METHOD FOR CONTROLLING POLARIZATION CHARACTERISTIC AND PROPAGATION CONSTANT AND METHOD FOR MANUFACTURING RING RESONATOR, OPTICAL WAVEGUIDE, WAVEGUIDE OPTICAL DEVICE AND VARIOUS KIND OF OPTICAL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a new method for controlling polarization characteristics and propagation constant by which the polarization characteristics and the propagation constant of a ring resonator or the like can be easily controlled and independence on polarization can be realized.;SOLUTION: In the method for controlling the polarization characteristics or propagation constant of a ring resonator, optical waveguide or waveguide type optical device, a polyimide film the film thickness of which can be decreased by irradiation of UV rays while keeping the refractive index and double refraction constant is used for the upper clad. The film thickness of the upper clad is controlled by irradiation of UV rays.;COPYRIGHT: (C)2001,JPO