保偏型光纤传感器解调系统仿真与参数优化

Simulation and Parameter Optimization of the Polarization Maintaining Fiber Optic Sensor Demodulation Systems

研究了光纤布拉格光栅传感器的波长解调原理和保偏光纤环镜的结构及传光原理,分析了输入光波长和输出光功率的分配特性,提出了一种基于保偏光纤环镜的光纤布拉格光栅传感解调方案,应用Matlab7.0进行仿真分析,验证了理论的正确性,运用Optisystem7.0进行光路测试及参数测定充分验证了解调方案的可行性.最后给出了该解调模型中保偏光纤长度、耦合器耦合系数及两偏振态相位差等参数的最优设置范围.

The wavelength demodulation principle of Bragg grating sensor and the structure of polarization maintaining fiber loop mirror were studied. After analyzing the distribution characteristics of the input light wavelength and the output power, it designed a fiber Bragg grating sensor demodulation scheme based on polarization maintaining fiber loop mirror. Matlab7.0 simulation was applied to verify the correctness of the theory; parameters and optical path were tested by Optisystem7.0 to fully verify the feasibility of the demodulation scheme. Finally, it gave the optimal range of the polarization maintaining fiber length, the coupling coefficient of coupler and the polarization maintaining fiber spindle angle in this model.