Patent ID: 6851870

Claim:
A method for measuring and assembling transceiver optical sub-assembly, said optical sub-assembly including an axially extended housing having an end provided with a first aperture for an optical fiber to assemble thereto and forming a fiber coupling plane, and an opposite end provided with a second aperture for a functional element to assemble thereto, and a lens provided between said first and second apertures; said method comprising the steps of: preparing one said housing structured for forming said optical sub-assembly; preparing a functional element adapted to assemble to said second aperture on said housing for emitting a laser beam; preparing an image sensor or functionally similar instrument having a sampling lens provided thereon, aligning said sampling lens with said first aperture on said housing, and setting a focus of said sampling lens to be coplanar with said fiber coupling plane; causing said functional element to emit a laser beam, allowing said emitted laser beam to pass through said lens on said housing between said first and second apertures, so that a light spot is presented on said fiber coupling plane; measuring and adjusting size and/or position of said light spot on said fiber coupling plane in order to align said functional element in said second aperture of said housing; and fixing said aligned functional element to said housing, and completing other necessary assembling procedures to obtain said optical sub-assembly.