提出了一种新的光纤多防区周界传感系统，采用波分复用技术实现了监控防区和通道的扩展。该系统对传统采用单根传感光纤和反射镜的结构作了改进，并扩展了传感光纤的数量，将多根传感光纤分别置于监控领域内的不同防区，每个防区分别用不同中心波长的光纤布拉格光栅作为反射装置，使每根传感光纤工作在不同的波长。利用波分复用器件与技术，多根传感光纤共用一套干涉系统，实现了多个干涉子系统同时、独立的监测。实验结果表明，该系统可以实现多个分散防区同时、独立的入侵检测和定位，信号响应时间小于1 ms，不同防区间信号的串扰小于-20 dB。

A new multi-area perimeter sensing system based on optical fiber wavelength division multiplexing (WDM) technology is proposed and demonstrated. The traditional single channel system with broadband mirror is improved by introducing fiber Bragg grating (FBG) as the mirror, and the number of the monitoring areas is expanded by using the FBG with different reflecting wavelengths matching the demodulation channels of a WDM apparatus. The WDM and FBG technology employed in the system makes the measurement in each channel independent, simultaneous, no mutual-interfering between channels sharing the same interference device. The experimental results show that the proposed perimeter sensing system is able to detect and recognize the perturbation localization simultaneously in each area or channel. The response time of the system is less than 1 ms, and crosstalk between channels is less than -20 dB.