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Filter synthesis for periodically coupled microring resonators.

B E Little, S T Chu, J V Hryniewicz

    Optics Letters
    |December 7, 2007
    PubMed
    Summary
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    This study introduces a new theory for designing filters using coupled microring resonators. This approach enhances filter performance and overcomes fabrication challenges for precise spectral characteristics.

    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Resonator Systems

    Background:

    • Conventional higher-order filters face fabrication sensitivities impacting spectral characteristics.
    • Achieving desirable filter shapes and high extinction ratios remains a challenge.

    Purpose of the Study:

    • To develop a theory for filter synthesis using periodically coupled microring resonators.
    • To overcome fabrication sensitivities in higher-order filter design.
    • To achieve desirable spectral characteristics, including boxlike shapes and high extinction ratios.

    Main Methods:

    • Development of filter synthesis theory based on periodically coupled microring resonators.
    • Analysis of resonator interactions for mutual compensation of deficiencies.

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  • Theoretical modeling of filter performance.

    • Main Results:

    • The proposed theory enables filter design that compensates for fabrication imperfections.
    • Microring resonator arrays demonstrate inherent robustness to manufacturing variations.
    • Filters synthesized using this method exhibit boxlike spectral shapes.
    • Very high extinction ratios are achieved with the proposed filter design.

    Conclusions:

    • Periodically coupled microring resonators offer a viable solution for robust, high-performance filter synthesis.
    • This theoretical framework addresses key limitations of conventional filter fabrication.
    • The developed method facilitates the creation of filters with superior spectral control and signal isolation.