A wavelength division multiplexing multi-frequency optical source is used to provide downstream transmission of information signals at discrete optical wavelengths from a central office to a plurality of optical network units. A passive optical demultiplexer in a remote node routes the downstream information...http://www.google.de/patents/US5550666?utm_source=gb-gplus-sharePatent US5550666 - Wavelength division multiplexed multi-frequency optical source and broadband incoherent optical source
