Patent ID: 6151148
Filing Date: 2000-11-21
Classification: H04B

Abstract:
An optical amplifier relay transmission system comprising:a relay station having a function of amplifying an optical signal transmitted via an optical transmission line, the transmitted optical signal being obtained through multiplexing of a monitoring/control signal at a different optical wavelength from a main signal to the main signal, the transmitted optical signal being transmitted on at least two parallel optical transmission lines, the relay station further having:separating means for separating the monitoring/control signal from the main signal in the optical signal;processing means for predetermined processing of the separated monitoring/control signal;multiplexing means for multiplexing the processed monitoring/control signal to the main signal resulting in a multiplexed signal; anda frame inserting unit for inserting a frame signal in the multiplexed signal for monitoring errors in the transmitted signal, the output of the frame inserting unit being supplied to the at least two parallel optical transmission lines.