O2-Loading Treatment of Ge-Doped Silica Fibers: A Radiation Hardening Process

Franco Mario Gelardi, Antonino Alessi, Simonpietro Agnello, Diego Di Francesca, Sylvain Girard, Diego Di Francesca, Philippe Paillet, Aziz Boukenter, Youcef Ouerdane, Claude Marcandella, Antonino Alessi

Risultato della ricerca: Articlepeer review

17 Citazioni (Scopus)


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.
Lingua originaleEnglish
pagine (da-a)2311-2316
Numero di pagine6
RivistaJournal of Lightwave Technology
Stato di pubblicazionePublished - 2016

All Science Journal Classification (ASJC) codes

  • ???subjectarea.asjc.3100.3107???


Entra nei temi di ricerca di 'O2-Loading Treatment of Ge-Doped Silica Fibers: A Radiation Hardening Process'. Insieme formano una fingerprint unica.

Cita questo