本文介绍了一种单模-多模-单模结构的本征型法布里-珀罗传感器,通过对传感器中渐变型多模光纤的光场分布进行分析和仿真,实现了传感器腔长的优化设计,大大降低了插入损耗,增强了传感器复用能力.实验证明串联复用中的单个传感器的优化后的插入损耗从4 d B减少至0.83 d B,多个级联复用时损耗变化平缓,温度测试结果表明级联的12个传感器均具有较好的灵敏度和线性度. In this paper, we introduce a single-mode-multimode-single-mode intrinsic Fabry-Perot sensor. By analyzing and simulating the light field distribution of the tapered multimode fiber in the sensor, the sensor cavity length The optimized design greatly reduces the insertion loss and enhances the sensor multiplexing ability.The experiments show that the optimized insertion loss of a single sensor in series multiplexing is reduced from 4 dB to 0.83 dB and the loss of multiple cascaded multiplexed Flat, temperature test results show that the cascaded 12 sensors have good sensitivity and linearity.