Patent ID: 6977769
Filing Date: 2005-12-20
Classification: H01S,H04B

Abstract:
1. A pump light source device for outputting a pump light to amplify signal lightwaves transmitted into an optical fiber utilizing Raman scattering comprising: a plurality of pairs of pump light sources, a plurality of polarization beam combiners or polarization-maintaining optical beam couplers, a plurality of depolarizers, and an optical beam coupler for combining a plurality of lightwaves, the output lightwaves from each pair of light sources being respectively input to a combiner or coupler of the plurality of polarization beam combiners or polarization-maintaining optical beam couplers to output a composite lightwave with orthogonal state of polarization or maintaining the polarization state of inputting, each composite lightwave being respectively input to a depolarizer of the plurality of depolarizers so as to output depolarized lightwaves with a lower degree of polarization, wherein the depolarized lightwaves being combined and output by the optical beam coupler.