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    This study introduces a secure trilateral communication system using three coupled chaotic semiconductor lasers. The method enables simultaneous message transmission and reception between all three lasers, ensuring data security.

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    Area of Science:

    • Optics and Photonics
    • Nonlinear Dynamics
    • Secure Communications

    Background:

    • Chaotic semiconductor lasers exhibit complex dynamics suitable for secure communication.
    • Coupling lasers can synchronize their chaotic behavior, enabling information transfer.
    • Existing methods often lack robust trilateral communication capabilities.

    Purpose of the Study:

    • To propose and demonstrate a novel chaos-based scheme for trilateral communication.
    • To enable simultaneous transmission and reception of three distinct messages among three lasers.
    • To ensure the security of the communication against eavesdropping.

    Main Methods:

    • Utilizing three mutually coupled chaotic semiconductor lasers.
    • Inducing chaotic dynamics via optical coupling through a partially transparent mirror.
    • Numerically solving the delay rate equations to analyze laser dynamics.
    • Encoding messages by modulating the bias current of each laser.

    Main Results:

    • Demonstrated complete synchronization of the chaotic dynamics among the three lasers.
    • Successfully transmitted and restored three different messages simultaneously.
    • Confirmed that each laser acts as both a transmitter and a receiver.
    • Showcased secure communication by making messages unintelligible to eavesdroppers monitoring synchronization error.

    Conclusions:

    • The proposed scheme effectively realizes simultaneous trilateral communication using coupled chaotic lasers.
    • The system offers inherent security, preventing eavesdroppers from deciphering transmitted messages.
    • This work advances secure optical communication by leveraging chaotic dynamics in a multi-user setting.