 2017 (San Francisco, United States).

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Official URL: http://dx.doi.org/10.1117/12.2249994

Abstract

An optical link based on a multiplex of wavelengths at 1.55µm is foreseen to be a valuable alternative to the conventional radio-frequencies for the feeder link of the next-generation of high throughput geostationary satellite. Considering the limited power of lasers envisioned for feeder links, the beam divergence has to be dramatically reduced. Consequently, the beam pointing becomes a key issue. During its propagation between the ground station and a geostationary satellite, the optical beam is deflected (beam wandering), and possibly distorted (beam spreading), by atmospheric turbulence. It induces strong fluctuations of the detected telecom signal, thus increasing the bit error rate (BER). A steering mirror using a measurement from a beam coming from the satellite is used to pre-compensate the deflection. Because of the point-ahead angle between the downlink and the uplink, the turbulence effects experienced by both beams are slightly different, inducing an error in the correction. This error is characterized as a function of the turbulence characteristics as well as of the terminal characteristics, such as the servo-loop bandwidth or the beam diameter, and is included in the link budget. From this result, it is possible to predict intensity fluctuations detected by the satellite, both statistically (mean intensity, scintillation index, probability of fade, etc.) and temporally (power spectral densities, time series). The final objective is to optimize the different parameters of an optical ground station capable of mitigating the impact of atmospheric turbulence on the uplink in order to be compliant with the targeted capacity (1Terabit/s by 2025).

Item Type:Conference or Workshop Item (Paper)
Additional Information:Thanks to Spie digital library. The definitive version is available at https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10096/1009608/Optical-ground-station-optimization-for-future-optical-geostationary-satellite-feeder/10.1117/12.2249994.short?tab=ArticleLink
HAL Id:hal-01741612
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:Other partners > Airbus (FRANCE)
French research institutions > Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE)
Other partners > IRT Saint Exupéry - Institut de Recherche Technologique (FRANCE)
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Deposited By: Marie-Pierre Le Tallec
Deposited On:23 Mar 2018 10:52

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