Method and a device for distributed Raman amplification in an optical fiber by optical signals with different wavelengths and different polarizations

摘要

A device (D) for amplifying optical signals is connected to an optical fiber (3) conveying an optical data signal and delivers into said optical fiber first and second optical pump signals at different wavelengths for amplifying the data signal by stimulated Raman scattering. Each pump signal comprises two pump signal components whose polarizations are mutually orthogonal. Moreover, the amplification device D comprises a control module 14 for delivering alternately a first combined pump signal and a second combined pump signal, the first combined pump signal comprising a component of the first pump signal and a component of the second pump signal that have mutually orthogonal polarizations and the second combined pump signal comprising the other component of the first pump signal and the other component of the second pump signal.