Physical-layer key distribution using synchronous complex dynamics of DBR semiconductor lasers

• URL: http://arxiv.org/abs/2310.20365v1
• Date: Tue, 31 Oct 2023 11:22:35 GMT
• Title: Physical-layer key distribution using synchronous complex dynamics of DBR semiconductor lasers
• Authors: Anbang Wang, Yicheng Du, Qingtian Li, Longsheng Wang, Zhiwei Jia, Yuwen Qin, Yuncai Wang,
• Abstract summary: wavelength-tunable multi-section distributed Bragg reflector (DBR) lasers are proposed as a solution for physical-layer key distribution. Experiments show that the synchronization is sensitive to two operation parameters, i.e., currents of grating section and phase section. Fast wavelength-shift keying synchronization can be achieved by direct modulation on one of the two currents.
• Score: 5.088060609198617
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Common-signal-induced synchronization of semiconductor lasers with optical feedback inspired a promising physical key distribution with information-theoretic security and potential in high rate. A significant challenge is the requirement to shorten the synchronization recovery time for increasing key rate without sacrificing operation parameter space for security. Here, open-loop synchronization of wavelength-tunable multi-section distributed Bragg reflector (DBR) lasers is proposed as a solution for physical-layer key distribution. Experiments show that the synchronization is sensitive to two operation parameters, i.e., currents of grating section and phase section. Furthermore, fast wavelength-shift keying synchronization can be achieved by direct modulation on one of the two currents. The synchronization recovery time is shortened by one order of magnitude compared to close-loop synchronization. An experimental implementation is demonstrated with a final key rate of 5.98 Mbit/s over 160 km optical fiber distance. It is thus believed that fast-tunable multi-section semiconductor lasers opens a new avenue of high-rate physical-layer key distribution using laser synchronization.

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