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Related Experiment Videos

Integrated high rejection ratio pump filter using an optimized waveguide Bragg grating.

Yang Zhang, Mario Dagenais

    Optics Express
    |February 20, 2026
    PubMed
    Summary
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    Optics express·2023

    A novel z-shaped Bragg grating filter achieves 83 dB extinction ratio, suppressing strong pump fields for quantum photonics and optical communication. This compact, high-rejection filter is ideal for advanced photonic applications.

    Area of Science:

    • Photonics
    • Quantum Optics
    • Optical Engineering

    Background:

    • Ultra-high rejection optical filters are crucial for isolating weak signals in quantum photonics, nonlinear optics, and communications.
    • Bragg gratings offer compactness and CMOS compatibility but are often limited by leakage noise, hindering rejection levels.

    Purpose of the Study:

    • To develop a Bragg grating filter with significantly enhanced rejection capabilities.
    • To mitigate unwanted modes and scattering in on-chip optical filters.
    • To provide a compact and stable high-rejection filter for photonic integration.

    Main Methods:

    • Design and fabrication of a z-shaped Bragg grating structure.
    • Characterization of the filter's extinction ratio and performance.

    Related Experiment Videos

  • Analysis of mode suppression and scattering mitigation techniques.

    • Main Results:

    • Achieved an unprecedented extinction ratio of 83 dB.
    • Demonstrated stable high-rejection performance through experimental validation.
    • The z-shaped design effectively suppressed unwanted modes and scattering.

    Conclusions:

    • The z-shaped Bragg grating filter offers a breakthrough in optical filter rejection.
    • This technology is a promising candidate for integration into quantum photonic circuits and other advanced photonic systems.
    • The filter's performance addresses key limitations in current optical filtering technologies.