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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Ultra-broadband polarization-insensitive dual-mode silicon waveguide crossing enabled by subwavelength

Zhiyuan Gao, Chen Zhang, Jun Feng

    Optics Letters
    |January 15, 2026
    PubMed
    Summary

    This study presents an ultra-broadband silicon waveguide crossing that supports dual modes and is insensitive to polarization. This breakthrough enables high-capacity photonic integration by minimizing signal loss and crosstalk.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Nanophotonics

    Background:

    • Silicon photonics is crucial for high-capacity optical communication.
    • Waveguide crossings are essential components in integrated photonic circuits.
    • Achieving broadband, polarization-insensitive, and low-crosstalk crossings remains a challenge.

    Purpose of the Study:

    • To demonstrate an ultra-broadband, polarization-insensitive, dual-mode silicon waveguide crossing.
    • To enable high-capacity multimode photonic integration.

    Main Methods:

    • Utilized subwavelength grating (SWG) array-assisted multimode engineering.
    • Incorporated multi-row nano-hole SWG arrays and fan-shaped bent SWGs.
    • Simulated and experimentally validated performance on a 220nm silicon-on-insulator (SOI) platform.

    Main Results:

    • Achieved insertion losses (ILs) below 0.46 dB and crosstalk (CT) below -24 dB at 1550 nm for TE0, TM0, TE1, and TM1 modes.
    • Maintained ILs below 1 dB and CT below -22 dB across the 1260-1675 nm ultra-broadband range.
    • Experimentally verified ILs below 1 dB and CT below -20 dB from 1300 to 1650 nm.

    Conclusions:

    • The proposed SWG-assisted dual-mode waveguide crossing offers record bandwidth.
    • Demonstrated full dual-polarization support for advanced photonic integration.
    • Paves the way for next-generation high-capacity optical communication systems.