量子信号与经典光信号共纤传输中的噪声抑制技术

doi:10.11959/j.issn.1000-0801.2018257

摘要/Abstract

摘要：

目前基于光纤的点对点量子密钥分配所需的器件和系统技术正逐步成熟并呈现商业化应用趋势，因此如何将量子信号和经典光信号复用在一根光纤中以大幅提高系统容量和节约光纤资源成为学术界近年来关注的热点问题之一。主要研究了量子信号与经典光信号共纤传输中的噪声抑制问题，首先分析四波混频和拉曼散射这两种主要噪声因素对量子信道产生的影响；然后针对不同信道间隔和不同传输距离的应用场景分别提出了一种基于非等间隔波长分配的四波混频噪声抑制算法以及一种针对四波混频和拉曼散射进行联合优化的波长分配算法；最后采用仿真验证了所提算法的性能优越性，为未来不同应用场景下的量子信号与经典光信号共纤传输提供了良好的技术方案。

关键词: 量子密钥分配, 共纤传输, 四波混频, 拉曼散射, 噪声抑制, 波长分配

Abstract:

At present,the technologies of device and system required for the fiber-based point-to-point quantum key distribution (QKD) are gradually becoming mature and showing the trend of commercial application.Therefore,how to multiplex quantum signals and classical optical signals in a single fiber to greatly increase the capacity and save fiber resources has been becoming one of the hotspots of academia in recent years.The noise impairments in the co-propagation of quantum signals and classical optical signals over a single fiber were mainly studied.Firstly,the influences of the main noises,four-wave mixing (FWM) and Raman scattering on the quantum channels were analyzed.Next,an unequal-frequency-spacing-based FWM noise suppression algorithm and a wavelength assignment algorithm for joint suppression of FWM and Raman scattering were proposed for different application scenarios with different channel space and transmission distance.Finally,the superiorities of the proposed algorithms were verified through numerical simulations.The research results provide feasible noise suppression schemes for different application scenarios in the future.

Key words: quantum key distribution, co-propagation, four-wave mixing, Raman scattering, noise suppression, wavelength assignment

孙咏梅,牛佳宁,纪越峰. 量子信号与经典光信号共纤传输中的噪声抑制技术[J]. 电信科学, 2018, 34(9): 37-47.

Yongmei SUN,Jianing NIU,Yuefeng JI. Noise suppression in the co-propagation of quantum signals and classical optical signals[J]. Telecommunications Science, 2018, 34(9): 37-47.

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参数	数值
SPD门宽（τ_gate）	125 ps
SPD 探测效率（η_spd ）	10%
重复频率（f_s）	10 MHz
量子信道滤波器带宽（Δλ）	0.12 nm
系统插入损耗（IL）	8 dB
经典光信号功率（P）	0 dBm

		经典光信道间隔为100 GHz	经典光信道间隔为200 GHz
EFS	经典光信道	193.2 THz,193.3 THz,193.4 THz	192.9 THz,193.1 THz,193.3 THz
	量子信道	193.5 THz,193.6 THz,193.7 THz	193.5 THz,193.7 THz,193.9 THz
UFS	经典光信道	193.2 THz,193.275 THz,193.375 THz	192.9 THz,193.05 THz,193.25 THz
	量子信道	193.5 THz,193.65 THz,193.7 THz	193.5 THz,193.8 THz,193.9 THz
JOCA	经典光信道	193.2 THz,193.3 THz,193.4 THz	192.9 THz,193.1 THz,193.3 THz
	量子信道	193.25 THz,193.35 THz,193.45 THz	193 THz,193.2 THz,193.4 THz