Patent ID: 7692852
Filing Date: 2010-04-06
Classification: H01S,H04B

Abstract:
1. An optical repeater, 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 first WDM coupler configured to optically couple light to the optical fiber, at least one of an input EDFA connected in series with input end of the optical fiber and an output EDFA connected in series with output end of the optical fiber; and one or more pumping light sources each configured to provide pump light having a central wavelength to the optical fiber via the first WDM coupler, each of the one or more the plurality of pumping light sources includes, the optical fiber 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 semiconductor lasers are different from each other and a wavelength interval between the plurality of semiconductor lasers is greater than 6 nm and smaller than 35 nm, wherein the pumping lights generated by the semiconductor lasers are polarization-combined by the polarization couplers for each wavelength, and output lights from the polarization coupler are combined by the second WDM coupler to obtain output light of each of the one or more pumping lights sources.