PROPOSED RECEIVER STRUCTURE FOR OPTICAL COMMUNICATION SYSTEMS THAT EMPLOY HETERODYNE DETECTION AND A SEMICONDUCTOR LASER AS A LOCAL OSCILLATOR.
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Coherent heterodyne detection in optical communication is degraded by phase instabilities present when a semiconductor laser is used as a local oscillator. Postdetection processing that accounts for these instabilities is suggested, based on a diffusion-process model for oscillator instabilities and a maximum-likelihood sequence-estimator of information symbols modulating the received light.