Patent ID: 8705925

Claim:
An optical waveguide film, comprising: a core layer having an optical waveguide area having an X-direction and a Y-direction orthogonal to the X-direction, the optical waveguide area including a plurality of core portions each having a strip shape and positioned side by side, a plurality of cladding portions each having a strip shape and each comprising a resin having an optical refractive index smaller than an optical refractive index of each of the core portions, and a plurality of cutter lanes formed in the cladding portions such that the cutter lanes are extending parallel to the X-direction of the optical waveguide area in the cladding portions, wherein the plurality of core portions is positioned such that the core portions are extending along the X-direction of the optical waveguide area, the cladding portions are interposed between side surfaces of the core portions such that the core portions are adjoined through the cladding portions in the core layer, the plurality of cutter lanes is positioned such that a plurality of optical waveguides is formed by cutting at least one of the cladding portions along at least one of the cutter lanes, and the optical waveguide area in the core layer includes a varying area portion in which each of the cladding portions has a width varying along the X-direction at a constant ratio, where the width is obtained by deducting widths of the cutter lanes from widths of the cladding portions at an arbitrary X-coordinate of an X-axis in the X-direction.