Method for adjusting transmitted wavelength of signal light transmitted through optical waveguide device

A method for adjusting a transmission wavelength of signal light transmitted through an optical waveguide device that is provided with one or more optical waveguides through which the signal light having a wavelength of 1520 nm to 1560 nm and blue light having a wavelength of 375 nm to 455 nm pass, a groove through which the optical waveguide passes, and resin filled in the groove, comprising:

• a step of entering the signal light and the blue light into the same or mutually different resin via the same or mutually different one or more optical waveguides, the step being a step of changing a refractive index of the resin by irradiating the resin with the blue light so as to change the transmission wavelength of the signal light transmitted through the resin in accordance with a change in the refractive index of the resin;
• and
• a step of adjusting a speed at which the transmission wavelength of the signal light passing through the resin changes in accordance with a change in the refractive index of the resin such that a time required to shift the transmission wavelength of the signal light becomes shorter by adjusting an output of a light source for blue light that generates the blue light.