一种新型光纤光缆窃听及监测技术研究

Study on a new fiber-optic cable tapping and detection technology

文章首先通过推导弯曲损耗系数的理论公式,分别考察了弯曲窃听的两类影响因素;然后在此基础上设计了窃听系统框架结构,搭建了光纤窃听实验系统,实现了隐蔽窃听,而且得到了实现弯曲窃听的最佳弯曲半径;最后,针对该隐蔽窃听的特征并利用相同条件下长波长弯曲损耗比正常的通信波长大得多的特点,提出了灵敏度更高的有效窃听监测方法。

Two factors affecting covert tapping are first investigated by deducing the fiber bending loss formula. Then on this basis, the framework of the tapping system is designed, a fiber-optic experimental tapping system set up, covert tapping realized and the optimal bending radius value for realizing covert tapping gained. Finally, considering the features of covert tapping, and making use of the fact that the bending loss of long wavelength signals are much greater than that of normal communication wavelength signals under the same conditions, an effective tap detection method is proposed with improved system detection sensibility.