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Ultrafast evanescently coupled waveguide MUTC-PDs with high responsivity.

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    Novel waveguide photodiodes (MUTC-PDs) achieve high optical-to-electrical conversion efficiency. This design enhances light absorption and reduces coupling loss for ultrawide bandwidth performance.

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    Area of Science:

    • Photonics and Optoelectronics
    • Semiconductor Devices

    Background:

    • Uni-traveling carrier photodiodes (UTC-PDs) are crucial for high-speed optical communication.
    • Improving optical-to-electrical (O/E) conversion efficiency and bandwidth remains a key challenge.

    Purpose of the Study:

    • To develop novel evanescently coupled waveguide modified uni-traveling carrier photodiodes (MUTC-PDs).
    • To enhance O/E conversion efficiency and achieve ultrawide bandwidth performance.

    Main Methods:

    • Utilized a thick multi-layer coupling waveguide with a gradually increased refractive index.
    • Engineered the waveguide to facilitate upward light transmission into the absorption region.
    • Integrated the top layer of the coupling waveguide as the drift layer.

    Main Results:

    • Achieved high responsivity of 0.38 A/W without additional optical components.
    • Demonstrated an ultrawide 3-dB bandwidth of 153 GHz.
    • Successfully enhanced evanescent coupling efficiency and reduced input coupling loss.

    Conclusions:

    • The novel MUTC-PD design effectively improves O/E conversion efficiency and bandwidth.
    • The integrated multi-layer coupling waveguide is key to achieving simultaneous high performance.
    • This technology offers a promising solution for next-generation high-speed optical systems.