Patent ID: 7275877

Claim:
An optical module optically connected to a transmission optical fiber, said optical module comprising: an optical processing unit with a box shape housing, said optical processing unit installing an optical processing device, first and second lenses, and a bench, the optical processing device being selected from a group consisting of an electro-absorption modulator, a Mach-Zender modulator, and a semiconductor optical amplifier, said bench mounting said optical processing device and said first and second lenses with the optical processing device located between the first and second lenses; an optical sub-assembly (OSA) unit including a first alignment member, a lens, and an optical sub-assembly with a co-axial shape package independent of said box shape housing, the optical sub-assembly housing a semiconductor optical device therein, said lens optically coupling said semiconductor optical device with said optical processing device; a coupling unit with a co-axial shape package coupled with said transmission optical fiber, said coupling unit including a second alignment member, a lens and a lens holder for holding said lens, said lens optically coupling said optical processing device with said transmission optical fiber; and an optical axis connecting said transmission optical fiber to said semiconductor optical device, wherein said coupling unit, said optical processing unit and said optical sub-assembly unit are arranged on said optical axis in this order, and wherein said first alignment member optically aligns said semiconductor optical device with respect to said optical processing device through said first lens mounted on said bench in a plane perpendicular to said optical axis, and said second alignment member optically aligns said transmission optical fiber with respect to said optical processing device through said second lens on said bench in a plane perpendicular to said optical axis.