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Related Experiment Video

Updated: Feb 17, 2026

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Real-time physical random bit generation at Gbps based on random fiber lasers.

Yanping Xu, Ping Lu, Stephen Mihailov

    Optics Letters
    |December 8, 2017
    PubMed
    Summary

    This study introduces a high-speed physical random bit generator utilizing chaotic fluctuations from a novel fiber laser. It achieves gigabits per second random number generation in real-time, enhancing security for various applications.

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    Area of Science:

    • Physics
    • Optical Engineering
    • Information Security

    Background:

    • Traditional random bit generators often suffer from speed limitations or require complex post-processing.
    • Physical random number generators (PRNGs) leverage inherent randomness in physical processes for enhanced security.
    • Chaotic dynamics in lasers offer a promising avenue for high-speed PRNGs.

    Purpose of the Study:

    • To demonstrate a high-speed physical random bit generator.
    • To achieve gigabit-per-second random bit generation without time-delay signatures.
    • To utilize chaotic power fluctuations from a novel fiber laser for real-time random number generation.

    Main Methods:

    • Configuration of a ring-structure fiber laser with semiconductor optical amplifiers and a fiber random grating.

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  • Exploitation of random distributed feedback from the fiber random grating to induce chaotic lasing output.
  • Operation of the laser slightly above the lasing threshold to intensify chaotic dynamics.

    • Main Results:

    • Demonstration of a physical random bit generator operating at approximately 1.6 Gbps.
    • Generation of random bits without the time-delay signature, verified through standard randomness tests.
    • Real-time operation capability, eliminating the need for offline post-processing.

    Conclusions:

    • The developed fiber laser-based random bit generator offers a high-speed, secure solution.
    • The system provides high-quality randomness suitable for demanding applications.
    • This work advances the field of physical random number generation with real-time, high-bit-rate capabilities.