均匀光纤布拉格光栅横向受力特性的理论分析

对均匀光纤布拉格光栅(FBG)中间一段横向受力特性在仿真的基础上作了理论和实验研究。采用传输矩阵法分析了光纤布拉格光栅中间一段横向受力时的反射谱变化,并且基于传输矩阵法进行了数学推导。当光纤布拉格光栅中间一段受到横向力时,反射谱的反射峰发生分裂,并且分裂点随受力大小的变化呈线性、周期性的移动。给出了线性表达式,分裂点以11.06 N为周期在光纤布拉格光栅的全波带宽内移动,周期内分裂点波长漂移相对于受力的灵敏度约为带宽与周期的比值,周期大小与受力光栅长度无关。给出了详细的理论分析、仿真结果和实验图谱,实验结果与仿真效果一致。

Theoretical Analysis of Fiber Bragg Grating Characterization by Applying Transverse Force

Fiber Bragg grating(FBG) characteristics by applying a transverse force to a middle section were studied theoretically and experimentally.A numerical simulation based on the transfer matrix method was used to calculate the consequent changes in reflection spectrum.The reflection spectra of the FBG subjected to the transverse force split into two main peaks,and the split point shifted linearly and periodically with the applied force.The linearity expression was presented.The split point was shifted within the bandwidth with the period of(11.06 N,) and in one period the sensitivity of the split point wavelength shift versus the applied force was the ratio of bandwidth to the period,the period was independent of the length under stress.The theory analysis,simulation results and experimental consequents were presented.The experimental consequents were in good agreement with the simulation results.