Abstract
A germano-silicate glass optical fiber with inner cladding layers of pure silica buffer and boron-doped silica was fabricated to enhance photosensitivity of fiber Bragg grating (FBG) maintaining the radiation resistance for sensing applications. The gamma-ray dose-rate dependence on the radiation-induced attenuation (RIA) and the peak shift of the FBG inscribed in the core of the fiber was investigated. As the γ-ray irradiation on the fiber with the FBG increased to 22.86 kGy/h, the reflected peak power increased together with small temperature increase but the transmitted power at 1550 nm decreased. While the Bragg reflection wavelengths were shifted toward longer wavelengths during the γ-ray irradiation, the FWHM bandwidth remained unchanged. The Bragg peak shift of the FBG was found to saturate at a 78 pm level and the RIA of 1.345 dB/m at 1550 nm was obtained with the accumulated dose-rate of 22.86 kGy/h.
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Acknowledgements
This work was partially supported by the New Growth Engine Industry Project of the Ministry of Trade, Industry and Energy, Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (No. 2013R1A1A2063250), the Korea government (MSIP) (No. 2011-0031840), the Brain Korea-21 Plus Information Technology Project through a grant provided by the Gwangju Institute of Science and Technology, South Korea.
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Ju, S. et al. (2016). Gamma-Ray Dose-Rate Dependence on Radiation Resistance of Specialty Optical Fiber with Inner Cladding Layers. In: Ribeiro, P., Raposo, M. (eds) Photoptics 2014. Springer Proceedings in Physics, vol 177. Springer, Cham. https://doi.org/10.1007/978-3-319-27321-1_5
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DOI: https://doi.org/10.1007/978-3-319-27321-1_5
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