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研究了光纤的辐照损伤机理,对纯硅芯光纤与传统芯层掺杂光纤的结构特点进行了系统地分析,从结构组成特点上分析了两者的抗辐照性能差异。研究了国内外关于光纤的抗辐照试验标准,对各标准中剂量率、总剂量等试验条件差异进行了对比,并对不同剂量率对光纤辐照试验结果的影响进行了分析,给出了光纤在空间辐照环境条件下应用的γ辐照试验条件的选择原则。最后,采用0.1 rad(Si)/s剂量率对某国产纯硅芯光纤的抗辐照性能进行了试验评估,光纤在20 k rad(Si)总剂量辐照后光纤损耗为1.934 d B/km。空间辐照性能评估结果满足该项目的宇航型号的空间环境使用需求,辐照评估结论为可用。
The radiation damage mechanism of optical fiber was studied. The structural characteristics of pure silica core fiber and conventional core doping fiber were systematically analyzed. The differences in their anti-radiation performance were analyzed based on their structural features. The standard of anti-radiation test for optical fibers at home and abroad was studied. The differences of the experimental conditions such as the medium dose rate, the total dose and so on were compared. The effects of different dose rates on the results of optical fiber irradiation were also analyzed. Selection Principle of γ Irradiation Test Conditions Applied to Optical Fiber Under Ambient Irradiation Environment. Finally, the radiation resistance of a domestic pure silica core fiber was evaluated with a dose rate of 0.1 rad (Si) / s. The optical fiber loss after a total radiation dose of 20 k rad (Si) was 1.934 d B / km . The results of the assessment of the space radiation performance meet the space environment requirements of the aerospace model of the project, and the conclusion of the radiation assessment is available.