Patent ID: 7986862
Filing Date: 2011-07-26
Classification: G02B

Abstract:
1. An optical transmission substrate, comprising: a substrate formed by laminating a plurality of dielectric sheets; and a plurality of cylindrical refractive-index distribution bodies, each of which is made of a photosensitive polymeric material in a cylindrical through hole penetrating each of the dielectric sheets, each of the cylindrical refractive-index distribution bodies including a truncated conical core and a periphery, the core having a higher refractive index in the radial direction than the periphery and having a large-diameter end face and a small-diameter end face, wherein the cores of the refractive-index distribution bodies have a first core and a second core in two adjoining dielectric sheets, 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.