OPTICAL PHASE DIFFERENCE CONTROLLER AND OPTICAL PHASE DIFFERENCE CONTROL METHOD AND OPTICAL SIGNAL TRANSMITTER

摘要

PROBLEM TO BE SOLVED: To control an inter-bit phase difference of a carrier wave which set one-bit period at every spacing.;SOLUTION: The present invention relates to an optical phase difference controller which controls a phase difference of an optical time sharing multiplex signal obtained by an optical-time-division-multiplexing of a plurality of coded modulated optical signals to one signal. It has: a first interferometer 205 which carries out the wave synthesizing after a part of the optical time sharing multiplex signal is incorporated and branched twice, and a phase difference corresponding to one bit of the optical time sharing multiplex signal is given between one branching signal and other branching signals; and a low frequency extraction means (217, 219, 214, 213A, 213B, 215, 216, and 212) which doubles adjacent signal which is outputted from the first interferometer 205 and which becomes the same strength every 2 bits, and extracts the signal of a low frequency wave as a signal for phase differential controlling. An optical signal transmitter has a photonic phase difference controller of the configuration.;COPYRIGHT: (C)2007,JPO&INPIT