Patent ID: 6678306
Filing Date: 2004-01-13
Classification: H01S

Abstract:
A semiconductor laser device comprising:a semiconductor laser element having a pair of end surface cleavage planes which allows therebetween laser oscillation in a plurality of Fabry-Perot modes; an external resonator being coupled to said semiconductor laser element via a first cleavage plane of said pair of cleavage planes of said semiconductor laser element, said external resonator including a wavelength selection element which has a passband including more than one wavelength of more than one Fabry-Perot mode out of said plurality of Fabry-Perot modes; a high-frequency superimposing unit which superimposes a high-frequency current on a driving current of said semiconductor laser element; and a current source supplying the driving current to the laser semiconductor element, said high-frequency driving superimposing unit the high-frequency current on an output of the current source.