Physical-layer key distribution using synchronous complex dynamics of DBR semiconductor lasers
| Autor: | Wang, Anbang, Du, Yicheng, Li, Qingtian, Wang, Longsheng, Jia, Zhiwei, Qin, Yuwen, Wang, Yuncai |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | APL Photonics 9, 036109 (2024) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/5.0187742 |
| Popis: | 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. Comment: 13 pages, 5 figures |
| Databáze: | arXiv |
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