Abstract

Radiation-induced attenuation (RIA) in fibers is investigated at $\lambda \,= \,{\text{1.55}}\,\mu\text{m}$ due to pulsed bremsstrahlung irradiation from an electron accelerator (mean photon energy of ∼5 MeV, pulse duration of ∼20 ns, doses of ∼3–76 Gy, time scale of ∼10^–9 to 5 × 10^–2 s). The fibers studied include three Ge-doped-silica-core fibers of different design and an undoped-silica-core fiber. The latter has been fabricated by an optimized technology to virtually fully suppress self-trapped holes and chlorine-associated RIA. RIA in Ge-doped fibers is found to increase with dose sublinearly with the power-law exponent in the range 0.69–0.96, although insufficient statistics (2–3 measurements for a fiber) do not allow us to state this with much confidence. The lowest RIA upon irradiation with high pulse doses (>20 Gy) is demonstrated by the undoped fiber; however, this RIA proved to be greater than that in a hollow-core photonic crystal fibers studied elsewhere. At smaller doses, RIA in the undoped fiber is estimated to amount just to a few dB/km at times $10^{- 3}- 10^{- 2}$ s. Therefore, optimized undoped fibers are argued to be the best-suited all-solid fiber type for practical applications under pulsed irradiation and combined pulsed and steady-state irradiations.

© 2016 IEEE

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