Optical amplifier supervisory control method in WDM communication system
First Claim
1. An optical-amplifier supervisory control method in an optical node including an optical pre-amplifier and an optical post-amplifier, comprising:
- automatically controlling the gain of the optical post-amplifier; and
starting the optical pre-amplifier in an automatic level control mode when starting the optical pre-amplifier, controlling the optical pre-amplifier in an automatic gain control mode when it is in routine operation, and executing an automatic level control in each specified period when it is in routine operation.
1 Assignment
0 Petitions
Accused Products
Abstract
The gain control circuit controls the amplification ratio of EDFA based on the results of having measured the input power monitor which monitors the EDFA input optical level which amplifies light and of having measured the output power monitor which monitors the output optical level. The optical pre-amplifier receives a notice of the number of wavelengths from a fore node and a notice of whether the optical post-amplifier of a fore node is in normal operation by a supervisory control signal, and changes over the gain control circuit to either the ALC or AGC mode. When the number of wavelengths changes while the optical pre-amplifier is operating in the ALC mode, the optical pre-amplifier is controlled in the AGC mode using the backed-up amplifier gain. Also, the gain value when the optical pre-amplifier is in routine operation is backed up in an amplifier gain back-up unit and an back-up unit.
30 Citations
16 Claims
-
1. An optical-amplifier supervisory control method in an optical node including an optical pre-amplifier and an optical post-amplifier, comprising:
-
automatically controlling the gain of the optical post-amplifier; and
starting the optical pre-amplifier in an automatic level control mode when starting the optical pre-amplifier, controlling the optical pre-amplifier in an automatic gain control mode when it is in routine operation, and executing an automatic level control in each specified period when it is in routine operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. The optical-amplifier supervisory control system in an optical node including an optical pre-amplifier and an optical post-amplifier, comprising:
-
an optical post-amplifier controlled in the automatic gain control mode;
an optical pre-amplifier started in the automatic level control mode when it is started, controlled in the automatic gain control mode when it is in routine operation, and controlled in the automatic level control mode in each specified period when it is in routine operation. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
Specification