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Segmented waveguide photodetector with 90% quantum efficiency.

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    We developed a new photodetector using InGaAsP/InP segmented waveguides and directional couplers. This device achieves 90% quantum efficiency at 1550 nm with a 15 GHz bandwidth, using minimal absorber volume.

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    Area of Science:

    • Optoelectronics
    • Semiconductor devices
    • Photonics

    Background:

    • Photodetectors are crucial components in optical communication systems.
    • Miniaturization and high performance are key challenges in photodetector design.
    • Waveguide photodetectors offer advantages in integration and speed.

    Purpose of the Study:

    • To demonstrate a novel InGaAsP/InP segmented waveguide photodetector.
    • To achieve high internal quantum efficiency (QE) and bandwidth with a small active volume.
    • To explore the use of directional couplers for enhanced photodetector performance.

    Main Methods:

    • Design of a segmented waveguide photodetector using InGaAsP/InP material system.
    • Utilizing directional couplers to match propagation constants of even and odd modes.
    • Fabrication of a 6-element photodetector with a small absorber volume (19 μm³ per element).

    Main Results:

    • Achieved an internal quantum efficiency (QE) of 90% at 1550 nm wavelength.
    • Demonstrated a bandwidth of 15 GHz.
    • Obtained a responsivity of 1.13 A/W.

    Conclusions:

    • The novel InGaAsP/InP segmented waveguide photodetector demonstrates high performance.
    • The design based on directional couplers enables efficient light absorption in a compact structure.
    • This technology holds promise for advanced optical communication and sensing applications.