Patent ID: 9224929
Filing Date: 2015-12-29
Classification: G02B,H01L,H01S

Abstract:
1. An optical semiconductor device, comprising: a semiconductor element that provides different spot sizes on an element end face for optical waveguide modes including a first optical waveguide mode and a second optical waveguide mode, the first optical waveguide mode having a first direction of polarization and the second optical waveguide mode having a second direction of polarization which is orthogonal to the first direction of polarization; and a lens positioned at one end face side of the semiconductor element, wherein a spot size at a beam waist position of the lens is smaller than spot sizes in both of the first optical waveguide mode and the second optical waveguide mode, and wherein the lens is provided at a position where a polarization dependent gain or a polarization dependent loss of the semiconductor element is compensated by an inter-polarization difference in optical coupling loss between the semiconductor element and an optical fiber to be coupled to the lens.