Patent ID: 7998374

Claim:
A fabrication method of a self-written optical waveguide in which an optical waveguide is formed by irradiating curing light into a light curing resin liquid from an optical waveguide for introducing curing light and axially curing the light curing resin liquid in an optical axis direction, wherein a radiation pattern from the optical waveguide for said introducing curing light into the light curing resin liquid is adjustable, and a taper angle of a self-written optical waveguide to be formed is controlled in a range of from positive to negative values, and wherein a taper angle of a cured portion is measured in forming the self-written optical waveguide by using an image pickup device, the radiation pattern from the optical waveguide for said introducing curing light to the light curing resin liquid is adjusted according to the measured taper angle to control an increase or a decrease of the taper angle at a desired position of a self-written optical waveguide to be formed.