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Gamma-ray radiation effects on hydroxyl absorption increase in optical fibers

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3 Author(s)
H. Itoh ; NTT Electrical Communications Laboratories, Tokai Ibaraki, Japan ; Y. Ohmori ; M. Nakahara

This paper presents gamma-ray irradiation effects on OH-loss increase due to the chemical reaction of H2for GeO2-doped and GeO2. P2O5-doped fibers. When H2diffuses into irradiated fibers (γ-H2treatment), OH-loss increase occurs even at room temperature. Moreover, OH-loss increases due to dissolved H2in irradiated fibers are larger than those in unirradiated fibers at high temperatures. These OH-loss increases are attributed to irradiation-induced defects with which H2reacts to form OH ions. When H2-dissolved fibers are irradiated, the OH-loss increases are larger than those in the γ-H2-treated fibers at room temperature. These larger loss increases are thought to be caused by the reaction of the unstable radical and dissolved H2, which are excited by the irradiation.

Published in:

Journal of Lightwave Technology  (Volume:4 ,  Issue: 4 )