Takahiro Matano

Temperature Dependence of B- and F-Doped SiO2 Waveguide Bragg Grating on a Crystallized Glass Substrate

A boron and fluorine doped SiO2 slab waveguide with a surface-relief Bragg grating of 0.53 µm period was fabricated on a crystallized glass substrate with a thermal expansion coefficient of -2.8 ×10-6 /°C by plasma-enhanced chemical vapor deposition. A thermal shift of the Bragg wavelength as low as 3 pm/°C was obtained for TE0 mode in a 13B2O3-87SiO2 (mol%) core and 3F2-11B2O3-86SiO2 (mol%) cladding waveguide, which was about one-fourth of the value obtained for a conventional Ge-SiO2 waveguide. The polarization dependence of the temperature sensitivity of the Bragg wavelength was theoretically analyzed.

Less temperature-sensitive F-B-SiO/sub 2/ waveguide on a crystallized glass substrate

A F-B-SiO/sub 2/ slab waveguide Bragg grating is fabricated on a multi-component crystallized glass substrate. A thermal shift of the Bragg wavelength as low as 3 pm/K, which is /spl sim/ 1/4 of a conventional device, is achieved.