Patent ID: 6192712
Filing Date: 2001-02-27
Classification: C03B,G02B,Y02P

Abstract:
A method for fabricating an optical waveguide, comprising the steps of:a) forming an optical waveguide on the surface of a substrate via an atmospheric pressure chemical vapor deposition method using a silica raw material containing an organic material; andb) irradiating ultraviolet light on at least a portion of the optical waveguide, wherein the organic material is formed from a combination of a silicon-based organic compound, a phosphorous-based organic compound, and a germanium-based organic compound, andwherein the step of forming the optical waveguide comprises the following substeps:a1) forming a first cladding layer and a core layer using the atmospheric pressure chemical vapor deposition method;a2) annealing the first cladding layer and the core layer at a temperature of between 600.degree. C. and 800.degree. C. to remove moisture therein; anda3) forming a second cladding layer directly on the first cladding layer using the atmospheric pressure chemical vapor deposition method,wherein the irradiating step results in the irradiated portion of the optical waveguide having a different refractive index as compared to a non-radiated portion of the optical waveguide,wherein the ultraviolet light is provided as a series of pulsed light beams onto the portion of the optical waveguide during the irradiating step.