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    Researchers demonstrated a tri-mode laser generating broadband chaos. Adjusting parameters significantly enhanced the chaotic bandwidth, achieving a 35.3 GHz effective bandwidth with an 8.3 dB flatness.

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    Area of Science:

    • Photonics and Laser Technology
    • Nonlinear Dynamics
    • Microwave Photonics

    Background:

    • Chaos generation in lasers is crucial for secure communications and signal processing.
    • Micro-lasers offer miniaturization advantages for integrated photonic systems.
    • Optical feedback is a common method to induce nonlinear dynamics in lasers.

    Purpose of the Study:

    • To propose and demonstrate a tri-mode micro-square laser for broadband chaos generation.
    • To investigate the influence of lasing mode intensities, frequency intervals, and optical feedback strength on chaotic bandwidth.
    • To achieve a flat broadband microwave spectrum from the chaotic laser output.

    Main Methods:

    • Utilized a micro-square laser configuration.
    • Implemented an optical feedback loop.
    • Adjusted parameters such as lasing mode intensities, frequency intervals, and feedback strength.
    • Analyzed the chaotic output spectrum to determine bandwidth and flatness.

    Main Results:

    • Successfully generated chaos with a broadband flat microwave spectrum.
    • Demonstrated significant enhancement of chaotic bandwidth by adjusting system parameters.
    • Observed two mode-beating peaks contributing to a larger flat bandwidth.
    • Experimentally achieved an effective bandwidth of 35.3 GHz with a flatness of 8.3 dB.

    Conclusions:

    • The tri-mode micro-square laser under optical feedback is an effective platform for generating broadband flat microwave chaos.
    • Parameter control allows for significant enhancement of chaotic bandwidth and spectral flatness.
    • This work provides a promising approach for high-speed chaos generation in compact laser systems.