OPTICAL FIBER

摘要

PURPOSE:At least one of the core and the clad of an optical fiber in which at least the core is composed of quartz is doped with GeO2 and F to improve the hydrogen resistance and radiation resistance of the optical fiber. CONSTITUTION:In the above-mentioned doping, the concentration of GeO2 is lower than 12mol% and the concentration molar ratio of GeO2 to F is more than 4. The effect cited above is similarly obtained in an optical fiber which is composed of quartz in both the core and the clad.