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Compact and low-insertion-loss polarization beam-splitting multimode filter using pixelated waveguides.

Lingxiao Ma, Tao Jin, Runkui Yao

    Optics Express
    |April 4, 2024
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a compact polarization beam-splitting filter using pixelated waveguides. The device achieves excellent performance, including low insertion loss and high extinction ratios across a broad wavelength range.

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    Area of Science:

    • Photonics and Optical Engineering
    • Nanophotonics
    • Waveguide Technology

    Background:

    • Polarization beam splitters are crucial optical components for various applications.
    • Existing devices often face limitations in size, bandwidth, or performance.
    • Pixelated waveguides offer a novel approach for miniaturized and high-performance optical devices.

    Purpose of the Study:

    • To design and experimentally demonstrate a polarization beam-splitting multimode filter.
    • To optimize pixelated waveguides for compact size, broad bandwidth, and high extinction ratios.
    • To achieve low insertion loss and excellent polarization extinction ratio.

    Main Methods:

    • Utilizing the Finite Difference Time Domain (FDTD) method for electromagnetic wave simulation.
    • Employing a direct binary search (DBS) optimization algorithm for waveguide design.
    • Fabricating and experimentally characterizing the pixelated waveguide device.

    Main Results:

    • Demonstrated a polarization beam-splitting filter with a device length of only 15.4 µm.
    • Achieved insertion loss < 1.23 dB for transverse-electric (TE) and < 0.74 dB for transverse-magnetic (TM) polarization.
    • Obtained extinction ratios > 15.14 dB (TE) and > 15.50 dB (TM), with a polarization extinction ratio > 15.02 dB.
    • Device operates effectively over a broad wavelength range (1520–1560 nm).

    Conclusions:

    • Pixelated waveguides enable the creation of highly efficient and compact polarization beam-splitting filters.
    • The demonstrated device meets key performance metrics for practical optical systems.
    • This technology holds promise for advancements in integrated photonics and optical communication systems.