Patent ID: 6433900
Filing Date: 2002-08-13
Classification: H04J,H04Q

Abstract:
An optical wavelength multiplexing system including a plurality of input and output optical fibers for transmitting wavelength-multiplexed optical signals, for processing the optical signals for each wavelength, comprising:an output side of a node duplexed into a first system and a second system, and a protection switch having: a demultiplexer for demultiplexing optical signals to be inputted after their wavelengths have been multiplexed, into optical signals of respective wavelengths; an optical selector provided for each wavelength, for selecting optical signals outputted from either one of the duplexed nodes; and a multiplexer for multiplexing optical signals of respective wavelengths transmitted from the optical selector, and wherein when a fault is detected in an optical signal of a certain wavelength included in optical signals transmitted from either one of the systems, the optical selector only switches an optical signal of the wavelength in which the fault is detected, into the other system.