Patent ID: 8965153
Filing Date: 2015-02-24
Classification: G02B,H01S

Abstract:
1. An optical semiconductor device, comprising: a first member which comprises a silicon oxide film formed on a silicon substrate and a silicon core layer formed on said silicon oxide film and extended in a longitudinal direction or one direction of said silicon substrate, and a second member which comprises a compound semiconductor core layer formed on a compound semiconductor substrate, wherein: said silicon core layer comprises a stripe structure, said silicon core layer is configured to allow propagation of light within it, the compound semiconductor core layer comprises a resonator region and a mode conversion region, one end of the resonator region forms a region which is continuous from one end of the mode conversion region, and a total length of a length of the resonator region in a light propagation direction and a length of the mode conversion region in the light propagation direction is shorter than a length of said silicon core layer in the light propagation direction, said resonator region comprises an oscillation region of a semiconductor laser, said mode conversion region includes a plurality of portions tapered to decrease in width in the light propagation direction for outputting light from the silicon core layer, said plurality of tapered portions being located on an opposite side of said mode conversion region from said one end of said mode conversion region, each of said tapered portions being configured to be tapered to have an effective refractive index value which decreases toward the light propagation direction for outputting light from the silicon core layer, a width of said second member perpendicular to said stripe structure is larger than a width of said stripe structure, the plurality of tapered portions are lined up in a direction parallel to said silicon substrate and crossing a stripe direction of said stripe structure, said compound semiconductor core layer is fixed onto at least a part of said silicon core layer, and said compound semiconductor core layer which is provided between said silicon core layer and said compound semiconductor substrate has an effective refractive index value lower than that of said silicon core layer and higher than that of said compound semiconductor substrate.