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Polarization-insensitive antisymmetric multimode waveguide Bragg grating filter based on an SiN-Si dual-layer stack.

Nannan Ning, Hui Yu, Qiang Zhang

    Optics Letters
    |December 23, 2022
    PubMed
    Summary

    This study demonstrates a polarization-insensitive filter using a silicon nitride-silicon dual-layer stack. The novel multimode antisymmetric waveguide Bragg grating (MASWBG) filter achieves good performance for both TE and TM polarization states.

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    Area of Science:

    • Photonics
    • Materials Science
    • Optical Engineering

    Background:

    • Waveguide Bragg gratings are crucial optical components.
    • Achieving polarization-insensitivity in such devices is a significant challenge.
    • Existing designs often struggle with performance variations across different polarization states.

    Purpose of the Study:

    • To demonstrate a polarization-insensitive multimode antisymmetric waveguide Bragg grating (MASWBG) filter.
    • To utilize a silicon nitride-silicon dual-layer stack for enhanced optical performance.
    • To improve sidelobe suppression ratio (SLSR) using advanced fabrication techniques.

    Main Methods:

    • Fabrication of a dual-layer SiN-Si stack.
    • Design and optimization of grating corrugations on waveguide sidewalls and SiN overlay.
    • Application of the lateral-shift apodization technique for improved SLSR.
    • Characterization of filter performance for TE and TM polarization states.

    Main Results:

    • Demonstration of a polarization-insensitive MASWBG filter.
    • Achieved good overlap between passbands for TE and TM polarizations.
    • Measured insertion losses of 1/1.72 dB, SLSRs of 18.5/19.1 dB, and 3-dB bandwidths of 5.1/3.5 nm for TE/TM polarizations, respectively.

    Conclusions:

    • The demonstrated SiN-Si dual-layer MASWBG filter offers polarization-insensitive operation.
    • The optimized design and apodization technique effectively suppress sidelobes.
    • This device shows promise for applications requiring stable optical filtering across polarizations.