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Direct modulation of electrically pumped coupled microring lasers.

Chi Xu, William E Hayenga, Demetrios N Christodoulides

    Optics Express
    |February 25, 2022
    PubMed
    Summary

    Gain-loss contrast in coupled microring lasers enhances modulation frequency response. Adjusting injection currents improved bandwidth by over 1.6 times the fundamental resonant frequency.

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    Area of Science:

    • Optoelectronics
    • Semiconductor Lasers
    • Photonics

    Background:

    • Laser diodes are crucial for optical communication.
    • Enhancing modulation frequency response is key for higher data rates.
    • Coupled resonator systems offer tunable optical properties.

    Purpose of the Study:

    • To investigate gain-loss contrast as a method for improving laser diode modulation frequency response.
    • To demonstrate bandwidth enhancement in coupled microring laser diodes.
    • To validate experimental findings with a rate equation model.

    Main Methods:

    • Fabrication of an electrically pumped microring laser system on an InAlGaAs/InP MQW p-i-n structure.
    • Experimental adjustment of injection current ratios in two coupled microrings.
    • Utilizing a rate equation simulation model for theoretical validation.

    Main Results:

    • Achieved a room temperature continuous wave (CW) laser threshold current of 27 mA.
    • Demonstrated a bandwidth improvement of up to 1.63 times the fundamental resonant frequency.
    • Experimental results showed good agreement with the simulation model.

    Conclusions:

    • Gain-loss contrast in coupled resonators is a viable strategy for enhancing laser diode modulation bandwidth.
    • The demonstrated technique offers a new degree of freedom for optimizing laser performance.
    • This approach has potential for advancing high-speed optical communication technologies.