
1.Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, Taiyuan, China
2.College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan, China
3.School of Information Engineering, Guangdong University of Technology, Guangzhou, China
4.Guangdong Provincial Key Laboratory of Photonics Information Technology, Guangzhou, China
5.Center for Information Photonics and Communications, School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
Anbang Wang(wanganbang@tyut.edu.cn)
Published:30 September 2021,
Published Online:30 August 2021,
Received:09 February 2021,
Revised:04 August 2021,
Accepted:08 August 2021
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Hua G. et al. 0.75 Gbit/s high-speed classical key distribution with mode-shift keying chaos synchronization of Fabry–Perot lasers. Light: Science & Applications, 10, 1780-1788 (2021).
Hua G. et al. 0.75 Gbit/s high-speed classical key distribution with mode-shift keying chaos synchronization of Fabry–Perot lasers. Light: Science & Applications, 10, 1780-1788 (2021). DOI: 10.1038/s41377-021-00610-w.
High-speed physical key distribution is diligently pursued for secure communication. In this paper
we propose and experimentally demonstrate a scheme of high-speed key distribution using mode-shift keying chaos synchronization between two multi-longitudinal-mode Fabry–Perot lasers commonly driven by a super-luminescent diode. Legitimate users dynamically select one of the longitudinal modes according to private control codes to achieve mode-shift keying chaos synchronization. The two remote chaotic light waveforms are quantized to generate two raw random bit streams
and then those bits corresponding to chaos synchronization are sifted as shared keys by comparing the control codes. In this method
the transition time
i.e.
the chaos synchronization recovery time is determined by the rising time of the control codes rather than the laser transition response time
so the key distribution rate is improved greatly. Our experiment achieved a 0.75-Gbit/s key distribution rate with a bit error rate of 3.8 × 10
−3
over 160-km fiber transmission with dispersion compensation. The entropy rate of the laser chaos is evaluated as 16 Gbit/s
which determines the ultimate final key rate together with the key generation ratio. It is therefore believed that the method pays a way for Gbit/s physical key distribution.
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