Coexistence of Discrete-Variable QKD with WDM Classical Signals in the C-Band for Fiber Access Environments
Coexistence of Discrete-Variable QKD with WDM Classical Signals in the C-Band for Fiber Access Environments
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光纤接入环境中 C 频段离散变量 QKD 与 WDM 经典信号的共存
DOI：
10.1109/icton.2019.8840255
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
H. Avramopoulos
中科院分区：
文献类型：
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作者：
D. Zavitsanos;G. Giannoulis;A. Raptakis;Christos P. Papapanos;Fotini Setaki;H. Theodoropoulou;G. Lyberopoulos;C. Kouloumentas;H. Avramopoulos
从理论上研究了无源光网络(PON)拓扑中离散变量量子密钥分发(DV-QKD)与四个双向经典信道共存的方案。该研究旨在探索考虑弱量子信道与通过共享光纤基础设施的经典流的真实业务流共存时所施加的限制。基于一种即插即用的相位编码DV-QKD实现，我们对光纤距离达10公里时的QBER和安全密钥率进行了数值模拟。已报道的结果表明，在固定的C波段网格中，在密集网格中，经典通道和量子通道之间的光谱隔离是必不可少的。通过更强的光谱隔离来消除泄漏噪声，与拉曼散射相关的光子成为主要的噪声源，因为这种机制覆盖了一个超宽带窗口，并且随着传输距离的增加而变得更强。
In this paper, a coexistence scheme between a Discrete-Variable Quantum Key Distribution (DV-QKD) and four bidirectional classical channels in a Passive Optical Network (PON) topology is theoretically investigated. The study aims to explore the imposed limitations considering the coexistence of weak quantum channels with realistic traffic flows of classical streams through shared fiber infrastructures. Based on a ‘plug and play’ phase coding DV-QKD implementation, we conducted numerical simulations of the QBER and the secure key rate for fiber distances up to 10 km. The reported results suggest that in a fixed C-band grid, the spectral isolation between classical and quantum channels is essential at dense grids. By removing the leakage noise through stronger spectral isolation, the photons linked with the Raman scattering become the dominant noise source, since this mechanism covers an ultra-broadband window and gets stronger as the propagation distance increases.