Physical-layer key distribution using synchronous complex dynamics of DBR semiconductor lasers Article Swipe
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· 2024
· Open Access
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· DOI: https://doi.org/10.1063/5.0187742
Common-signal-induced synchronization of semiconductor lasers with optical feedback inspired a promising physical-layer 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 the key rate without sacrificing the operation parameter space for security. Here, open-loop synchronization of wavelength-tunable multi-section distributed Bragg reflector 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 open a new avenue for a high-rate physical-layer key distribution using laser synchronization.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1063/5.0187742
- https://pubs.aip.org/aip/app/article-pdf/doi/10.1063/5.0187742/19724380/036109_1_5.0187742.pdf
- OA Status
- gold
- Cited By
- 12
- References
- 30
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4392643735