Patent ID: 8009947
Filing Date: 2011-08-30
Classification: H01S

Abstract:
1. An optical semiconductor device comprising: a waveguide that has one or more first segments, one or more second segments and a plurality of third segments, the first segment having a region that includes a diffractive grating and another region that is a space region combined to the region, the second segment having a region that includes a diffractive grating and another region that is a space region combined to the region, a length of the second segment being different from that of the first segment, the third segment having a region that includes a diffractive grating and another region that is a space region combined to the region, a length of the third segment being shown as L a refractive index control portion that controls refractive index of the first segment through the third segments; and a controller controlling the refractive index control portion.