针对通信窃听问题，以“内生安全光通信理论与技术研究”项目为研究背景，从信息层面、载波层面和调制后的信号层面，介绍了光纤物理层安全传输的现有技术发展。提出了一种基于量子噪声流加密的光纤物理层安全传输技术，将离散傅里叶变换扩展的正交频分复用(DFTs-OFDM)引入基于正交幅度调制(QAM)的量子噪声流加密传输系统，在保证高频谱利用率的同时，有效抵御非合作方的窃听。研究结果表明: 该传输技术实现了10 Gb/s的传输速率、无中继传输距离达300 km的光纤传输，且Q因子超过9，信息截获概率低于0.001%。

Aiming at the problem of communication eavesdropping, based on the research project of "research on self-secured optical communications theories and technologies", the existing technology development of fiber physical layer security transmission is introduced at the information level, carrier level and modulated signal level. This paper proposes a fiber physical layer secure transmission technology based on quantum noise stream cipher. The orthogonal frequency division multiplexing based on DFT-spread(DFTs-OFDM) is introduced into the quantum noise stream cipher transmission system based on quadrature amplitude modulation(QAM), which can effectively resist the eavesdropping of non-partners while ensuring high spectrum utilization. The research results show that the optical transmission rate of 10 Gb/s has no relay transmission distance of 300 km, and the Q factor exceeds 9, and the information interception probability is less than 0.001%.