Patent ID: 6724525
Filing Date: 2004-04-20
Classification: H01S

Abstract:
A Raman amplifying control unit which can control an exciting light supply means for supplying pump light into an optical transmission line so as to Raman amplify signal light in the optical transmission line of an optical transmission system having at least one relay station, said Raman amplifying control unit being equipped with:inspection light introducing means for outputting inspection light to inspect an optical transmission line and introducing the inspection light into the optical transmission line; back-scattering light receiving means for receiving the back-scattering light that arises when the inspection light propagates through the optical transmission line; and control means for finely adjusting a an exciting power and/or controlling a wavelength of pump light to the optical transmission line from said exciting light supplying means, such control being made according to the results of inspecting the optical transmission line according to the results of receiving the back-scattering light by the back back-scattering light receiving means; wherein said inspection light introducing means, said back-scattering light receiving means, and said control means are provided together with said exciting light supplying means in a station on the transmitting side or receiving side of the optical transmission system.