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Related Experiment Videos

Vertically integrated spot-size converter in AlGaAs-GaAs.

Zhongfa Liao, S J Wagner, M Z Alam

    Optics Letters
    |October 14, 2017
    PubMed
    Summary

    We demonstrated a spot size converter (SSC) for photonic integration. This device efficiently couples light between different waveguide layers on a GaAs substrate at 850 nm.

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    Area of Science:

    • Photonics and Optical Engineering
    • Semiconductor Materials Science

    Background:

    • Monolithic photonic integration requires efficient coupling between different waveguide types.
    • Existing methods for fiber-to-chip coupling can be complex and lossy.
    • GaAs-based photonics are crucial for high-speed optical communication.

    Purpose of the Study:

    • To demonstrate a novel spot size converter (SSC) for monolithic photonic integration.
    • To achieve efficient light coupling between a high refractive index contrast waveguide and a single-mode fiber.
    • To validate the performance of the SSC at a wavelength of 850 nm on a GaAs substrate.

    Main Methods:

    • Design and fabrication of a dual-waveguide AlGaAs chip.
    • Incorporation of a vertical spot size converter (SSC) to bridge two waveguide layers.
    • Characterization of the SSC conversion efficiency for the TE mode at 850 nm.

    Main Results:

    • A dual-waveguide structure was successfully fabricated on a GaAs substrate.
    • The spot size converter (SSC) achieved a conversion efficiency of 91% (-0.4 dB).
    • Efficient coupling was demonstrated between upper and lower waveguide layers at 850 nm for the TE mode.

    Conclusions:

    • The demonstrated spot size converter (SSC) enables efficient monolithic photonic integration.
    • The GaAs-based AlGaAs chip design facilitates effective fiber-to-chip coupling.
    • This technology is promising for advancing high-performance optical communication systems.

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