Optical axis adjustment method, manufacturing method, and optical axis adjustment device for integrated optical module

An optical axis adjustment device for an integrated optical module including, in a package, an optical demultiplexer that demultiplexes an incident light beam into a first light beam and a second light beam that have different wavelengths, and a first light receiving element and a second light receiving element that receive the first light beam and the second light beam, respectively, the optical axis adjustment device comprising:

• a stage on which the package with the first light receiving element and the second light receiving element mounted on the package is placed and fixed;
• a gripping means that grips, into the package, the optical demultiplexer including a first filter and a second filter;
• a light source that supplies the incident light beam;
• a current measurement instrument that detects the first light beam and the second light beam with the first light receiving element and the second light receiving element and acquires output currents from the detected light beams;
• and
• a PC unit that detects center wavelengths of the first light beam and the second light beam based on a wavelength of the incident light beam and the output currents, compares the center wavelengths of the first light beam and the second light beam with design transmission wavelengths of the first filter and the second filter, defines respective differences as a first wavelength deviation and a second wavelength deviation, and calculates a position of the optical demultiplexer to make a total sum of the first wavelength deviation and the second wavelength deviation small,
• wherein the gripping means moves the optical demultiplexer based on a calculation result of the PC unit.