Patent ID: 6775057
Filing Date: 2004-08-10
Classification: H01S,H04B

Abstract:
A Raman amplifier, comprising:an optical fiber configured to be a Raman amplifying medium and having an input end and an output end and configured to receive a wavelength division multiplex, WDM, optical signal having a signal bandwidth of at least 20 nm; an output optical transmission fiber connected to the output end of the optical fiber; an input optical transmission fiber connected to the input end of the optical fiber; a WDM coupler configured to optically couple light to the optical fiber that is configured to be a Raman amplifying medium; and a plurality of pumping light sources each configured to provide pump light having a central wavelength to the optical fiber that is configured to be a Raman amplifying medium via the WDM coupler, wherein the optical fiber that is configured to be a Raman amplifying medium is configured to have a different dispersion characteristic than at least one of the output optical transmission fiber and the input optical transmission fiber and the central wavelength of each of the pumping light sources are different from each other and a wavelength interval between the plurality of pumping light sources is greater than 6 nm and smaller than 35 nm.