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分析了布拉格光纤光栅纤芯折射率和光栅反射率随温度和时间变化的规律 ,应用有关模型提出了加速衰变的概念 ,并由此建立了相关退火工艺。利用衰变曲线可预测光栅在给定时间和温度下的特性 .理论和实验结果相吻合。
The regularity of the refraction index and grating reflectivity of Bragg fiber grating with temperature and time are analyzed. The concept of accelerated decay is put forward based on the model, and the related annealing process is established. The decay curve can be used to predict the grating’s behavior at a given time and temperature. The theoretical and experimental results are in good agreement.