Fluorine doping in cladding, useful for minimizing the γ-ray-induced loss in multimode fibers with pure silica core, has been found to cause large γ-ray- induced loss in single-mode fibers. Radiation resistance of fluorine-doped silica seemed to be inferior to that of germanium-doped silica with the same refractive-index difference, |∆+| or |∆−|.

© 1985 Optical Society of America

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