Patent ID: 7324723

Claim:
An optical waveguide comprising a core and a cladding layer, wherein a wall surface, which is formed by cutting out at least a part of the core in a thickness direction of the optical waveguide plane through irradiation of a laser beam in a direction perpendicular to an optical waveguide plane, crosses at least a part of the core, and includes a single specular surface, wherein the single specular surface is perpendicular to the optical waveguide plane and inclined with respect to an extension direction of the core, wherein the single specular surface has at least first and second portions and is positioned to split a beam simultaneously into first and second beams, the first portion of the single specular surface reflects the first beam toward a first direction in the extension direction of the core and the second portion of the single specular surface reflects the second beam toward a second direction in the extension direction of the core, and wherein the first portion of the single specular surface is inclined with respect to the first direction in the extension direction of the core, and the second portion of the single specular surface is inclined with respect to the second direction in the extension direction of the core.