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Silicon lateral-apodized add-drop filter for on-chip optical interconnection.

Jianfei Jiang, Huiye Qiu, Gencheng Wang

    Applied Optics
    |November 2, 2017
    PubMed
    Summary
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    This study demonstrates a novel lateral-apodized add-drop filter using asymmetric waveguide Bragg gratings. The design achieves significant side-lobe suppression and low insertion loss, offering an easier realization compared to other apodized technologies.

    Area of Science:

    • Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Waveguide Bragg gratings are crucial for optical filtering.
    • Traditional designs often suffer from strong side lobes, impacting performance.
    • Apodization techniques are used to suppress side lobes but can be complex to implement.

    Purpose of the Study:

    • To demonstrate a novel lateral-apodized add-drop filter.
    • To achieve efficient side-lobe suppression in multimode asymmetric waveguide Bragg gratings.
    • To present an easier-to-realize apodized filter design.

    Main Methods:

    • Utilizing two individual superposed gratings with identical sidewall corrugation depth.
    • Mapping the target apodization profile into lateral shifts between grating periods.

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  • Fabricating and experimentally testing the designed add-drop filter.

    • Main Results:

    • Achieved a side-lobe suppression ratio of 18.5 dB.
    • Obtained a filter bandwidth of 9.5 nm with a 150 nm corrugation width.
    • Demonstrated low insertion loss (0.8 dB) at the drop port and high extinction ratio (24 dB) at the through port.

    Conclusions:

    • The lateral-apodization technique offers an effective and simpler method for fabricating high-performance waveguide Bragg grating filters.
    • The demonstrated device shows excellent performance metrics suitable for various optical communication applications.
    • This approach provides a practical solution for suppressing side lobes in optical filters.