Patent ID: 8155161
Filing Date: 2012-04-10
Classification: B82Y,G02B,H01S

Abstract:
1. A semiconductor laser comprising: a semiconductor laser region including a first optical waveguide that includes a gain waveguide, and a reflector region provided at one end of the first optical waveguide, the first optical waveguide extending in a light-propagation direction; and a wavelength-monitoring region including a second optical waveguide and photodiode structures that are optically coupled to the second optical waveguide, in the wavelength-monitoring region, the second optical waveguide being branched into three or more optical waveguides with at least two optical waveguides among the three or more optical waveguides forming first ring resonators having optical path lengths different from each other, wherein the first optical waveguide, the reflector region and second optical waveguide are arranged in the light-propagation direction, the reflector region is provided between the first optical waveguide and the second optical waveguide, and the first resonators are optically coupled between the photodiode structures and the first optical waveguide through the reflector region.