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O-band membrane photodetector with InGaAsP-bulk absorption core using Franz-Keldysh effect.

Takuma Aihara, Tatsurou Hiraki, Yoshiho Maeda

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    |January 29, 2025
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    Summary

    We developed a novel O-band membrane photodetector (PD) for silicon photonics, achieving over 67 GHz bandwidth and 0.6 A/W responsivity for high-speed optical transceivers.

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    Area of Science:

    • Photonics and Optoelectronics
    • Materials Science and Engineering
    • Integrated Optics

    Background:

    • Increasing demand for compact, low-power optical transceivers for short-reach fiber links.
    • Waveguide-integrated photodetectors (PDs) are crucial for Si photonics platforms.
    • Existing PD designs face limitations in operating speed due to photocarrier diffusion.

    Purpose of the Study:

    • To fabricate an O-band membrane PD suitable for integration with Si photonics.
    • To enhance PD operating speed and responsivity by utilizing the Franz-Keldysh effect (FKE).
    • To demonstrate a high-performance PD for 100-Gbit/s optical communication.

    Main Methods:

    • Fabrication of an InGaAsP-bulk absorption core membrane PD with a lateral p-i-n junction on a Si photonics platform.
    • Designing the absorption core's bandgap wavelength to be shorter than the operating wavelength to leverage FKE.
    • Heterogeneous integration of the PD with a SiOx waveguide.

    Main Results:

    • Verified that FKE increases photocurrent by enhancing absorption in the undoped core.
    • Observed increased optoelectronic (OE) bandwidth due to wavelength detuning.
    • Achieved a fiber-to-PD responsivity of 0.6 A/W and a bandwidth exceeding 67 GHz.
    • Demonstrated clear eye openings for 100-Gbit/s non-return-to-zero (NRZ) signals at 25°C.

    Conclusions:

    • The developed membrane PD effectively overcomes speed limitations using FKE and wavelength detuning.
    • The device is well-suited for integration into Si photonics platforms for advanced optical transceivers.
    • The high performance demonstrates potential for future high-speed short-reach optical communication systems.