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    This study presents a dual-mode waveguide crossing using multimode interference couplers for on-chip optical interconnects. The device achieves low insertion loss and crosstalk for TM0 and TM1 modes over a wide bandwidth.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Waveguide Technology

    Background:

    • On-chip optical interconnects require efficient methods for routing optical signals.
    • Multimode waveguides offer potential for increased data capacity but present challenges in signal management.

    Purpose of the Study:

    • To propose and realize a dual-mode waveguide crossing for on-chip multimode interconnection.
    • To enable simultaneous routing of TM0 and TM1 modes with minimal loss and crosstalk.

    Main Methods:

    • Utilizing two 90° crossed multimode-interference (MMI) couplers.
    • Optimizing the width and length of the MMI sections to achieve self-imaging for both TM0 and TM1 modes.

    Main Results:

    • Demonstrated a functional dual-mode waveguide crossing.
    • Achieved low insertion loss (<1.5 dB) and low crosstalk (<-18 dB).
    • Observed performance over a broad bandwidth (>80 nm) for both TM0 and TM1 modes.

    Conclusions:

    • The proposed dual-mode waveguide crossing is effective for on-chip multimode interconnection.
    • The MMI-based design offers a practical solution for managing multiple modes in integrated photonic circuits.
    • The device exhibits excellent performance characteristics suitable for advanced optical networking applications.