A new radiation-hard germano-silicate glass optical fiber with a pure silica glass buffer and a boron-doped silica glass inner cladding was fabricated for temperature sensor application based on the fiber Bragg grating (FBG) under γ-ray irradiation environment. The temperature dependences of optical attenuation at 1550.5 nm and Bragg reflection wavelength shift from 18 °C to 40 °C before the γ-ray irradiation were about 4.57×10⁻⁴ dB/ °C and 5.48 pm/ °C, respectively. The radiation-induced optical attenuation at 1550.5 nm and the radiation-induced Bragg reflection wavelength shift under the γ-ray irradiation with the total dose of 22.85kGy at 35 °C were about 0.03dB/m and 0.12nm, respectively, with the γ-ray irradiation sensitivity of 5.25×10⁻³ pm/Gy. The temperature and the γ-ray irradiation dependence of optical attenuation at 1550.5nm in the FBG written fiber with boron-doped silica glass inner cladding were about 6 times and 4 times lower than that in the FBG written fiber without boron-doped silica glass inner cladding under a temperature change from 18 °C to 40 °C and the γ-ray irradiation with the total dose of 22.85 kGy at 35 °C, respectively. Furthermore, the effect of temperature increase on the Bragg reflection wavelength of the FBG written fiber with boron-doped silica inner cladding was much larger about 1000 times than that of the γ-ray irradiation. However, no influence on the reflection power of the Bragg wavelengths and the full width at half maximum (FWHM) bandwidth under temperature and the γ-ray irradiation change was found. Also, after the γ-ray irradiation with the dose of 22.85kGy, no significant change in the refractive index was found but the residual stresses developed in the fiber were slightly relaxed or retained.

中文翻译：

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温度和伽马射线辐照对布拉格光栅内切抗辐射光纤光学特性的影响

基于γ射线辐照环境下的光纤布拉格光栅（FBG），制造了一种具有纯石英玻璃缓冲层和掺硼石英玻璃内包层的新型辐射硬锗酸硅玻璃光纤。在γ射线照射之前，在1550.5nm处的光学衰减和布拉格反射波长从18℃移至40℃的温度依赖性分别为约4.57×10 ^-4 dB /℃和5.48pm /℃。在35°C下总剂量为22.85kGy的γ射线照射下，1550.5 nm处的辐射诱导的光衰减和布拉格反射波长下的辐射诱导的布拉格反射波长偏移分别为γ时约0.03dB / m和0.12nm射线照射灵敏度为5.25×10 ^-3下午/ Gy。掺硼石英玻璃内包层的FBG写入光纤在1550.5nm处的光衰减的温度和γ射线辐射依赖性分别比不掺硼石英玻璃内层的FBG写入光纤的温度和γ射线辐照依赖性低6倍和4倍。在温度从18°C到40°C的条件下进行包覆，并在35°C时以22.85 kGy的总剂量进行γ射线照射。此外，温度升高对掺有硼的二氧化硅内包层的FBG写入光纤的布拉格反射波长的影响比对γ射线辐照的大得多，约为1000倍。然而，未发现在温度和γ射线照射变化下对布拉格波长的反射功率和半峰全宽（FWHM）带宽的影响。也，