Patent ID: 8639067

Claim:
A fabrication method of an optical wiring board, comprising: preparing a board; forming a first clad layer on the board, and further over the first clad layer, laminating a first core member made of a material having a higher refractive index than that of the first clad layer; processing the first core member through use of a mask having a desired pattern to form a plurality of alignment mark patterns and a mirror core pattern on the first clad layer; while positioning with the board in reference to the alignment mark patterns, forming a bevel part on each side of the mirror core pattern by cutting or laser processing, and also forming a concave part on the surface of the first clad layer so that the concave part is disposed in contact with the bevel part; forming a mirror part by selectively coating a metallic reflective film on an area including the bevel part of the mirror core pattern through use of a mask having a desired pattern; laminating a second core member over the board; while positioning with the board in reference to the alignment mark patterns, processing the second core member through use of a mask having a desired pattern to form an optical wiring core pattern on the first clad layer adjacently to the mirror core pattern so that the optical wiring core pattern is disposed perpendicularly with respect to the mirror core pattern; and forming a second clad layer over an area including the mirror part and the optical wiring core pattern so as to provide an optical waveguide layer including the first clad layer, the optical wiring core pattern, and the second clad layer.