Abstract
The gamma radiation induced loss spectra are recorded from 400 nm to 700 nm in high OH undoped silica core multimode step-index fibers having thin or thick cladding and polyimide or acrylate coating. For both coating materials, the better radiation resistance of thin-cladding fibers is observed. This behavior was reported in the past but not explained. A physical explanation is proposed on the basis of the assumed existence of peroxy-linkage precursors of the non-bridging oxygen hole centers (NBOHCS) and on the basis of a diffusion-limited radiation hardening due to radiolytic hydrogen released by the coating. Besides the radiation effects, an in-situ heating of the fibers performed after irradiation reveals a sensitivity of microbending losses to temperature.
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