Patent ID: 6674566
Filing Date: 2004-01-06
Classification: H01S,H04B

Abstract:
An optical transmission system comprising a first optical waveguide suitable for transmitting a first information signal, a second optical waveguide suitable for transmitting a second information signal different from the fir information signal, the first and second waveguides extending along substantially a full length of transmission path of the system, and input means for providing an electro magnetic radiation signal into said first waveguide, said signal being suitable for providing distributed Raman amplification of the information signals along at least part of the transmission path, the system further comprising an optical coupling between said waveguides, arranged to transmit at least a portion of the Raman amplification signal from the first waveguide to the second after the Raman amplification signal has travelled along at least part of the transmission path, whilst substantially blocking the transmission of the information signals between the waveguides.