以“内生安全光通信理论与技术研究”国家自然基金重点项目为研究背景，详细介绍了物理层密钥分发的3种现有技术方案。为了实现高速率与现有通信系统兼容的物理层密钥分发，提出了一种基于光纤信道特征的物理层密钥分发技术；基于光纤信道传输误比特率特性和密钥分发技术，发送端和接收端使用双端环回测量误比特率方式提取和量化生成密钥。研究结果表明:该技术实现了光纤传输速率为10 Gb/s的200 km距离传输，物理层安全协商密钥生成速率达到400 kb/s时，安全协商密钥误比特率不超过2%。

Based on the national natural fundkey project "Intrinsic security optical communication theory and technology research", three prior art solutions for physical layer key distribution are described in detail. In order to achieve high-rate physical layer key distribution compatible with existing communication devices, this paper proposes a physical layer key distribution technology based on fibre channel features. The transmitter and the receiver extract the quantized generation key by using the double-ended loopback measurement bit error rate method based on the fiber channel transmission bit error rate characteristic and key distribution technique. The research results show that the optical fiber transmission rate is 10 Gb/s and the transmission distance is over 200 km. When the physical layer secure key generation rate reaches 400 kb/s, the bit error rate of secure keys does not exceed 2%.