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GeSi modulator based on two-mode interference.

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    Summary
    This summary is machine-generated.

    This study presents a Germanium-Silicon (GeSi) modulator utilizing two-mode interference. Optimized doping and layer height achieve efficient on/off switching for high-speed optical communication.

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    Area of Science:

    • Photonics
    • Semiconductor Devices
    • Optical Modulators

    Background:

    • Two-mode interference modulators offer potential for high-speed optical signal processing.
    • Germanium-Silicon (GeSi) is a promising material for integrated photonics due to its compatibility with silicon fabrication.
    • Controlling optical power overlap and utilizing free carrier effects are crucial for modulator performance.

    Purpose of the Study:

    • To design and analyze a novel GeSi modulator based on two-mode interference.
    • To investigate the impact of GeSi layer height on optical mode overlap.
    • To explore the use of free carrier plasma dispersion for efficient switching.

    Main Methods:

    • Design of a GeSi modulator incorporating a 0.22 μm GeSi layer.
    • Implementation of a doping region with a concentration of 1×10¹⁸ cm⁻³ (n-type and p-type).
    • Analysis of device performance including extinction ratio, insertion loss, and bandwidth using traveling electrode design.

    Main Results:

    • A GeSi layer height of 0.22 μm effectively reduced optical power overlap.
    • Free carrier plasma dispersion enabled on- and off-state switching by altering the oscillation period.
    • The modulator achieved an extinction ratio of 15 dB and an insertion loss of 5 dB.
    • A 3 dB bandwidth of 50 GHz was demonstrated with a traveling electrode design and 3 V operation.

    Conclusions:

    • The designed GeSi modulator effectively utilizes two-mode interference for optical modulation.
    • The study demonstrates the feasibility of using GeSi and free carrier effects for high-performance modulators.
    • The achieved bandwidth and performance metrics indicate suitability for high-speed optical communication systems.