Optical amplifier relay transmission system
AssigneeNEC Corporation
InventorHiroshi Harano
Life of this patent
Estimating the term…
Abstract
As an optical signal to be transmitted, a transmitting station 100 multiplexes a monitoring/control signal SC at a different optical wavelength to the main signal SM, and the optical signal is transmitted via at least two parallel optical transmission lines 10 and 20. A receiving station 200 can process the monitoring/control signal SC by separating it from the main signal MS, which thus need not be converted to an optical signal, and the circuit scale is not increased. In addition, a trouble occurring in either system may be coped with by adopting the optical system which is transmitted via the other system.
Claims9
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;
- and
- a 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.
Dependencies are inferred from the claim text.