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Mode-coupling effects in an optically-injected dual-wavelength laser.

Shahab Abdollahi, Pablo Marin-Palomo, Martin Virte

    Optics Express
    |October 15, 2022
    PubMed
    Summary

    Researchers explored multi-wavelength lasers for microwave photonics. Optical injection into a suppressed mode caused a dominant mode wavelength shift, influenced by mode suppression ratio and cross-coupling.

    Area of Science:

    • Photonics and Optical Engineering
    • Nonlinear Dynamics
    • Microwave Photonics

    Background:

    • Multi-wavelength lasers are crucial for advanced microwave photonic technologies.
    • Understanding nonlinear mode coupling and dynamics in these lasers under optical injection is essential but underexplored.

    Purpose of the Study:

    • To experimentally and numerically investigate the effects of optical injection on a dual-wavelength laser.
    • To analyze the interactions between dominant and suppressed modes under specific injection conditions.

    Main Methods:

    • Experimental setup utilizing a dual-wavelength laser system.
    • Numerical simulations to model laser dynamics and mode interactions.
    • Optical injection applied around the suppressed mode frequency.

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    Main Results:

    • Observed a wavelength shift in the dominant mode due to injection locking of the suppressed mode.
    • Demonstrated a significant dependence of the locking range on the mode suppression ratio.
    • Numerically identified the cross-coupling parameter as potentially key to the observed effects.

    Conclusions:

    • Optical injection into the suppressed mode of a dual-wavelength laser can induce significant changes in the dominant mode.
    • Mode suppression ratio and inter-modal cross-coupling are critical parameters influencing laser dynamics under optical injection.