Optical transmission module and manufacturing method of the same

A manufacturing method for an optical transmission module which includes a first optical device arranged in an output side, a second optical device arranged in alignment with the first optical device with respect to their optical axes, a carrier on which either the first or the second optical device is fixed, an element support member including a first surface parallel to the optical axis and a second surface vertical to the optical axis, a package for housing the first and the second optical devices, the carrier, and the element support member, and a light guide unit for guiding light emitted from the first optical device to outside of the package, wherein the element support member is fixed on the carrier at the first surface thereof, and the other one of the first and the second optical devices is fixed at the second surface thereof, the method comprising:

• (1) fixing either the first or the second optical device on the carrier;
• (2) adjusting a position of the element support member while the other one of the first and the second optical devices closely contacts with the second surface of the element support member, and fixing the element support member on the carrier;
• and
• (3) aligning the first optical device and the second optical device with respect to those optical axes while the other one of the first and the second optical devices closely contacts with the second surface of the element support member, and fixing the other one of the first and the second optical devices on the second surface of the element support member.