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Article Dans Une Revue Journal of Lightwave Technology Année : 2016

O2-loading treatment of Ge-doped silica fibers: a radiation hardening process

Diego Di Francesca
Sylvain Girard
Antonino Alessi
Philippe Paillet
  • Fonction : Auteur
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Aziz Boukenter
Youcef Ouerdane

Résumé

The effects of a high-pressure O2-loading treatment on the radiation response of Ge-doped optical fibers (OFs) were investigated. We found that the incorporation of high concentration of interstitial molecular oxygen remarkably enhances the resistance to ionizing radiation of Ge-doped OFs in the UV-Visible domain and, at the same time, improves the transmission of UV light in the unirradiated OF sample. By comparison with previously reported results, the O2-loading treatment turned out to increase the radiation resistance of Ge-doped OFs more efficiently than F or Ce codoping. The understanding of such amelioration relies in basic radiation-induced mechanisms that were characterized with three complementary experimental techniques: Confocal microluminescence (CML), online radiation-induced attenuation (RIA), and electron paramagnetic resonance (EPR). We have shown that the almost intrinsic oxygen-deficient character of germanosilicate fibers can be overturned by forcing O2 diffusion in the glass matrix. The Germanium lone pair centers, which are precursor defects invariantly present in the as-drawn Ge-doped OFs, are converted to some other yet-undetermined species. Consequently, the usual chain of radiation-activated processes leading to the creation of Ge(1) and Ge(2) is substantially suppressed. The experiments have also highlighted an increased production of oxygen-excess related defects under irradiation. Although in terms of RIA, the tradeoff between the oxygen-excess and oxygen-deficient defects is already a positive one, it is conceivable that the radiation resistance of Ge-doped OFs can be further improved by optimizing the O2-loading treatment.
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Dates et versions

hal-01528198 , version 1 (27-05-2017)

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Citer

Diego Di Francesca, S. Agnello, Sylvain Girard, Antonino Alessi, Claude Marcandella, et al.. O2-loading treatment of Ge-doped silica fibers: a radiation hardening process. Journal of Lightwave Technology, 2016, 34 (9), pp.2311 - 2316 ⟨10.1109/JLT.2016.2533670⟩. ⟨hal-01528198⟩
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