21 February 2011 Coherent inter-satellite and satellite-ground laser links
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Since February 2008 coherent laser communication links are operational in-orbit. Transmitting data at a rate of 5.625 Gbps they verify the capability of laser communication exemplarily in LEO-LEO and Ground-LEO constellations. The LEO-LEO links run with a bit error rate of 10-11. Acquisition typically is closed within seconds. On the basis of these results laser communication terminals are adapted to LEO-GEO links with a still scalable user data rate of 1.8 Gbps. The terminals will be applied in the European data relay system.
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Mark Gregory, Mark Gregory, Frank Heine, Frank Heine, Hartmut Kämpfner, Hartmut Kämpfner, Robert Lange, Robert Lange, Michael Lutzer, Michael Lutzer, Rolf Meyer, Rolf Meyer, } "Coherent inter-satellite and satellite-ground laser links", Proc. SPIE 7923, Free-Space Laser Communication Technologies XXIII, 792303 (21 February 2011); doi: 10.1117/12.873532; https://doi.org/10.1117/12.873532

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