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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Random bit generation at tunable rates using a chaotic semiconductor laser under distributed feedback.

Xiao-Zhou Li, Song-Sui Li, Jun-Ping Zhuang

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    This study introduces a novel random bit generation method using a fiber Bragg grating (FBG) semiconductor laser. The FBG laser achieves high-speed, tunable random bit generation with proven randomness, enhancing cybersecurity applications.

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    Area of Science:

    • Optoelectronics
    • Information Security
    • Nonlinear Dynamics

    Background:

    • Semiconductor lasers are crucial for secure communication.
    • Traditional random bit generation methods face limitations in speed and randomness.
    • Fiber Bragg gratings (FBGs) offer unique distributed feedback mechanisms.

    Purpose of the Study:

    • To investigate a semiconductor laser with FBG feedback for enhanced random bit generation (RBG).
    • To explore the impact of distributed feedback on laser chaos and randomness.
    • To achieve high-speed and tunable random bit generation.

    Main Methods:

    • Utilizing a semiconductor laser perturbed by FBG-induced distributed feedback.
    • Implementing periodic sampling of laser intensity for chaotic emission.
    • Applying postprocessing techniques (self-differencing, bit selection) for random bit conversion.

    Main Results:

    • FBG feedback suppresses feedback delay information, ensuring randomness.
    • Achieved continuous tuning of output bit rates from 0.3 to 100 Gbps.
    • Demonstrated randomness using the National Institute of Standards and Technology (NIST) test suite.

    Conclusions:

    • FBG feedback is effective for high-performance RBG.
    • The proposed method offers tunable bit rates and robust randomness.
    • This technology has significant potential for secure communication systems.