城域网中量子与经典光共纤传输技术研究  

Research On Coexistence Of Quantum and Classical Signals In One Fiber In Metropolitan Area Network

作　　者：张平[1] 罗广军[2] 许华醒 王昌雷 王少华 ZHANG Ping;LUO Guang-jun;XU Hua-xing;WANG Chang-lei;WANG Shao-hua(China Academy of Electronics and Information Technology,Beijing 100041,China;The 34^(th) Research Institution of China Electronics Technology Group Corporation,Guilin 541004,China)

机构地区：[1]中国电子科学研究院,北京100041 [2]中国电子科技集团公司第三十四研究所,广西桂林541004

出　　处：《中国电子科学研究院学报》2021年第11期1150-1155,共6页Journal of China Academy of Electronics and Information Technology

基　　金：国家自然科学基金青年科学基金项目(62001440)。

摘　　要：基于光纤信道的量子密钥分发(QKD)方案,为了避免经典光信号对量子信号的干扰,量子通信通常额外使用独立的光纤来进行传输,这就造成了对光纤资源的大量消耗,实现量子与经典光共纤传输是QKD走向实用化的重要途径。城域网是QKD应用的主要场景之一,文中针对城域网量子与经典光信号共纤传输应用,开展了系统的理论建模和仿真分析,详细研究了经典光信号与量子光信号同向传输和反向传输、传输距离、经典光信号功率等对QKD误码率和成码率的影响。仿真结果显示:基于BB84协议,当经典信号光功率为10 dBm时,量子光信号与经典光信号同向共纤传输系统的最大传输距离可达到85.5 km,验证了量子与经典光信号共纤传输系统在城域网应用是可行的。In the fiber-based quantum key distribution(QKD) schemes, the quantum signals usually occupy an individual fiber to avoid the crosstalk of classical signals, which is a waste of scarce fiber resources. Therefore, coexistence of quantum and classical signals in one fiber is a key way for the practical QKD implement. As the Metropolitan Area of Network(MAN) is the main application scenario for QKD, a scheme for the coexistence of quantum and classical signals in one fiber in MAN is proposed in this paper. The noise introduced by the classical signals for the quantum signals is modeled and evaluated. The simulation results verifies the feasibility of the coexistence of quantum and classical signals in one fiber in MAN. Using the BB84 protocol, the maximal transmission distance of the coexistence of quantum and classical signals can achieve 85.5 km while the power of the classical signals is set to 10 dBm.

关 键 词：量子密钥分发 量子通信 经典通信 共纤传输 拉曼散射 

分 类 号：O431.2[机械工程—光学工程]