Patent ID: 7319707
Filing Date: 2008-01-15
Classification: H01S

Abstract:
1. An L-band light source comprising: a gain medium having first and second sides, and configured to generate the L-band amplified spontaneous emission (ASE); a first pump light source configured to generate first pumping light; a first wavelength selective coupler configured to supply the first pumping light to the gain medium; and a first reflector configured to reflect a part of ASE outputted to the fist side of the gain medium, the first reflector having a predetermined reflection wavelength included in C-band, a terminal end arranged to receive another part of the ASE output that passes through said first reflector, said terminal end prevents reflection to about no more than 4% of the ASE ouput that passes through said first reflector; wherein the L-band light source does not receive an L-band optical signal from outside of the L-band light source.