Patent ID: 7974542

Claim:
An optical time division multiplexing differential phase shift keying (OTDM-DPSK) signal generator system, comprising: an OTDM-DPSK signal generator, including an optical splitter splitting an optical pulse string into a first optical pulse string and a second optical pulse string, a first and a second phase modulator that receive the first and second optical pulse strings, generating and outputting a first and a second channel differential phase shift keying (DPSK) signal coded in DPSK scheme respectively, an optical coupler that provides the first and second channel DPSK signals with an optical time division multiplexing, generating and outputting a duplex OTDM-DPSK signal, and a monitor signal splitter that splits a monitor signal, from the duplex OTDM-DPSK signal; and an optical carrier phase difference detector receiving the monitor signal, and generating and outputting an optical carrier phase difference detection signal as a function of an optical carrier phase difference between optical pulses in the monitor signal, wherein said OTDM-DPSK signal generator comprises a bit delay device, said bit delay device providing the second channel DPSK signal with a time delay necessary to bit interleave each of the first and second channel DPSK signals to provide them with the optical time division multiplexing, the time delay corresponding to half of the time on a time axis occupied by one of the optical pulses in the second channel DPSK signal.