Germanium oxide doped silica optic fibre for fibre Bragg grating

摘要

An optical fiber for use in a fiber Bragg grating, includes a core 21 made of a material obtained by adding germanium oxide (GeO 2 ) to silica (SiO 2 ), for guiding light, and a cladding 23 made by adding a material having a negative thermal expansion coefficient to silica (SiO 2 ), the cladding having a refractive index lower than that of the core. The material may be ZrO 2 or TiO 2 . B and F may also be added to the cladding 23. An inner cladding 22 of silica may be present.