Huang Peng, Song Qiuheng, Peng Hekuo, Huang Jingwei, Wu Hongyan, Xiao Qian, Jia Bo
Appl Opt. 2021 Jan 1;60(1):147-154. doi: 10.1364/AO.413171.
We propose a practical secure key generation and distribution (SKGD) scheme for actual application. Based on the experiment results of the polarization properties of the actual optical-fiber link, we propose a SKGD method by the active modulation of the state of polarization of the optical-fiber by two polarization scramblers placed at the local end of the legal users in the point-to-point communication system. Experiment results prove that the signals received by legal users share high correlation using 20 km standard single-mode fiber and 1 KHz polarization scrambling rate, and the bit generation rate can reach to 1216 bit/s with a bit error rate of ∼0.33. Security of the system is also analyzed in terms of the polarization properties of the system; the theoretical and experimental results indicate that the proposed scheme possesses high security due to the invisibility of the key signal and the technical difficulty of the recovery of the key sequence.
我们提出了一种适用于实际应用的实用安全密钥生成与分发（SKGD）方案。基于实际光纤链路偏振特性的实验结果，我们在点对点通信系统中，通过位于合法用户本地端的两个偏振扰码器对光纤偏振态进行主动调制，提出了一种SKGD方法。实验结果表明，使用20 km标准单模光纤和1 KHz偏振扰码率时，合法用户接收到的信号具有高度相关性，且误码率约为0.33时，比特生成率可达1216 bit/s。还从系统的偏振特性方面分析了系统的安全性；理论和实验结果表明，由于密钥信号的不可见性以及恢复密钥序列的技术难度，所提出的方案具有高度安全性。
