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Rectified phase-matching equation for fiber mode converter gratings using two-mode interference.

Soham Basu

    Optics Letters
    |October 1, 2020
    PubMed
    Summary

    Researchers developed a new method to predict fiber mode converter resonance wavelengths. This breakthrough enables precise estimation of modified intermodal phase, improving device design and performance.

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    Area of Science:

    • Photonics and Optical Engineering
    • Fiber Optic Devices
    • Waveguide Physics

    Background:

    • Resonance wavelength is critical for fiber mode converter gratings, influencing device performance.
    • Predicting this wavelength accurately for new setups has been a significant challenge.
    • A lack of experimental methods to estimate modified intermodal phase after grating inscription hindered progress.

    Purpose of the Study:

    • To introduce a novel method for precisely predicting the resonance wavelength of fiber mode converters.
    • To establish a direct experimental technique for estimating modified intermodal phase.
    • To bridge the gap between theoretical prediction and experimental validation in mode converter design.

    Main Methods:

    • Developed a novel mathematical connection between two-mode interference and mode conversion.
    • Utilized a single experiment to estimate modified intermodal phase over a broad wavelength range.
    • Applied the new method to predict resonance wavelengths for various grating configurations.

    Main Results:

    • Successfully predicted experimentally measured resonance wavelengths with high accuracy.
    • Achieved relative errors as low as 4×10⁻³ for different pitch and irradiation conditions.
    • Demonstrated the method's effectiveness across a broad wavelength spectrum.

    Conclusions:

    • The presented method provides a reliable way to predict fiber mode converter resonance wavelengths.
    • This advancement facilitates more accurate design and fabrication of fiber optic devices.
    • The novel approach overcomes previous limitations in experimental phase estimation.