Patent ID: 7477672
Filing Date: 2009-01-13
Classification: H01S

Abstract:
1. A waveguide gain module comprising: a source of pump radiation; a waveguide configured to receive the pump radiation and to provide optical gain, wherein the waveguide includes two or more intentionally doped waveguide sections disposed in series and having different concentrations of one or more dopants; wherein the one or more dopants, responsive to the pump radiation, provide the optical gain; wherein a first optical intensity in the first waveguide section is greater than a second optical intensity in the second waveguide section; and wherein a first doping concentration in the first waveguide section is lower than a second doping concentration in the second waveguide section; wherein each of said intentionally doped waveguide sections has a length less than 10 meters; wherein each of said intentionally doped waveguide sections has a small signal pump absorption greater than 50 dB/m.