Patent ID: 8279907
Filing Date: 2012-10-02
Classification: H01S

Abstract:
1. A semiconductor laser device comprising: a semiconductor laser having a reflector region, a gain region for laser oscillation and a plurality of refraction index controllers, the reflector region having a plurality of segments in which a diffraction grating region and a space region are coupled to each other, the plurality of segments being separated into a plurality of segment groups, the segments in each segment group having a same optical length, the plurality of refraction index controllers being provided according to each segment group and controlling an equivalent refraction index of each segment group; a wavelength controller controlling an oscillation wavelength of the semiconductor laser by controlling the plurality of the refraction index controllers as at least one of control parameters; and a dither controller inputting a dither signal into only one of the segment groups having more segments than any other segment group from one of the refraction index controllers according to the segment group.