We propose a secure key distribution (SKD) based on local polarization modulation driven by optical chaos in a reciprocal fiber link. A robust error-free SKD with a key generation rate of 4.3 Gbit/s over transmission of 10-km standard single-mode fiber is experimentally demonstrated. A chaotic laser system shared by legitimate users serves as an external wideband entropy source. The polarization reciprocity of the fiber channel provides fundamental safety against eavesdropping. The robustness of SKD resulted from local chaotic polarization modulation is also theoretically analyzed and then verified by practical performance. The proposed scheme is an alternative SKD strategy with high speed and strong security.

中文翻译：

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互易光纤通道中光混沌驱动的局部偏振调制高速安全密钥分发

我们提出了一种基于由互易光纤链路中的光学混沌驱动的本地偏振调制的安全密钥分发 (SKD)。实验证明了一种稳健的无差错 SKD，其密钥生成速率为 4.3 Gbit/s，通过 10 公里标准单模光纤传输。合法用户共享的混沌激光系统作为外部宽带熵源。光纤通道的极化互易性为防止窃听提供了基本的安全性。还从理论上分析了局部混沌偏振调制导致的 SKD 的鲁棒性，然后通过实际性能进行验证。所提出的方案是一种具有高速和强安全性的替代SKD策略。