Patent ID: 8778452

Claim:
A method of manufacturing an optical waveguide, comprising: forming a core having a pattern on a surface of an under cladding layer; and forming an over cladding layer so as to cover the core by using a mold including a cavity having a mold surface complementary in shape to the over cladding layer, wherein the forming of the over cladding layer includes: placing the mold with the cavity of the mold positioned upwards, filling the cavity of the mold with a photosensitive resin for the formation of the over cladding layer, after the filling, immersing the core in the photosensitive resin, and exposing the photosensitive resin to light through the mold, with the core immersed in the photosensitive resin, to cure the photo sensitive resin, thereby forming the over cladding layer, wherein the mold is made of a light-transmissive resin and provided with a light-transmissive support plate, wherein mold is produced by placing a mold member identical in shape with the over cladding layer in a mold production container, filling the container with a light-transmissive resin, bringing the light-transmissive support plate into contact with a surface of the light-transmissive resin, curing the light-transmissive resin in that state, fixedly securing the cured light-transmissive resin to the light-transmissive support plate, then taking the cured light-transmissive resin out of the container, and removing the mold member from the cured light-transmissive resin, whereby a hollow resulting from the removal of the mold member serves as the cavity for the formation of the over cladding layer.