为了研究光子带隙光纤在1550nm波长下受径向压力的影响, 采用有限元法做仿真计算进行了定量研究, 并通过搭建实验系统对比分析了实测与仿真计算结果的差异。结果表明, 限制损耗随径向压力变化的灵敏度为0.00067(dB/km)/(N/m), 归一化分界面场强F参量随径向压力的变化率为0.68×10-6/(N/m), 折射率随径向压力的变化率为1.0×10-8/(N/m)。该研究为光子带隙光纤在光纤传感领域的应用提供了一种实验分析途径。

In order to analyze the influence of radial pressure on the characteristics of a photonic bandgap fiber in 1550nm transmission band, both the limiting loss and refractive index of the photonic bandgap fiber caused by the radial pressure were calculated by using finite element method (FEM). In addition, the differences between simulation and measurement were also compared and analyzed through experiments. The results show that FEM sensitivity of limiting loss of photonic bandgap fibers varying with the change of radial pressure is 0.00067(dB/km)/(N/m), the change rate of the F parameter with the change of radial pressure is 0.68×10-6/(N/m) , and the change rate of the refractive index with the change of radial pressure is 1.0×10-8/(N/m). The study about transmission characteristics of photonic bandgap fibers under radial pressure will support an experiment foundation for fiber optical sense in long wavelength band applications.