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利用保偏光纤受外界干扰时主轴变化 ,从而传输光的偏振度发生变化 ,以传输光的偏振度为敏感参数 ,实时检测介入窃听 ,给编码保密通信增加了一个保密度。以光纤被弯曲的半径来定义窃听检测阈值 ,典型阈值是 8 5mm。
The polarization of the transmitted light changes with the change of the principal axis when the polarization maintaining fiber is disturbed by the outside world. The degree of polarization of the transmitted light is used as the sensitive parameter to detect the interception eavesdropping in real time, which adds a degree of confidentiality to the encoded secure communication. The eavesdrop detection threshold is defined as the radius at which the fiber is bent, with a typical threshold of 8 mm.