Importance

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Abstract

An optical waveguide board includes a substrate, a cladding layer including a recess on an upper surface, element mount portions defined in the recess, and a plurality of cores in the cladding layer. The plurality of cores extends from the element mount portions to outside the recess in a plan view. The cladding layer includes, on the upper surface, a joint area being frame-shaped and surrounding the recess, and includes a plurality of ridges extending along the cores. At least one of the plurality of cores includes a part overlapping the joint area in a plan view. The part includes an oblique portion extending in a direction oblique to a width direction from an outer peripheral edge toward an inner peripheral edge of the joint area in the cladding layer.

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First Claim