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18 April 2005 Coherent transmission feasibility analysis
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This paper summarizes the results of a coherent transmission feasibility study which has been carried out for the coherent optical downlink from the German TerraSAR-X satellite. The receiver is located at an optical ground station. To evaluate the quality of the downlink experiment, effects of atmospheric refractive-index turbulence are investigated. By means of numerical simulations, the influence of turbulence on the communication system is analyzed. The simulated distorted complex field at the receiver is focused by means of a Fourier transform and superimposed on the local oscillator. The impact on the performance of a shot-noise-limited receiver is studied. This investigation showed that a mean bit error rate of 10-9 is achieved easily for all cases and turbulence conditions. The impact of phase-piston temporal fluctuations on the optical phase locked loop is investigated analytically. Beam motion with respect to the turbulence cells is taken into account. The calculated values for the additional residual phase noise due to the atmosphere are too small to cause significant deterioration of the receiver performance.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Joachim Horwath, Florian David, Markus Knapek, and Nicolas Perlot "Coherent transmission feasibility analysis", Proc. SPIE 5712, Free-Space Laser Communication Technologies XVII, (18 April 2005);

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