Patent ID: 9704840
Date: 2017-07-11
CPC Classifications: G01S,H01L

Claim:
1. An optical semiconductor device, comprising: a substrate, including a semiconductor material, and including a main surface and a back surface facing oppositely in a thickness direction; a semiconductor light-emitting element at the substrate; a semiconductor light-receiving element at the substrate; a conductive layer, conducting the semiconductor light-emitting element and the semiconductor light-receiving element; and an insulating layer between at least a portion of the conductive layer and the substrate; wherein the substrate includes a recess recessed from the main surface and including a bottom surface of a light-emitting side recess where the semiconductor light-emitting element is disposed, and a bottom surface of a light-receiving side recess where the semiconductor light-receiving element is disposed; a light-emitting side transparent portion for light from the semiconductor light-emitting element to pass through the bottom surface of the light-emitting side recess to the back surface; and a light-receiving side transparent portion for light from the back surface to pass through the bottom surface of the light-receiving side recess to the semiconductor light-receiving element.