Journal
IEEE JOURNAL OF QUANTUM ELECTRONICS
Volume 56, Issue 1, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JQE.2019.2950943
Keywords
Chaos synchronization; dispersive feedback; random bit generation; semiconductor laser
Categories
Funding
- National Science Foundation of China [61805170, 61822509, 61731014, 61671316, 61805171, 61705160]
- National Cryptography Foundation [MMJJ20170207]
- International Cooperation Program
- Natural Science Foundation of Shanxi Province [201603D421008, 61961136002, 201801D221189, 201701D1211362, 201802044]
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We experimentally demonstrate high-speed correlated random bit generation in real time using synchronized chaotic lasers commonly driven by a laser with dispersive feedback. The dispersive feedback from a chirped fiber Bragg grating induces frequency-dependent feedback delay and thus no longer causes time-delay signature, and resultantly ensures the signal randomness and security of chaotic laser. Driven by the time-delay signature-free chaotic signal, the two response lasers are routed into chaotic states and establish a synchronization with correlation beyond 0.97 while they maintain a low correlation level with the drive signal. Through quantizing the synchronized laser chaos with a one-bit differential comparator, real-time 2.5-Gb/s correlated random bits with verified randomness are experimentally obtained with a bit error ratio of 0.07. Combining with a robust sampling method, the BER could be further decreased to corresponding to an effective generation rate of 1.7 Gb/s. Bit error analysis indicates that the bit error ratio between the responses is lower than that between the drive and responses over a wide parameter region due to the synchronization superiority of the responses over the drive.
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