Patent ID: 7153038

Claim:
An optical module for single-fiber bidirectional communication, the optical module comprising: (a) a jointing holder for a module for single-fiber bidirectional communication, the jointing holder having a unitary structure comprising: a cylindrical housing having an optical path-forming hole, the optical path-forming hole provided on an optical axis of the cylindrical housing; an optical fiber-fixing portion provided at one end of the cylindrical housing, the optical fiber-fixing portion including a hole in which an optical fiber ferrule can be inserted and also including a face orthogonal to the optical axis; a semiconductor laser-fixing portion provided at the other end of the cylindrical housing, the semiconductor laser-fixing portion including an inner circular face of a cylinder coaxial with an optical axis of an optical fiber, the inner circular face having a certain dimension that provides a fit with an outer circular face of a lens-holding cap or a sleeve of the semiconductor laser; a photodiode-fixing portion provided on an outer surface of the cylindrical housing, the photodiode-fixing portion including a flat face; a slanting groove provided at the photodiode-fixing portion, the slanting groove intersecting with the optical path-forming hole to reach the optical fiber-fixing portion; and an optical filter-fixing face including the slanting groove, the optical filter-fixing face being a face slanting against the optical axis of the optical fiber, and the optical filter-fixing face fixing an optical filter and securing an optical path wherein the optical filter is fixed at the optical filter fixing face and adapted to separate multiplexed wavelengths; (b) a semiconductor laser adapted to be aligned by turning and axially moving within the inner face of the cylinder forming the semiconductor laser-fixing portion and welded at that position, the semiconductor laser having a lens-holding cap or a sleeve that fits inside the inner circular face of the semiconductor laser-fixing portion; (c) an optical fiber having an optical fiber ferrule and a ferrule holder, the ferrule holder being aligned and welded on the fixing face of the optical fiber-fixing portion; and (d) a photodiode aligned on the photodiode-fixing portion and welded at that position.