Dopant, coating, and grating effects in silica optical fibers under extreme neutron irradiation

Daniel C. Sweeney; Christian M. Petrie

doi:10.1016/j.jnoncrysol.2024.123228

Dopant, coating, and grating effects in silica optical fibers under extreme neutron irradiation

Daniel C. Sweeney, Christian M. Petrie

Advanced Fuel Fabrication and Instrument

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Radiation effects on fiber Bragg gratings (FBGs) have been studied but data gaps related to the effects of displacement damage resulting from high fast neutron fluence remain. In this work, Type-I and Type-II FBGs inscribed in optical fibers with various core dopants (Ge and F) and fiber coatings (acrylate, polyimide) were monitored in situ during 75 days of neutron irradiation to a peak fast (>0.1 MeV) neutron fluence of 3×10²¹ n_fast/cm². The reflected intensity of the Type-I FBGs inscribed in a Ge-doped core fiber decreased by >30 dB within 7 h of irradiation (10¹⁹ n_fast/cm²), whereas Type-II FBGs inscribed in a pure silica core fiber eventually approached >40 dB attenuation after accumulating a fast neutron fluence on the order of 10²⁰ n_fast/cm². Type-II FBGs inscribed in F-doped core fiber improved stability: the attenuation approached an equilibrium value in the range of 10 to 20 dB.

Original language	English
Article number	123228
Journal	Journal of Non-Crystalline Solids
Volume	646
DOIs	https://doi.org/10.1016/j.jnoncrysol.2024.123228
State	Published - Dec 15 2024

Funding

This research was sponsored by the Nuclear Science User Facilities Program of the US Department of Energy (DOE), Office of Nuclear Energy. Data curation was supported by the Advanced Sensors and Instrumentation Program of the US DOE, Office of Nuclear Energy. Neutron irradiation in HFIR was made possible by the US DOE, Office of Science. Shay Chapel, Padhraic Mulligan, Kurt Smith, David Bryant, Bob Sitterson, Adam James, Maureen Searles, and Nora Dianne Ezell contributed to the design, analysis, assembly, and operation of the irradiation experiment.

Keywords

Fiber Bragg gratings
Irradiation
Optical fiber sensors
Optical frequency domain reflectometry
Rayleigh scatter

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10.1016/j.jnoncrysol.2024.123228

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title = "Dopant, coating, and grating effects in silica optical fibers under extreme neutron irradiation",

abstract = "Radiation effects on fiber Bragg gratings (FBGs) have been studied but data gaps related to the effects of displacement damage resulting from high fast neutron fluence remain. In this work, Type-I and Type-II FBGs inscribed in optical fibers with various core dopants (Ge and F) and fiber coatings (acrylate, polyimide) were monitored in situ during 75 days of neutron irradiation to a peak fast (>0.1 MeV) neutron fluence of 3×1021 nfast/cm2. The reflected intensity of the Type-I FBGs inscribed in a Ge-doped core fiber decreased by >30 dB within 7 h of irradiation (1019 nfast/cm2), whereas Type-II FBGs inscribed in a pure silica core fiber eventually approached >40 dB attenuation after accumulating a fast neutron fluence on the order of 1020 nfast/cm2. Type-II FBGs inscribed in F-doped core fiber improved stability: the attenuation approached an equilibrium value in the range of 10 to 20 dB.",

keywords = "Fiber Bragg gratings, Irradiation, Optical fiber sensors, Optical frequency domain reflectometry, Rayleigh scatter",

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T1 - Dopant, coating, and grating effects in silica optical fibers under extreme neutron irradiation

AU - Sweeney, Daniel C.

AU - Petrie, Christian M.

PY - 2024/12/15

Y1 - 2024/12/15

N2 - Radiation effects on fiber Bragg gratings (FBGs) have been studied but data gaps related to the effects of displacement damage resulting from high fast neutron fluence remain. In this work, Type-I and Type-II FBGs inscribed in optical fibers with various core dopants (Ge and F) and fiber coatings (acrylate, polyimide) were monitored in situ during 75 days of neutron irradiation to a peak fast (>0.1 MeV) neutron fluence of 3×1021 nfast/cm2. The reflected intensity of the Type-I FBGs inscribed in a Ge-doped core fiber decreased by >30 dB within 7 h of irradiation (1019 nfast/cm2), whereas Type-II FBGs inscribed in a pure silica core fiber eventually approached >40 dB attenuation after accumulating a fast neutron fluence on the order of 1020 nfast/cm2. Type-II FBGs inscribed in F-doped core fiber improved stability: the attenuation approached an equilibrium value in the range of 10 to 20 dB.

AB - Radiation effects on fiber Bragg gratings (FBGs) have been studied but data gaps related to the effects of displacement damage resulting from high fast neutron fluence remain. In this work, Type-I and Type-II FBGs inscribed in optical fibers with various core dopants (Ge and F) and fiber coatings (acrylate, polyimide) were monitored in situ during 75 days of neutron irradiation to a peak fast (>0.1 MeV) neutron fluence of 3×1021 nfast/cm2. The reflected intensity of the Type-I FBGs inscribed in a Ge-doped core fiber decreased by >30 dB within 7 h of irradiation (1019 nfast/cm2), whereas Type-II FBGs inscribed in a pure silica core fiber eventually approached >40 dB attenuation after accumulating a fast neutron fluence on the order of 1020 nfast/cm2. Type-II FBGs inscribed in F-doped core fiber improved stability: the attenuation approached an equilibrium value in the range of 10 to 20 dB.

KW - Fiber Bragg gratings

KW - Irradiation

KW - Optical fiber sensors

KW - Optical frequency domain reflectometry

KW - Rayleigh scatter

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ER -

Dopant, coating, and grating effects in silica optical fibers under extreme neutron irradiation

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