Patent ID: 6760521
Filing Date: 2004-07-06
Classification: G02B

Abstract:
A wavelength correction method in a slab waveguide formed as one waveguide as a whole by combining two waveguide components with a predetermined end face which is so formed on one waveguide component as to cross an optical axis being placed to oppose an end face which is so formed on the other waveguide component so as to be parallel with the predetermined end face, or a slab waveguide assembly formed by connecting another waveguide to the slab waveguide, comprising:the first-wavelength-based measurement step of causing a light component having a first wavelength &lgr;1 shifted from a target center wavelength &lgr;g by a predetermined wavelength to be incident from the waveguide component placed on an incident side, and at the same time, measuring a level of a light component output at each movement position while moving at least one of the two waveguide components in a direction crossing the optical axis; the second-wavelength-based measurement step of causing a light component having a second wavelength &lgr;2 symmetrical to the first wavelength &lgr;1 with respect to the center wavelength &lgr;g to be incident from the waveguide component placed on the incident side, and at the same time, measuring a level of a light component output via the two waveguide components at each movement position while moving at least one of the two waveguide components in the direction crossing the optical axis; the coincident position discrimination step of discriminating a relative movement position of the two waveguide components at which the level of the light component obtained in the first-wavelength-based measurement step coincides with the level of the light component obtained in the second-wavelength-based measurement step; and the final correction step of fixing a positional relationship between the two waveguide components in the direction crossing the optical axis to the relative movement position discriminated in the coincident position discrimination step in order to complete correction for the center wavelength &lgr;g.