为保护光纤光栅, 提出了一种镀层和光纤光栅结合良好的无粗化过程的化学镀和电镀保护方法.基于应力分析法, 得到镀镍光纤光栅的温度灵敏度公式, 采用ANSYS有限元软件分析了电镀后光纤光栅应力随温度变化关系, 并进行了实验证实.结果表明: 光纤光栅电镀后温度灵敏度理论和实验值分别为20.6951 pm/℃、22.076 pm/℃.理论分析和实验、仿真结果基本一致.相比裸光纤光栅, 温度灵敏度增加到原来的2.2倍.该方法不仅可以获得厚度理想的保护层, 还可以提高光纤光栅的温度灵敏度.

In order to protect Fiber Bragg Grating (FBG), a non-coarsening fiber surface electroless plating and electroplating technics with good adhesion force between layer and fiber was proposed. Based on stress analysis, the temperature sensitivity of protected FBG was achieved in theory, the stresses on the protected FBG under varied temperatures were analyzed by a finite element analysis software (ANSYS) and verified by experiment. The results show that the temperature sensitivity of protected FBG is 20.6951 pm/℃ theoretical and 22.076 pm/℃ from the experiments, which the results of theoretical analysis match the ones from experiments and simulations very well. The temperature sensitivity is 2.2 times as much as that of bare FBG. The desirable thickness of metallic protect layer can be obtained and the temperature sensitivity can be improved.