Coexistence of 1 Tbps classical optical communication and quantum key distribution over a 100.96 km few-mode fiber

Tianqi Dou; Song Gao; Chengliang Zhang; Jiangang Tong; Rende Liu; Lei Shen; Lei Shen; Juhao Li; Juhao Li; Zhengjun Pan; Min Liao; Jianjun Tang; Jianjun Tang; Shibiao Tang; Shibiao Tang

doi:10.1364/OL.500406

Optics Letters
Vol. 48,
Issue 18,
pp. 4905-4908
(2023)
•https://doi.org/10.1364/OL.500406

Coexistence of 1 Tbps classical optical communication and quantum key distribution over a 100.96 km few-mode fiber

Tianqi Dou, Song Gao, Chengliang Zhang, Jiangang Tong, Rende Liu, Lei Shen, Juhao Li, Zhengjun Pan, Min Liao, Jianjun Tang, and Shibiao Tang

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Tianqi Dou, Song Gao, Chengliang Zhang, Jiangang Tong, Rende Liu, Lei Shen, Juhao Li, Zhengjun Pan, Min Liao, Jianjun Tang, and Shibiao Tang, "Coexistence of 1 Tbps classical optical communication and quantum key distribution over a 100.96 km few-mode fiber," Opt. Lett. 48, 4905-4908 (2023)

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Abstract

The integration of quantum key distribution (QKD) and classical optical communication has attracted widespread attention. In this Letter, we experimentally demonstrate a real-time co-propagation of 1 Tbps for 10 classical channels with one discrete-variable QKD channel in the weakly coupled few-mode fiber (FMF). Based on the selection of optimal device parameters and wavelength assignment of classical channels, as well as the optimization of equipment performance, a secure key rate of as high as 2.7 kbps of coexistence transmission of QKD and classical optical communication can be achieved using a 100.96 km weakly coupled FMF. Therefore, this study is a step toward realizing long-distance quantum–classical coexistence transmission.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Reference	WDM Type	Transmission Distance (km)	Launch Power of Classical Channels (dBm)	Throughput	Fiber Type	SKR
Ref. [29]	CWDM	75	21	1.36 Tbps	SMF	254 bps
Ref. [25]	DWDM	10	25	–	7-core MCF	16 kbps
Ref. [26]	DWDM	86	$- 2.6$	100 Gbps	FMF	1.3 kbps
This work	DWDM	100.96	$- 5.5$	1 Tbps	FMF	2.7 kbps

Mode	Attenuation Coefficient	Effective Core Area	Insertion Loss
Mode	Attenuation Coefficient	Effective Core Area	MMUX	MDEMUX
${L P}_{01}$	$0.226 d B / k m$	$138 μ m^{2}$	$1.2 d B$	$1.5 d B$
${L P}_{02}$	$0.236 d B / k m$	$132 μ m^{2}$	$1.7 d B$	$1.4 d B$

Reference	WDM Type	Transmission Distance (km)	Launch Power of Classical Channels (dBm)	Throughput	Fiber Type	SKR
Ref. [29]	CWDM	75	21	1.36 Tbps	SMF	254 bps
Ref. [25]	DWDM	10	25	–	7-core MCF	16 kbps
Ref. [26]	DWDM	86	$- 2.6$	100 Gbps	FMF	1.3 kbps
This work	DWDM	100.96	$- 5.5$	1 Tbps	FMF	2.7 kbps

Mode	Attenuation Coefficient	Effective Core Area	Insertion Loss
Mode	Attenuation Coefficient	Effective Core Area	MMUX	MDEMUX
${L P}_{01}$	$0.226 d B / k m$	$138 μ m^{2}$	$1.2 d B$	$1.5 d B$
${L P}_{02}$	$0.236 d B / k m$	$132 μ m^{2}$	$1.7 d B$	$1.4 d B$

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