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What is a Mode?01:07

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Writing Bragg Gratings in Multicore Fibers
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Compact double-part grating coupler for higher-order mode coupling.

Yaxiao Lai, Yu Yu, Songnian Fu

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    Summary
    This summary is machine-generated.

    We developed a compact grating coupler for efficient fiber-to-chip connections. This novel design achieves high coupling efficiency and low crosstalk using a double-part grating and curved Y-junction.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Nanophotonics

    Background:

    • Efficient fiber-to-chip coupling is crucial for integrated photonic circuits.
    • Traditional grating couplers face limitations in efficiency and crosstalk.
    • First-order mode coupling is essential for advanced optical functionalities.

    Purpose of the Study:

    • To propose and demonstrate a compact and efficient grating coupler for first-order mode fiber-to-chip coupling.
    • To improve coupling efficiency and reduce crosstalk compared to traditional designs.
    • To investigate the performance of the coupler for fundamental mode operation.

    Main Methods:

    • Utilizing a double-part grating structure combined with a curved Y-junction.
    • Employing mode diversity for enhanced performance.
    • Minimizing grating taper lengths for compactness.

    Main Results:

    • Achieved a peak coupling efficiency of -3.68 dB at a 20 μm taper length.
    • Measured a 1 dB bandwidth of 35 nm.
    • Demonstrated reduced crosstalk below -15 dB across the operational band for the fundamental mode.

    Conclusions:

    • The proposed double-part grating coupler offers a compact and efficient solution for fiber-to-chip integration.
    • The design effectively enhances coupling efficiency and minimizes crosstalk.
    • This technology holds promise for advanced integrated photonic applications requiring high-performance mode coupling.