Patent ID: 8923669
Filing Date: 2014-12-30
Classification: B29D,G02B

Abstract:
1. An optical waveguide, comprising: an optical waveguide layer including a lower cladding layer, a plurality of core layers formed on the lower cladding layer, and an upper cladding layer covering the plurality of core layers; a plurality of light path converting portions provided to a light entering side and a light emitting side of both end sides of the plurality of core layers of the optical waveguide layer respectively; a plurality of light entering portions demarcated in an upper surface of the upper cladding layer located at a position corresponding to the light path converting portions of the light entering side; and a plurality of light emitting portions demarcated in an upper surface of the upper cladding layer located at a position corresponding to the light path converting portions of the light emitting side; wherein an entire area of the upper surface of the upper cladding layer in areas except the light entering portions and the light emitting portions is a roughened surface, each upper surface of the light entering portions and the light emitting portions is only a smooth surface, the roughened surface and the smooth surface are same face with the upper surface of the upper cladding layer and are same horizontal face over the whole, at least a portion of the roughened surface is in substantially the same plane as the smooth surface, and a transparent surface of the upper cladding layer is exposed in the smooth surface.