Patent ID: 6519389
Filing Date: 2003-02-11
Classification: G02B

Abstract:
A method of making a diffraction grating device, in which an optical waveguide is irradiated, by way of a phase grating, with refractive index modulation inducing light capable of inducing a refractive index modulation in an optical waveguide region of said optical waveguide so as to form a diffraction grating in said optical waveguide region, said method comprising:a diffraction efficiency distribution measuring step of measuring a diffraction efficiency distribution of said phase grating; and a refractive index modulating step of irradiating said optical waveguide with said refractive index modulation inducing light by way of said phase grating with an amount of irradiation of said refractive index modulation inducing light at each position on said phase grating being adjusted according to said diffraction efficiency distribution measured in said diffraction efficiency distribution measuring step, so as to modulate a refractive index of said optical waveguide region.