Method and the device in order detects PMD parameter in the signal which is transmitted and by optical fiber link to compensate, and the communication system which uses these

摘要

It has one which transmits the 1st wide band light information which possesses the B band transmission channel at least, optical fiber link (12) the method of detecting the parameter which shows PMD, includes the stage which divides the B band into the sub band. Concerning each sub band, the 2nd standard light information (s₂) is formed, s the 3rd signal which superposes₁ and s₂ (s₃) is required making use of this. Concerning each of the 3rd signal, the 1st parameter which is thought that the PMD is shown, is calculated, the 2nd parameter which is thought that PMD of the 1st wide band signal is shown making use of the said 1st parameter of all sub bands, is calculated. To use the PMD compensator (14) as portion of PMD compensating method for the transmission system which uses the parameter which was calculated for the feedback guide it is possible the above-mentioned method. The detection device by this method, the formation device which forms the 2nd standard light information (18) with, the optical mixing device which superposes the 1st and 2nd signal (19) with, the electric roaring signal namely signal s one which calculates₁ and s₂ or the photodetector above that and, the 1st calculation expedient which calculates 1st parameter and, processes everything of 1st parameter, furthermore is processed (24) the 2nd expedient which seeks 2nd parameter (23) with includes from there. The compensator (14) and calculation stage (16) it designates the detection device, as portion of the compensator which it has, calculates compensation, it is possible to guide the compensator. It is possible to designate the whole as portion of the optic fiber communications system.