Optical communication system using polarisation and wavelength modulation.

摘要

In an optical communication system or method, two light signals having different wavelengths and different polarization directions are generated using a common modulation signal on a transmitter side, and the light signals transmitted over a light transmission line are wavelength-discriminated by a wavelength filtering unit disposed on a receiver side to demodulate a signal. The filtering unit may include a plurality of filters which are arranged so that the transmitted light signals of different wavelengths are respectively selected out thereby and a difference signal between outputs of the filters is produced to demodulate the signal.