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Thermal and high speed modulation characteristics for AlGaInAs/InP microdisk lasers.

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    This study analyzes a microdisk laser

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    Area of Science:

    • Optoelectronics
    • Semiconductor Lasers

    Background:

    • Microdisk lasers offer compact and efficient light sources.
    • Understanding thermal and modulation characteristics is crucial for high-speed applications.

    Purpose of the Study:

    • To investigate the thermal properties and high-speed modulation performance of a unidirectional-emission microdisk laser.
    • To correlate temperature rise with pulsed current operation and assess modulation bandwidth.

    Main Methods:

    • Experimental measurement of lasing spectra under varying pulsed current widths.
    • Finite-element modeling (FEM) for thermal distribution simulation.
    • Small-signal modulation response and eye-diagram measurements.

    Main Results:

    • A threshold current of 1.5 mA at 287 K was achieved.
    • A temperature rise of 25 K was estimated at 20 mA bias.
    • A 3dB bandwidth of 20 GHz was obtained at 18 mA bias.

    Conclusions:

    • The microdisk laser demonstrates promising high-speed modulation capabilities.
    • Thermal management is a key factor for optimizing performance at higher bias currents.
    • The device is suitable for optical communication systems operating at tens of GHz.