中文摘要：

从耦合模理论出发,运用传输矩阵法对级联长周期光纤光栅（CLPG）的传输光谱进行了仿真分析,提出了基于CLPG的分布式光纤布拉格光栅（FBG）解调系统。该解调系统将级联长周期FBG作为边缘滤波器,利用它的4个线性区同时解调4个FBG的传感信号。仿真结果表明：在CLPG的线性范围内系统检测的光功率与传感FBG所受轴向应变成线性关系,最高能检测到5.813×10^-9的轴向应变传感信号。系统的应变灵敏度分别为-42.75,42.95,-43.15,43.35 m W/10^-6。

英文摘要：

Based on coupled-mode theory, transfer-matrix method Js used to simulate ancl analyze the transmission spectra of cascaded long-period fiber gratings （CLPG）, a kind of distributed demodulation system based on CLPG is proposed. The demodulation system uses CLPG as edge filter. Simulation results show that the optical power and the sensing FBG of system are linear in linear range of CLPG. The system can detect 5. 813 × 10 ^-9 axial strain sensing signal. The strain sensitivity of the system are -42.75,42.95. -43.15.43.35 mW/10 ^-6