基于放大自发辐射相位噪声的物理层密钥分发技术研究  

Research on Physical Layer Key Generation Based on the Phase Noise of Amplified Spontaneous Emission

作　　者：李皓然 周鹏威[1] 贾波[1] 赵栋[1] LI Haoran;ZHOU Pengwei;JIA Bo;ZHAO Dong(Department of Materials Science,Fudan University,Shanghai 200433,China)

机构地区：[1]复旦大学材料科学系,上海200433

出　　处：《复旦学报(自然科学版)》2025年第1期50-63,共14页Journal of Fudan University:Natural Science

摘　　要：提出并实验验证了一种基于放大自发辐射相位噪声的物理层密钥生成和分发技术。利用非平衡的马赫-曾德尔干涉仪构建了延迟自零差光路结构,将放大自发辐射相位噪声分发给通信双方,能够使双方获得高度一致的密钥信号,信号的相关系数达到0.905。在长度为50 km的标准单模光纤线路中使用优化后的后处理方法后,实现了4.983 Gb·s-1的零误码密钥分发速率。生成的密钥成功通过了随机性统计测试,表明密钥具有优异的随机性。该技术能够实现高速、安全的物理层密钥分发,为“一次一密”系统提供了一种简单、高效的解决方案。A physical layer key generation and distribution technique based on the phase noise of amplified spontaneous emission is proposed and experimentally verified.A delayed self-homodyne detection structure is constructed using an unbalanced Mach-Zender interferometer,and the phase noise of amplified spontaneous emission is distributed to the two users,which enables both users to obtain highly correlated key signals with a correlation coefficient up to 0.905.A key distribution rate of 4.983 Gb·s-1 with zero key error rate is achieved in a 50 km single-mode optical fiber by using the optimized post-processing method.In addition,the generated key successfully passes the randomness statistical test,indicating that the key has excellent randomness qualities.The proposed technique can realize high-speed and secure physical layer key distribution,and provides a simple and efficient solution for the one-time-pad system.

关 键 词：放大自发辐射 相位噪声 物理层密钥分发 

分 类 号：TN918[电子电信—通信与信息系统]