(57) ABSTRACT A method of manufacturing an optical waveguide, includes forming a first
light path core layer having a first light path length on a first cladding layer, forming a groove …

An optical module including a first optical coupler, a second optical coupler, a first optical
waveguide; a second optical waveguide; a first electrode provided on the first optical …

An optical device, includes: a first substrate 121 including a first surface 121A and a second
surface 121B; a second substrate 122 including a first surface 122A and a second surface …

An optical device includes a Substrate and a first optical waveguide including a mesa. The
mesa includes a first lower clad layer portion, a first core layer portion, and a first upper clad …

An optical semiconductor device includes: a base Substrate which has a concave portion; a
light-emitting element which is provided in the concave portion, and which emits light; a …

A manufacturing method of an optical waveguide, the optical waveguide including a first
clad layer; a core layer formed on the first clad layer and configured to propagate light; a …

An optical communication system includes an optical trans mission terminal including a first
transmitter for transmitting an optical signal, and a second transmitter for transmitting …

Disclosed is a photodiode array which includes a plurality of pin photodiodes arrayed on a
Semi-insulative Semiconduc tor Substrate, each photodiode including an n-type Semicon …

An optical module includes: at least one optical waveguide provided on a Surface of a
substrate; a plurality of grooves provided in the optical waveguide on the surface of the sub …

(57) ABSTRACT A method for manufacturing a semiconductor optical waveguide device
includes the steps of forming a waveguide mesa having first and second portions by etching …