一种新的光缆窃听系统研究

Research on a Novel Fiber Cable Tapping System

基于光纤弯曲辐射,提出了四步光缆窃听法,即"剥光缆,弯光纤,取信号,解信息"。通过推导光纤弯曲损耗公式和考察两类窃听影响因素,得出隐蔽窃听所需的光纤弯曲最佳曲率半径值。在此理论指导下,设计了窃听系统框架结构,并搭建了光纤窃听实验系统。经理论和实验证明:四步光缆窃听法具有可行性,且隐蔽性好、检测难度大。

Based on optical fiber- bending radiation, four steps method for optical cable tapping, bending the optical fiber, collecting optical signals and demodulating information are proposed. By deducing the fiber - bending loss formula and seeing about two types tapping determinants,the optimal value of bending radius for covert tapping is gained. With guidance of the theory,structure of tapping system is＇ designed and experimental platform for tapping is built. Theory and experiment are proved the feasibility of four steps method, and it is very covert and hard to detect.