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Updated: May 1, 2026

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
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Tilted MMI crossings based on silicon wire waveguide.

Sang-Hun Kim, Guangwei Cong, Hitoshi Kawashima

    Optics Express
    |March 26, 2014
    PubMed
    Summary
    This summary is machine-generated.

    Silicon wire waveguide crossings using tilted multi-mode interference (MMI) structures achieve low crosstalk below -38 dB. A novel polarization-insensitive design further reduces crosstalk to below -30 dB in the C-band.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Semiconductor Devices

    Background:

    • Waveguide crossings are essential components in integrated photonic circuits.
    • Minimizing crosstalk is critical for signal integrity in dense optical networks.
    • Silicon wire waveguides offer high confinement and compatibility with semiconductor fabrication.

    Purpose of the Study:

    • To propose and demonstrate waveguide crossings using tilted multi-mode interference (MMI) structures.
    • To optimize the MMI waveguide intersection angle for reduced crosstalk.
    • To develop a novel polarization-insensitive waveguide crossing design.

    Main Methods:

    • Design and simulation of tilted MMI structures for silicon wire waveguides.
    • Optimization of the intersecting angle for minimal crosstalk under specified input polarizations.
    • Fabrication and experimental characterization of MMI waveguide crossings.
    • Development and testing of a polarization-insensitive crossing using a diversity circuit.

    Main Results:

    • Achieved experimental crosstalk lower than -38 dB in the C-band for tilted MMI crossings.
    • Demonstrated a novel polarization-insensitive crossing with crosstalk below -30 dB in the C-band.
    • Optimized intersecting angles significantly reduced signal interference.

    Conclusions:

    • Tilted MMI structures provide an effective solution for low-crosstalk waveguide crossings on silicon.
    • The developed polarization-insensitive design enhances performance for diverse optical applications.
    • These advancements contribute to more efficient and robust integrated photonic circuits.