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Nonlinear characterization of a silicon integrated Bragg waveguide filter.

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    Bragg waveguides effectively suppress unwanted photon pairs in optical filters. This study confirms stimulated four-wave mixing (FWM) accurately characterizes integrated filter nonlinearity, ensuring reliable nonclassical photon sources.

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    Area of Science:

    • Quantum optics
    • Integrated photonics
    • Nonlinear optics

    Background:

    • Bragg waveguides are key optical filters for suppressing pump light in spontaneous four-wave mixing (FWM) photon sources.
    • Investigating unwanted photon pair generation within these filters is crucial for optimizing nonclassical light sources.

    Purpose of the Study:

    • To investigate and quantify unwanted photon pair generation within Bragg waveguide filters.
    • To validate the use of classical FWM for characterizing the nonlinear response of integrated optical filters.
    • To assess the impact of Bragg waveguide-generated pairs on the performance of nonclassical photon sources.

    Main Methods:

    • Utilizing the relationship between spontaneous and classical four-wave mixing (FWM) for device characterization.
    • Employing classical FWM measurements to determine the nonlinear response of the Bragg waveguide.
    • Comparing experimental pair generation rates with theoretical predictions from a full quantum model.

    Main Results:

    • A good agreement was found between experimental measurements and theoretical predictions.
    • Stimulated FWM was confirmed as a reliable method for characterizing integrated filter nonlinearity.
    • Photon pairs generated within the Bragg waveguide were found to be insignificant for integrated nonclassical source operation.

    Conclusions:

    • Bragg waveguides are suitable for pump suppression in nonclassical photon sources.
    • Classical FWM provides an accurate method for nonlinear response characterization of integrated photonic devices.
    • The generated photon pairs in Bragg waveguides do not pose a significant issue for integrated nonclassical light sources.