TRANSMITTER, RECEIVER AND TRANSMITTING DEVICE FOR OPTICAL WAVELENGTH MULTIPLEX, AND OPTICAL TRANSMISSION METHOD

摘要

PROBLEM TO BE SOLVED: To minimize the increase of equipment even in the case of a redundant configuration by providing plural optical transmission circuits, one or more spare optical transmission circuits, a monitoring control circuit which controls the optical transmission circuits and the spare optical transmission circuit and a switching circuit which switches an arbitrary optical transmission circuit to the spare transmission circuit by a control signal from the monitoring control circuit. SOLUTION: Branching parts 21 to 23 distribute output of a main signal processing circuit into two. Optical transmission circuits 1 to 3 output optical signals of an optical transmission wavelength of λ1 to λn and an optical multiplexer 15 optical wavelength multiplexes the optical signals and outputs them. Here, upon detecting a false of the optical transmission circuit 2, a monitoring control circuit 11 outputs a control signal to a selector 24 so that a signal of the branching part 22 is selected and notifies the monitoring circuit of an opposed station of a circuit number of a circuit which transmits at a spare optical transmission circuit 4. The spare optical transmission circuit 4 can switch/transmit all the circuits from λ1 to λn and operates as a spare circuit for the optical transmission lines 1 to 3.