基于Φ-光时域反射计提出了一种超远程定位型全光纤周界安防系统方案。该传感器利用Φ-光时域反射计的干涉机理，从光纤中不同部分反射回来的瑞利散射光发生干涉，同时采用在分布式光纤传感器的多段传感光缆之间嵌入多级光中继放大传感装置。利用中继放大传感装置的增益克服了光纤损耗，增强了光纤中自发瑞利散射光的强度，传感光缆分段进行测量。当在多段传感光缆之间引入N个远程光中继放大传感装置进行级联时，可实现分布式光纤传感器的N×L(L为每段传感光纤长度)超远程监测。

A located super remote all optical fiber boundary safety guarding system solution based on Φ-optical time domain interference technology is proposed. Utilizing the interference mechanism of Φ-optical time domain reflectometer, the intervention occurs in the Rayleigh sacttering lights, which are reflected from the different parts of optical fiber. Meanwhile, the multi-stage optical repeating amplification sensing device is embedded among the multi-section sensing optical cables of the distributed optical fiber sensor, utilizing the gain of repeating amplification sensing device to overcome the optical fiber loss and to enhance the intensity of spontaneous Rayleigh scattering lights in optical fiber, and measuring the sensing optical cable by sections and time sharing. When N remote optical repeating amplification sensing devices being introduced among the multi-section sensing optical cables are cascaded, the systerm can bring the N×L (L is the length of each section sensing optical fiber) super remote monitoring of distributed optical fiber sensor.