Patent ID: 7446932
Filing Date: 2008-11-04
Classification: H01S,H04B

Abstract:
1. Apparatus for controlling amplifier gain in the presence of a transient event across multiple transmitted channels comprising a Raman fiber amplifier and an associated feed-forward control circuit, the Raman fiber amplifier and associated feed-forward control circuit for use in a multi-channel optical fiber transmission system, the apparatus further comprising an optical signal coupler for monitoring optical signal power and outputting a signal to the feed-forward control circuit, the feed-forward control circuit tor compensating for a transient event introduced into the optical fiber transmission system according to a gain control equation, the feed-forward control circuit having adjustable speed of operation, the optical signal coupler further comprising an optical signal monitor, the optical signal monitor for monitoring said optical signal power at two different, the feed-forward control circuit comprising a first control unit responsive to said optical signal coupler and a second control unit, the apparatus further comprising a slow spectrum monitor for transmitting a control signal via an optical supervisory channel to said second control unit.