Patent ID: 8168376

Claim:
A method of manufacturing an optical waveguide device, comprising the steps of: forming a through hole as an alignment mark for photomask alignment in a metal substrate having a first surface with insulation layers in a predetermined pattern formed thereon, the through hole being punched through the metal substrate; coating the first surface of said metal substrate with a first photosensitive resin layer; preparing a first photomask with an alignment mark and aligning the alignment mark of the first photomask and the alignment mark formed in the metal substrate to thereby expose the coated surface to light with said first photomask positioned relative to the coated surface of the first photosensitive resin layer of the metal substrate and developing the coated surface, to transfer a conductor pattern including pads for mounting of light-receiving and light-emitting elements onto said first photosensitive resin layer, thereby removing an unnecessary portion of said first photosensitive resin layer; forming a conductor layer along the conductor pattern uncovered by the removal of the unnecessary portion of said first photosensitive resin layer; coating a second surface of said metal substrate opposite from the first surface with a second photosensitive resin layer; preparing a second photomask with an alignment mark and aligning the alignment mark of the second photomask and the alignment mark formed in the metal substrate to thereby expose the coated surface to light with said second photomask positioned relative to the coated surface of the second photosensitive resin layer of the metal substrate and developing the coated surface, to transfer an optical coupling opening pattern onto said second photosensitive resin layer, thereby removing an unnecessary portion of said second photosensitive resin layer; and performing an opening formation process on the metal substrate along the optical coupling opening pattern uncovered by the removal of the unnecessary portion of said second photosensitive resin layer to form an optical coupling opening, wherein, after the light-receiving and light-emitting elements are mounted on the pads of said conductor layer, said light-receiving and light-emitting elements and an optical waveguide are optically coupled to each other by using said optical coupling opening and by fixing one end of the optical waveguide at the optical waveguide coupling opening formed portion.