Patent ID: 8824056

Claim:
A method for manufacturing an optical device, the method comprising: forming on a substrate a set of at least one waveguide collectively having first and second segments, the first segment being constructed such that first irradiation of the first segment changes an average of refractive indices of extraordinary and ordinary optical axes in the first segment, and also changes birefringence in the first segment, the change in birefringence due to the first irradiation being a first non-zero function f a of the change in average refractive index due to the first irradiation, the second segment being constructed such that second irradiation of the second segment changes an average of refractive indices of extraordinary and ordinary optical axes in the second segment, and also changes birefringence in the second segment, the change in birefringence due to the second irradiation being a second non-zero function f b of the change in average refractive index due to the second irradiation, the first and second functions being different; irradiating a first predetermined length of the first segment with the first irradiation; and irradiating a second predetermined length of the second segment with the second irradiation.