Patent ID: 8792755

Claim:
A light transmission path package formed by a bottom plate for mounting a substrate and side walls raised from the bottom plate so as to interiorly accommodate at least one end including an incident/exit port of an optical signal of a light transmission path including a core made of material having translucency and a clad made of material having an index of refraction different from an index of refraction of the core, an optical element for transmitting or receiving the optical signal with respect to the end, and the substrate for mounting the optical element, a sealing resin having translucency being filled inside so as to cover the optical element and so as to form a boundary between the optical element and the light transmission path; the light transmission path package comprising: a first sealing surface adjustment member and a second sealing surface adjustment member, which are arranged with facing each other by way of the optical element on the substrate, having a length in a normal direction of the substrate surface from the substrate surface of a height H 2 ; wherein a relational expression H3<H2<H1 is satisfied where the height H 1 is a distance in the normal line direction from the substrate surface to a surface of the light transmission path facing the substrate surface, and the height H 3 is a length in the normal line direction from the substrate surface in the optical element; and the sealing resin is filled so as to cover the first sealing surface adjustment member and the second sealing surface adjustment member and so as not to come in contact with the light transmission path.