Pulsed-Bremsstrahlung-Radiation Effect on Undoped- and Ge-Doped-Silica-Core Optical Fibers at Wavelength of 1.55 μm

Radiation-induced attenuation (RIA) in fibers is investigated at λ = 1.55 μm 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-dop...

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Bibliographic Details
Published in:Journal of lightwave technology 2017-06, Vol.35 (11), p.2143-2149
Main Authors: Tomashuk, Alexander L., Filippov, Alexey V., Moiseenko, Alexander N., Bychkova, Ekaterina A., Tatsenko, Olga M., Zavialov, Nikolay V., Grunin, Anatoly V., Batova, Ekaterina T., Salgansky, Mikhail Yu, Kashaykin, Pavel F., Azanova, Irina S., Tsibinogina, Marina K., Levchenko, Andrey E., Guryanov, Alexey N., Dianov, Evgeny M.
Format: Article
Language:English
Subjects:
Bremsstrahlung
Chlorine
Crystal fibers
Doped fibers
Germanium
Optical fiber
Optical fiber networks
Optical fiber polarization
Optical fiber sensors
Optical fibers
Photonic crystals
Pulse duration
pulsed irradiation
Radiation
Radiation effects
radiation resistance
radiation-induced attenuation (RIA)
Silicon compounds
Silicon dioxide
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Summary:Radiation-induced attenuation (RIA) in fibers is investigated at λ = 1.55 μm 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.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2016.2623359