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Wideband chaos synchronization using discrete-mode semiconductor lasers.

Longsheng Wang, Huiyu Huang, Xiaoxin Mao

    Optics Letters
    |June 30, 2023
    PubMed
    Summary

    Researchers achieved wideband chaos synchronization using discrete-mode semiconductor lasers (DMLs). This breakthrough enables high-speed optical chaos communication by overcoming synchronization challenges.

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    Area of Science:

    • Optics and Photonics
    • Telecommunications Engineering
    • Nonlinear Dynamics

    Background:

    • High-speed optical chaos communication is hindered by the difficulty of achieving wideband chaos synchronization.
    • Discrete-mode semiconductor lasers (DMLs) are crucial components in modern optical systems.

    Purpose of the Study:

    • To experimentally demonstrate wideband chaos synchronization using DMLs.
    • To identify the parameter range and conditions for achieving robust wideband chaos synchronization.

    Main Methods:

    • Utilized a master-slave open-loop configuration with DMLs.
    • Generated wideband chaos (30 GHz 10-dB bandwidth) in a master DML via external mirror feedback.
    • Achieved injection-locking chaos synchronization by injecting chaos into a slave DML.

    Main Results:

    • Demonstrated wideband chaos synchronization with a synchronization coefficient of 0.888.
    • Identified a wide parameter range for synchronization, including frequency detuning from -18.75 GHz to 1.25 GHz under strong injection.
    • Found that slave DMLs with lower bias current and smaller relaxation oscillation frequency are more susceptible to wideband synchronization.

    Conclusions:

    • Wideband chaos synchronization is experimentally achievable using DMLs in a master-slave configuration.
    • The findings provide a pathway for high-speed optical chaos communication systems.
    • Optimizing slave DML parameters enhances the susceptibility to wideband synchronization.