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

Abstract

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

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.

Figures/Tables 9

References 31

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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

Noise suppression in the co-propagation of quantum signals and classical optical signals

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