Patent ID: 6962667

Claim:
A process for producing a polymer optical waveguide, comprising the steps of: preparing a mold by applying a mold-forming resin layer onto a master template having formed therein a convex portion for the optical waveguide, peeling the layer from the master template to obtain a template, and cutting both ends of the template to expose a concave portion for the optical waveguide that corresponds to the convex portion; bringing the mold into contact with a film used for a cladding layer which has a good adhesiveness to the mold; introducing, by capillarity, a UV-curable resin or heat-curable resin which forms a core into the concave portion of the mold by contacting the UV-curable resin or heat-curable resin with one end of the mold with which the film is close contact; curing the introduced UV-curable resin or heat-curable resin, and removing the mold from the film; and forming a cladding layer on the film on which the core has been formed, wherein a sectional area, a sectional shape, or both of a sectional area and a sectional shape of the core changes in a longitudinal direction of the core, and both end faces of the core have different areas.