Patent ID: 8488637
Filing Date: 2013-07-16
Classification: B82Y,H01S

Abstract:
1. A semiconductor laser, comprising: a light emission end facet; a first optical waveguide extending in a predetermined optical-axis direction, the first optical waveguide being optically coupled to the light emission end facet; a ring resonator having a plurality of periodic transmittance peak wavelengths, the ring resonator being optically coupled to the first optical waveguide; a plurality of gain waveguides that generate light by injection of current; an optical coupler portion that optically couples the first optical waveguide to each of the plurality of gain waveguides; and a plurality of second optical waveguides respectively optically coupled to the plurality of gain waveguides, each second optical waveguide of the plurality of second optical waveguides including a diffraction grating having a reflection wavelength band, wherein the reflection wavelength bands of the diffraction gratings are different from each other, and each reflection wavelength band includes a single transmittance peak wavelength of the ring resonator.