Method of optical signal communication

摘要

A method of optical signal transmission is described which suppresses waveform distortion caused by in-optical fiber non-linear optical effects in a long-distance coherent optical communication system. The modulation index of a transmitting station (1) is increased or decreased with respect to the value at which the best receiver sensitivity is obtained when an optical fiber (16) is not in its transmitting condition. Or else, the delay of a delay detection circuit (12) of a receiving station (7) is increased or decreased with respect to the value at which the best receiver sensitivity is obtained when the optical fiber (16) is not in its transmitting condition.