| 摘要 |
An optical transmission substrate includes an optical transmission body provided in a through hole which has excellent and uniform propagation characteristics. The optical transmission substrate includes: a substrate 1 formed by laminating a plurality of dielectric sheets 10; and a plurality of cylindrical refractive-index distribution bodies 11, each of which is made of a photosensitive polymeric material formed in a through hole 10a penetrating each of the dielectric sheets, each of the refractive-index distribution body including a truncated conical core 12 and a periphery. Each of the cores 12 has a higher refractive index in the radial direction than the periphery and has a large-diameter end face and a small-diameter end face. The cores of refractive-index distribution bodies have a first core and a second core in the two adjoining dielectric sheet, and, the large-diameter end face of the first core and the small-diameter end face of the second core face each other and optically couple together.
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