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27 January 2004 Direct measurement of the bit error rate improvement of a laser communication system with low-order adaptive optics
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Abstract
Recent experiments performed at UNC Charlotte indicate that we can achieve a reduction in the bit-error rate (BER) for a laser communication system with the implementation of low-order (tip/tilt) adaptive optics in a free-space communication link. We previously reported indirect measurements of the BER by measuring scintillated signals with and without an adaptive optics loop operating. By assuming standard values for receiver noise, we calculated the BER that we would expect. In this paper, we report on the direct measurements of the BER that we observe with the laboratory adaptive optics laser communication system. By directly comparing both the low (“0”) bits and the high (“1”) bits of the outgoing laser modulation signal with the PIN diode-detected signal we determine the BER as a function of various propagation, receiver electronics, and adaptive optics system parameters. Scaling our visible measurements to atmospheric paths and IR wavelengths, we compare our results with vigorous theoretical calculations.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Robert K. Tyson, Douglas E. Canning, and Mark Smith "Direct measurement of the bit error rate improvement of a laser communication system with low-order adaptive optics", Proc. SPIE 5160, Free-Space Laser Communication and Active Laser Illumination III, (27 January 2004); https://doi.org/10.1117/12.506057
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