Patent ID: 6028874
Filing Date: 2000-02-22
Classification: B82Y,H01S

Abstract:
A III-V group semiconductor laser comprising:a first clad layer,a first optical waveguide layer,a first barrier layer,an active layer,a second barrier layer,a second optical waveguide layer, anda second clad layer, directly formed on each other on a GaAs substrate which is a III-V group compound semiconductor, wherein each of the first and second clad layers and the first and second optical waveguide layers is of a composition which matches with the GaAs substrate in lattice,said active layer is of a composition which induces compressive strain on the GaAs substrate,each of the first and second barrier layers is of a composition which induces tensile strain on the GaAs substrate, thereby compensating for the compressive strain induced in the active layer,the ratio of V group elements contained in the first optical waveguide layer is the same as that in the first barrier layer, andthe ratio of V group elements contained in the second optical waveguide layer is the same as that in the second barrier layer.