Bit-error rate of PSK heterodyne optical communication system and its degradation due to spectral spread of transmitter and local oscillator

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Abstract
In a PSK heterodyne optical communication system, the FM noise of the transmitter and local oscillator degrades the bit-error rate (BER). A theory is presented giving the BER of such a system considering the FM-noise effect. To verify the theory, BER measurement is performed using a simulation model of the PSK heterodyne system.