Detection of M-ARY optical polarization modulation in a communication channel

M. M. Danaei Ahmadi; Mandavilli Mukunda Rao

doi:10.1117/12.184670

16 August 1994 Detection of M-ARY optical polarization modulation in a communication channel

M. M. Danaei Ahmadi, Mandavilli Mukunda Rao

Author Affiliations +

Proceedings Volume 2123, Free-Space Laser Communication Technologies VI; (1994) https://doi.org/10.1117/12.184670
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

An exact derivation is presented for the M-ary detection probability using the conventional decision rule. The analysis assumes a shot-noise-limited case, since in practice the thermal and background noises are negligible. Poisson statistics are employed for the detectors and this takes care of the shot noise. An error in detection occurs when the count corresponding to the signal is less than the count of any of the other detectors. Results indicate that the system performance cannot be improved beyond a certain level, since a component of signal acts as a source of noise to the other detectors. To combat this drawback, an alternate decision rule is suggested so as to improve the system performance. The results obtained for the BER in the two cases indicate that the alternate decision rule leads to a marked improvement especially at higher SNR.

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M. M. Danaei Ahmadi and Mandavilli Mukunda Rao "Detection of M-ARY optical polarization modulation in a communication channel", Proc. SPIE 2123, Free-Space Laser Communication Technologies VI, (16 August 1994); doi: 10.1117/12.184670; https://doi.org/10.1117/12.184670

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