Patent ID: 7255493

Claim:
An optical semiconductor module comprising: an optical transmission channel including a waveguide which transmits a light beam, and an end face in an optical axis direction, at which a part of the waveguide is exposed; a holding member including a surface, the holding member mechanically holding the optical transmission channel with the end face of the optical transmission channel being exposed from the surface; electric wiring formed on the surface of the holding member; an optical semiconductor element, being faced with the surface of the holding member, including an active area to emit or receive a light beam and an electrode pad being electrically connected to the electric wiring, the active area being optically coupled to the waveguide at the end face of the optical transmission channel; and an electrical insulation film interposed between the optical semiconductor element and the optical transmission channel, including a plurality of openings each corresponding to an electrical connection between the electrode pad and the electric wiring, and an optically coupling portion between the active area of the optical semiconductor element and the waveguide of the optical transmission channel, the electrical insulation film being in contact with a portion of the end face of the optical transmission channel and specifying a position of the end face of the optical transmission channel in the optical axis direction.