Patent ID: 8079125

Claim:
A method for manufacturing an optical module, the method comprising the steps of: preparing a package with an optical element mounted thereon, a transparent plate having a function for transmitting an optical signal to the optical element, engagement pins, a first member having through-holes with which the engagement pins can be engaged and an opening or a transparent plate through which an optical signal can pass, a micro-lens array plate having grooves or through-holes in which the engagement pins can be inserted, two planes parallel to each other for inputting or outputting an optical signal, and micro lenses arranged on at least one of the planes such that the micro lenses are arranged on a surface of the micro-lens array plate that faces the optical element; sealing the package by using the transparent plate and a fixing member; passing the engagement pins through the first member to engage the engagement pins with the first member; and engaging portions of the engagement pins that have passed through the first member with the grooves or through-holes of the micro-lens array plate; and optically aligning the micro-lens array plate with the optical element.