Patent ID: 9166366
Filing Date: 2015-10-20
Classification: H01S

Abstract:
1. An optical semiconductor device comprising: a semiconductor structure formed on a n-type substrate, the semiconductor structure having an n-type cladding layer, an active layer, and a p-type cladding layer; a p-type semiconductor layer formed on the plane portion, the first side face and the second side face; and a high-resistance semiconductor layer having deep acceptor level to bury the mesa structure and the p-type semiconductor layer, wherein the first side face is inclined toward a principal surface of the substrate more than the second side face, wherein a distance between a lower end of the active layer and a boundary between the first side face and the second face in a vertical direction to the plane portion is not less than 0.1 μm and not more than 0.5 μm, wherein on the plane portion, a product of the thickness of the p-type semiconductor layer and a concentration of a p-type dopant of the p-type semiconductor layer is not more than 2.5×10 wherein the p-type semiconductor layer has a thickness in the range of 5 nm to 45 nm on the plane portion.