Special Section on Free-Space Laser Communication

Investigation on adaptive optics performance from propagation channel characterization with the small optical transponder

[+] Author Affiliations
Cyril Petit, Nicolas Védrenne, Marie Therese Velluet, Vincent Michau

ONERA, The French Aerospace Lab, Theoretical and Applied Optics Department, Châtillon Cedex 92322, France

Geraldine Artaud

CNES, DCT/RF/ITP, 18, av. Edouard Belin, 31401 Toulouse Cedex 9, France

Etienne Samain

OCA-Géoazur, 2130, Route de l’Observatoire, Saint-Vallier-de-Thiey 06460, France

Morio Toyoshima

National Institute of Information and Communications Technology, Space Communication Systems Laboratory, 4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184-8795 Japan

Opt. Eng. 55(11), 111611 (Sep 14, 2016). doi:10.1117/1.OE.55.11.111611
History: Received May 17, 2016; Accepted August 24, 2016
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Abstract.  In order to address the high throughput requested for both downlink and uplink satellite to ground laser links, adaptive optics (AO) has become a key technology. While maturing, application of this technology for satellite to ground telecommunication, however, faces difficulties, such as higher bandwidth and optimal operation for a wide variety of atmospheric conditions (daytime and nighttime) with potentially low elevations that might severely affect wavefront sensing because of scintillation. To address these specificities, an accurate understanding of the origin of the perturbations is required, as well as operational validation of AO on real laser links. We report here on a low Earth orbiting (LEO) microsatellite to ground downlink with AO correction. We discuss propagation channel characterization based on Shack–Hartmann wavefront sensor (WFS) measurements. Fine modeling of the propagation channel is proposed based on multi-Gaussian model of turbulence profile. This model is then used to estimate the AO performance and validate the experimental results. While AO performance is limited by the experimental set-up, it proves to comply with expected performance and further interesting information on propagation channel is extracted. These results shall help dimensioning and operating AO systems for LEO to ground downlinks.

© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Cyril Petit ; Nicolas Védrenne ; Marie Therese Velluet ; Vincent Michau ; Geraldine Artaud, et al.
"Investigation on adaptive optics performance from propagation channel characterization with the small optical transponder", Opt. Eng. 55(11), 111611 (Sep 14, 2016). ; http://dx.doi.org/10.1117/1.OE.55.11.111611


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