Direct detection of optical PSK signals

摘要

A self homodyne direct detection optical transmission system including at a transmitter means for converting binary data signals into double differentiated phase shift keyed (DDPSK) optical signals and at a receiver a two-path optical interferometer having a path unbalance optical delay substantially equal to 1 bit period to which received DDPSK signals are applied means for converting the interferometer output into a plurality of balanced phase diversity outputs, means for recovering from each of the phase diversity outputs a replica of the binary data signals and means for combining the replica signals to form an output binary data signal.