Patent ID: 8366325

Claim:
An optical module comprising: a substrate; a plurality of optical elements disposed on said substrate; an optical connector unit that holds a plurality of optical fibers and includes two guide-pin holes in which two guide pins fit in respectively, wherein said optical connector unit is disposed on a planar surface of said substrate in a location where said plurality of optical fibers and said plurality of optical elements are optically coupled; and a cover including an opening for slidably attaching sidewalls of said optical connector unit to said substrate, wherein said cover covers said plurality of optical elements, wherein two alignment marks are provided on said planar surface of said substrate, and the two alignment marks are visually recognizable through each of said two guide-pin holes, and two guide-pins are respectively disposed in the two guide-pin holes, and an end of each of the two guide-pins protrude from a first surface of said optical connector unit that opposes a second surface of said optical connector unit that is in contact with said planar surface of said substrate.