Patent ID: 7615791
Filing Date: 2009-11-10
Classification: H01L,H01S

Abstract:
1. A semiconductor optical device comprising: one facet of the semiconductor optical device and another facet of the semiconductor optical device opposite the one facet; a lower cladding layer of a first conductive type, the lower cladding layer having a first region and a second region, the first region extending in a direction of a predetermined axis, and the second region being adjacent to the first region; an upper cladding layer of a second conductive type; and an active layer provided between the first region of the lower cladding layer and the upper cladding layer, a thickness of the active layer continuously increasing in a direction from the one facet of the semiconductor optical device to the another facet of the semiconductor optical device, the opposing facets being located at longitudinal ends of the active layer, the active layer having TM mode gain and TE mode gain, with the TM mode gain and TE mode gain being substantially equal to each other.