Patent ID: 6975800
Filing Date: 2005-12-13
Classification: C03B,C03C,G02B

Abstract:
1. An optical waveguide having a core material and a cladding material, each of fused silica, wherein the difference between respective linear thermal expansion coefficients of the core material and the cladding material is selected by doping at least one of the core material and the cladding material using at least one foreign substance so that inner mechanical stresses produced in the optical waveguide by manufacturing process are reduced, wherein at least one of the core material and the cladding material is doped using at least one of a first foreign substance and a second foreign substance in such a way that a first ratio of chance in refractive index to change in linear thermal expansion coefficient produced by a doping using the first foreign substance is different from a second ratio of change in refractive index to chance in linear thermal expansion coefficient produced by a doping using the second foreign substance, wherein fluorine and GeO