OPTICAL TRANSMITTER-RECEIVER

摘要

PROBLEM TO BE SOLVED: To avoid waveform deterioration dependent on a mark rate by providing an optical receiver with a Mach-Zehender interferometer, a balance type light receiver for photoelectric converting a signal light from the Mach-Zehender interferometer and a three value decision discriminator which identifies a signal sequence of an AMI code the balance type light receiver outputs and converts it into an NRZ code. SOLUTION: A Mach-Zehender(MZ) interferometer 14 is set so that an output of a balance type light receiver 15 becomes not an NRZ code but an AMI code and the AMI code outputted from the balance type light receiver 15 is identification reproduced by a three value decision discriminator 17. Since the AMI code has a feature that it has a ground level when '0' and a plus amplitude and a minus amplitude are alternately outputted when '1', it does not essentially have an AC component. Thus, even if an optical receiver is constituted by an AC connection system, waveform deterioration dependent upon a rate of mark does not occur and stable reception is enabled for any input signals.