Patent ID: 7106426

Claim:
A method of inspecting an optical waveguide substrate having a substrate and an optical waveguide mounted on the substrate and having a first mirror surface on one end face thereof and a second mirror surface on another end thereof, said method comprising the steps of: applying a laser beam to said one end face in a direction perpendicular to a surface of said optical waveguide, and directing, with said first mirror surface, said laser beam to travel in a direction parallel to the surface of said optical waveguide through said optical waveguide; directing, with said second mirror surface, the laser beam emitted from said other end face of said optical waveguide to travel in a direction perpendicular to the surface of said optical waveguide; detecting, with an imaging device, the laser beam directed and emitted from said other end of said optical waveguide, and outputting, from said imaging device, detected image information representative of light spot positions to a light spot position confirming device; and comparing said detected image information with reference image information stored in said light spot position confirming device, with said light spot position confirming device, to determine whether an amount of light conducted through said optical waveguide is acceptable or not.