Patent ID: 7873082
Filing Date: 2011-01-18
Classification: B82Y,H01S

Abstract:
1. A semiconductor integrated device comprising: a plurality of wavelength tunable lasers, provided on a semiconductor substrate, having oscillation wavelength ranges different from each other, each of said plurality of wavelength tunable lasers comprising an optical waveguide including, alternately in an optical axis direction, a gain waveguide portion being capable of generating gain by current injection and a wavelength controlling waveguide portion being capable of controlling an oscillation wavelength by current injection or voltage application, and a diffraction grating provided along the optical waveguide of both the gain waveguide portion and the wavelength controlling waveguide portion; wherein a value obtained by dividing a width of the wavelength controlling waveguide portion by a width of the gain waveguide portion in one of said plurality of wavelength tunable lasers is larger than a value obtained by dividing a width of the wavelength controlling waveguide portion by a width of the gain waveguide portion in a different one of said plurality of wavelength tunable lasers, the different wavelength tunable laser oscillating on a shorter wavelength side with respect to an oscillation wavelength range of the one wavelength tunable laser.