中文摘要：

基于Sagnac干涉环的基本原理,研究光缆识别系统。根据该系统探测距离、灵敏度、信噪比等指标,设计了光缆识别系统的激光发射模块（LD模块）、探测接收模块（PD模块）、FPGA信号处理模块。实验表明,LD模块的出光功率范围可达0~10mW,PD模块的光接收动态范围可达40dB。该系统在实际光缆识别过程中得到了良好的验证,本文重点介绍激光发射模块与探测接收模块。

英文摘要：

Based on the basic principle of Sagnac interference ring, a study on the optical cable recognition system is made. The designs of laser emission module （LD module） , detection and receiving module （PD module） and the FPGA signal processing module of the fiber optic identification system are given in term of system detection distance, sensitivity, signal to noise ratio and other parameters. Experiments show that the output frequency of the LD module can reach 0- 10mW and the dynamic range of the PD module can reach 40dB. The system has been well validated in the process of actual cable recognition. This paper focuses on the laser emission module and the detection and receiving module.