Patent ID: 7769065
Filing Date: 2010-08-03
Classification: B82Y,H01S

Abstract:
1. A semiconductor optical device comprising: a GaAs substrate having a grating surface with a diffraction grating obtained by periodic projections and recesses extending over the entire grating surface of the substrate; a III-V compound semiconductor layer provided on the grating surface of the GaAs substrate, the III-V compound semiconductor layer having a thickness that is more than a groove depth of the periodic projections so as to bury both the projections and the recesses, and having an opposite surface that is flat; and an active layer made of a III-V compound semiconductor containing nitrogen and arsenic as constituent elements, the active layer being provided on the III-V compound semiconductor layer, wherein the III-V compound semiconductor layer has a band gap energy that is larger than either the GaAs substrate or the active layer, and a total thickness of the III-V compound semiconductor layer is more than 5 nm and less than or equal to 50 nm.