Patent ID: 8909010

Claim:
An optical coupling structure comprising: an optical semiconductor element comprising a light receiving/emitting portion on an upper face thereof and being mounted on a substrate on a side of a lower face thereof; an optical fiber having an optical axis that intersects an optical axis of the optical semiconductor element at a predetermined angle and being arranged separately from a mounting face of the substrate; and an optical coupling portion configured to convert an optical path between the optical semiconductor element and an optical fiber and optically couple the optical semiconductor element and the optical fiber, wherein the optical coupling portion is made of a resin that is transparent with respect to a transmitted light, the resin adhering to both at least a portion of the light receiving/emitting portion of the optical semiconductor element and at least a portion of an end portion of the optical fiber; wherein the optical semiconductor element and the optical fiber are bonded to each other with the resin itself that constitutes the optical coupling portion; wherein an outer face of the resin that constitutes the optical coupling portion has a shape that is concave toward the light receiving/emitting portion of the optical semiconductor element and the end portion of the optical fiber; wherein the resin that constitutes the optical coupling portion is arranged so as not to include an intersection point where the optical axis of the optical semiconductor element and the optical axis of the optical fiber intersect; wherein a position at which the outer face of the resin faces the light receiving/emitting portion is between the intersection point and the light receiving/emitting portion, and a position at which the outer face of the resin faces the end portion of the optical fiber is between the intersection point and the end portion of the optical fiber; and wherein an angle formed between the upper face of the optical semiconductor element and a tangent of the outer face of the resin at a position where the optical axis of the optical semiconductor element and the outer face of the resin intersect is more than 0°.