Patent ID: 6891607

Claim:
An optical device for measuring and dynamically compensating power loss variations in an optical transmission line comprising an optical fiber having an entry end to receive primary optical signals and an exit end to deliver said primary signals, the device comprising: injector means to inject supervisory signals having a predefined optical power into said line; detector means that extract said supervisory signals at the exit end of said fiber to determine the optical power of said supervisory signals and determine primary information representative of the optical power loss of the supervisory signals in said fiber based on said determined optical power of said supervisory signals and said predefined optical power, and compare said primary information and a value representative of a nominal power loss in said fiber to deliver secondary information representative of a variation in the power loss in said fiber; and control means coupled to said detector means and to the exit end of said fiber and, if a variation in the power loss of the supervisory signals in said fiber is detected, for modifying the power of the primary signals delivered by the exit end of said fiber as a function of said detected power loss variation.