Patent ID: 8979393
Filing Date: 2015-03-17
Classification: G02B,H01S

Abstract:
1. An optical module comprising: a fiber unit including a stub and a flange in an end portion of the fiber unit, the stub having a coupling fiber in a center portion thereof and a portion accompanied with the coupling fiber protruding from the flange; a housing including a bore and a pocket, the housing installing a first lens in the bore, the pocket receiving the portion of the stub accompanied with the coupling fiber protruding from the flange, the flange being fixed to a surface of the housing; and at least two transmitter optical sub-assemblies (TOSAs) each including a unit lens and an optically active semiconductor device, the TOSAs being optically coupled with the coupling fiber through the respective unit lens and the first lens by optically aligning the respective TOSAs with the housing, wherein the stub has a diameter substantially equal of or slightly less than a diameter of the pocket of the housing to passively align the coupling fiber with the first lens in the housing, wherein the first lens has beam waist on a virtual surface extending from respective ends of the housing where the TOSAs are attached thereto and another beam waist on an end of the coupling fiber secured in the stub, and wherein the respective unit lenses installed in the TOSAs have beam waists on the respective virtual surfaces of the housing and other beam waists on respective surfaces of the optically active semiconductor devices.