光纤光栅局部受温特性分析

应用传输矩阵法建立了光纤光栅局部受温时的反射谱变化模型,并进行仿真分析。理论分析表明：当光纤光栅某段所受温度瞬态变化时,其反射谱不再保持单个谐振峰,而是产生分裂点,且分裂点波长随温度的变化呈线性、周期性移动,同时给出了分裂点波长线性、周期变化的表达式。通过实验进一步研究,实验结果和理论分析相吻合。

Study on characteristic of fiber Bragg grating under local temperature

Based on the transfer matrix method, the reflective spectra model of the fiber Bragg grating under local temperature is established and analyzed by simulation. It shows that the reflective spectra of the fiber Bragg grating will split into two peaks when the fiber Bragg grating is under local instantaneous temperature. With temperature changed, the split point shifts linearly and periodically, and the corresponding expressions are obtained. The experimental consequents show agreement with the theoretical analysis.