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Updated: Aug 25, 2025

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Fast physical random bit generation based on a chaotic optical injection system with multi-path optical feedback.

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    Summary
    This summary is machine-generated.

    Researchers generated a 640 Gb/s random bit sequence using a chaotic semiconductor laser system and circulating exclusive-or (CXOR) post-processing. The generated sequence passed all National Institute of Standards and Technology (NIST) statistical tests for randomness.

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    Area of Science:

    • Optoelectronics
    • Information Security
    • Chaos Theory

    Background:

    • High-speed random bit sequence generation is crucial for secure communications.
    • Chaotic systems offer a promising approach due to their inherent unpredictability.
    • Semiconductor lasers are suitable for creating compact and efficient chaotic signal generators.

    Purpose of the Study:

    • To generate a high-speed (640 Gb/s) random bit sequence.
    • To optimize a chaotic semiconductor laser system for high-quality chaotic signal generation.
    • To validate the randomness of the generated bit sequence using NIST statistical tests.

    Main Methods:

    • A chaotic system was built using a master-slave semiconductor laser configuration with multi-path optical feedback.
    • Chaotic signal quality was optimized by analyzing time-delay-signature (TDS) and bandwidth against operational parameters.
    • A circulating exclusive-or (CXOR) method was applied to an 8-bit digital signal sampled at 80 GSa/s to produce the final bit sequence.

    Main Results:

    • Optimized parameters yielded a chaotic signal with large bandwidth and low TDS.
    • A 640 Gb/s random bit sequence was successfully generated.
    • The generated sequence passed all NIST Special Publication 800-22 statistical tests, confirming its high randomness.

    Conclusions:

    • The optimized chaotic semiconductor laser system effectively generates high-quality chaotic signals.
    • The CXOR post-processing method is suitable for producing high-speed random bit sequences from chaotic signals.
    • The generated 640 Gb/s random bit sequence meets rigorous statistical standards for cryptographic applications.