Patent ID: 7579630
Filing Date: 2009-08-25
Classification: B82Y,H01S

Abstract:
1. A semiconductor optical device comprising: a GaAs substrate of a first conductivity type, said GaAs substrate being used as a lower cladding; a III-V compound semiconductor layer provided on the GaAs substrate; an active layer provided on the III-V compound semiconductor layer; and an upper cladding layer of a second conductivity type provided on the active layer, said active layer being sandwiched between said lower cladding and said upper cladding, wherein the band gap energy of the III-V compound semiconductor layer is larger than the band gap energy of the GaAs substrate, wherein the band gap energy of the active layer is smaller than the band gap energy of the GaAs substrate, and wherein the thickness of the III-V compound semiconductor layer is not more than 0.2 μm.