Receiver Analysis for Incoherent Optical ASK Heterodyne Systems

The present paper describes the system calculation of an optical ASK heterodyne receiver with envelope detection in detail. In particular the intermediate frequency signal and the envelope signal are derived taking account of laser phase noise, additive Gaussian noise, influence of the intermediate frequency filter on both noise terms and intersymbol interferences. Based on the derived envelope the probability density function and the bit error rate are calculated exactly and by useful approximations. In regard of a minimum bit error rate the optimum intermediate filter bandwidth is evaluated as a function of the laser linewidths of the transmitter and the local laser. To highlight typical features of incoherent ASK heterodyne systems simulated eye pattern are presented.

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