OPTICAL COMMUNICATION NETWORK

摘要

PROBLEM TO BE SOLVED: To provide an optical communication network that can transmit an optical signal between two areas apart by an ultra-long distance economically with high reliability. SOLUTION: A ring network tying optical add-drop multiplexers by a very short wavelength multiplex optical transmission line are respectively placed in the two areas apart by a ultra-long distance, two inter-area wavelength multiplex optical transmission lines interconnecting the two areas or more are installed and the two ring networks are interconnected by the inter-area wavelength multiplex optical transmission lines via an optical cross connector.