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Spatially distributed delay line interferometer based on transmission Bragg scattering.

Miguel A Preciado, Atalla El-Taher, Kate Sugden

    Optics Letters
    |August 30, 2019
    PubMed
    Summary
    This summary is machine-generated.

    A new Bragg grating (BG) method enables delay line interferometer (DLI) functionality using a single optical path. This novel approach simplifies DLI design and is compatible with various BG technologies.

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    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Nanophotonics

    Background:

    • Conventional delay line interferometers (DLIs) typically require two separate interfering optical paths.
    • Bragg gratings (BGs) are widely used in optical devices but not traditionally for DLI functionality.

    Purpose of the Study:

    • To propose and demonstrate a novel DLI approach utilizing Bragg gratings in transmission mode.
    • To show that a single common optical path can achieve DLI functionality with BGs.

    Main Methods:

    • Numerical simulations were performed to model the proposed DLI concept.
    • Phase-modulated fiber Bragg gratings (BGs) were designed and fabricated as a proof of concept.
    • Experimental validation of the DLI functionality in transmission mode was conducted.

    Main Results:

    • The study successfully demonstrated that a Bragg grating can function as a DLI in its transmission mode.
    • A single common interfering optical path was achieved, differing from conventional DLI setups.
    • Fabricated fiber BGs exhibited the desired DLI functionality.

    Conclusions:

    • A novel and simplified DLI approach based on transmission Bragg scattering is presented.
    • This method offers a new way to implement DLI functionality using BGs.
    • The approach is versatile and applicable to various Bragg grating technologies, including silicon photonics.