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Multimode optical waveguide enabling microbends with low inter-mode crosstalk for mode-multiplexed optical

Daoxin Dai

    Optics Express
    |November 18, 2014
    PubMed
    Summary
    This summary is machine-generated.

    A novel vertical multimode waveguide enables compact optical interconnects with micro-bends. This silicon-on-insulator waveguide demonstrates low inter-mode crosstalk for efficient mode-multiplexing links.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Waveguide Technology

    Background:

    • Mode-multiplexing optical interconnects are crucial for high-bandwidth data transmission.
    • Traditional lateral multimode waveguides face limitations in miniaturization due to large bending radii.
    • Vertical waveguide designs offer potential for more compact optical circuits.

    Purpose of the Study:

    • To propose and analyze a vertical multimode waveguide capable of supporting micro-bends.
    • To investigate the bending loss and inter-mode crosstalk characteristics of this novel waveguide structure.
    • To demonstrate the feasibility of compact mode-multiplexing links using vertical multimode waveguides.

    Main Methods:

    • Design and theoretical analysis of a silicon-on-insulator (SOI) based vertical multimode waveguide.
    • Simulation of light propagation through straight and bent sections of the waveguide.
    • Characterization of pure bending loss and inter-mode crosstalk for various bending radii and supported modes.

    Main Results:

    • The proposed vertical multimode waveguide exhibits negligible pure bending loss for the lowest eight modes at bending radii below 5μm.
    • Significant mode hybridization occurs in sharply bent sections, leading to inter-mode crosstalk.
    • For a bending radius of 10μm, inter-mode crosstalk is below -20dB, significantly smaller than traditional lateral waveguides.
    • Inter-mode crosstalk can be reduced to -30dB with a bending radius of 30μm.

    Conclusions:

    • The vertical multimode waveguide is a promising platform for realizing compact mode-multiplexing optical interconnects.
    • The demonstrated low inter-mode crosstalk at small bending radii overcomes limitations of conventional designs.
    • This technology enables denser integration of optical components for future high-speed communication systems.