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Instability of optical phase synchronization between chaotic semiconductor lasers.

Xiaoxin Mao, Yuchuan Sun, Longsheng Wang

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    |June 15, 2021
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    Summary

    Optical phase chaos synchronization between semiconductor lasers is unstable. The phase difference randomly jumps, caused by external cavity mode instability in the master laser, hindering reliable synchronization.

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    Area of Science:

    • Optoelectronics
    • Nonlinear Dynamics
    • Laser Physics

    Background:

    • Optical phase chaos synchronization is crucial for secure communication and signal processing.
    • Master-slave configurations are commonly used to achieve synchronization.
    • Instability in synchronization can limit practical applications.

    Purpose of the Study:

    • To investigate the instability of optical phase chaos synchronization in a master-slave semiconductor laser system.
    • To analyze the behavior of the phase difference between master and slave lasers.
    • To identify the underlying cause of synchronization instability.

    Main Methods:

    • Experimental investigation using heterodyne detection and Hilbert transform to measure phase difference.
    • Numerical simulation by solving semiconductor laser rate equations.
    • Statistical analysis of phase difference duration and jumping values.

    Main Results:

    • The phase difference between master and slave lasers was observed to be unstable, maintaining a value for short durations before randomly jumping.
    • Statistical analysis confirmed the random nature of both the duration of phase stability and the magnitude of phase jumps.
    • Theoretical analysis identified instability in the master laser's external cavity mode as the cause of phase synchronization instability.

    Conclusions:

    • Optical phase chaos synchronization in the studied master-slave semiconductor laser system is inherently unstable.
    • The instability is attributed to random fluctuations in the master laser's external cavity mode.
    • Understanding this instability is critical for developing robust chaos synchronization schemes.