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    This study introduces a novel architecture for chaotic optical communications, enhancing security by concealing time delays and expanding the key space to 10^48. This breakthrough paves the way for high-speed, secure communication systems.

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    Area of Science:

    • Optics and Photonics
    • Information Security
    • Telecommunications

    Background:

    • Practical chaotic optical communication is hindered by challenges in concealing time delays and expanding key space.
    • Time delay is a critical security parameter in feedback chaotic systems.
    • Current methods for enlarging key space often increase implementation complexity.

    Purpose of the Study:

    • To propose a novel architecture for chaotic optical communication systems.
    • To address the limitations of time delay concealment and key space expansion.
    • To enable high-speed and secure optical communication.

    Main Methods:

    • Introduction of a frequency-dependent group delay module with 1 MHz tuning resolution into the chaotic feedback loop.
    • Utilizing numerical simulations to validate the proposed scheme.
    • Conducting experimental verification of the architecture's effectiveness.

    Main Results:

    • Demonstrated excellent time delay concealment effect.
    • Achieved a significant expansion of the key space by an additional 10^48.
    • Confirmed the effectiveness through both numerical simulation and experimental validation.

    Conclusions:

    • The proposed architecture effectively overcomes limitations in chaotic optical communication.
    • The scheme offers a substantial increase in security through enhanced time delay concealment and a vastly enlarged key space.
    • Compatibility with existing commercial systems facilitates the adoption for high-speed secure optical communications.