Patent ID: 7734124

Claim:
An optical waveguide, comprising: an optical waveguide main body comprising: a first cladding layer facing at least one of a light emitting element and a light receiving element; a second cladding layer; and a core portion for transmitting a light signal and provided between the first cladding layer and the second cladding layer; and mirrors for reflecting the light signal; and wherein the optical waveguide main body has: a first region in which the core portion and the mirrors are arranged and the light signal is transmitted; and a second region arranged on both sides of the first region and not contributing to a transmission of the light signal, wherein through vias that pass through the optical waveguide main body are provided in the second region, and the through vias are connected to a terminal of the light emitting element or a terminal of the light receiving element, wherein the first region on a side that faces the light emitting element or the light receiving element is protruded larger than the second region on a side that faces the light emitting element or the light receiving element, and wherein the first cladding layer is provided only in the first region.