Patent ID: 7457339
Filing Date: 2008-11-25
Classification: H01S

Abstract:
1. A semiconductor laser apparatus comprising: first and second semiconductor lasers; first and second optical waveguides connected to outputs of said first and second semiconductor lasers, respectively; a multiplexer for multiplexing outputs of said first and second optical waveguides; and a semiconductor optical amplifier adapted to receive output light from said multiplexer; wherein said first semiconductor laser and respective core layers of said first optical waveguide and said multiplexer are optically connected to one another, and said second semiconductor laser and respective core layers of said second optical waveguide and said multiplexer are optically connected to one another; wherein a first gate region is disposed between a MMI coupler (a) and a refractive index control core layer (b) in a front DBR region; and wherein assuming that a band-gap value of the core layer of said semiconductor amplifier is E