Enhanced Radiation Resistance of Silica Optical Fibers Fabricated in High O $_{\bf 2}$ Excess Conditions
作者： Alexander L. Tomashuk , Mikhail Yu. Salgansky , Pavel F. Kashaykin , Vladimir F. Khopin , Albina I. Sultangulova
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摘要: Seven F-doped- and undoped-silica-core optical fibers were produced by the MCVD-method, ratio of O2 SiCl4 molar flow rates in vapor-gas mixture during fabrication perform core being varied among performs. The γ-irradiated to 8.1 kGy (0.75 Gy/s), radiation-induced absorption (RIA) measured after irradiation spectral range 1.1-1.7 μm. fiber loss spectra also γ-irradiation 1.31 MGy. Three RIA mechanisms affecting near-IR region have been revealed, namely, short-wavelength tails due Cl0-center self-trapped holes second type (STH2) a long-wavelength tail first (STH1). STH2 are argued result from strain frozen-in glass drawing process. STH 1 is shown anticorrelate with STH2. All revealed be strongly suppressed providing high excess synthesis. O2-excess technique therefore proposed as very promising one for development radiation-resistant fibers.
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