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Rayleigh longitudinal profiling of optical resonances within waveguide grating structures using sidescattered light.

J Canning, M Janos, M G Sceats

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    Summary

    Measuring Rayleigh scattering reveals Bragg grating characteristics. This method provides insights into the standing-wave intensity profile, unachievable with standard spectra analysis.

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    Area of Science:

    • Optics and Photonics
    • Fiber Optic Sensors
    • Materials Science

    Background:

    • Bragg gratings in fibers are crucial optical components.
    • Standard characterization relies on transmission and reflection spectra.
    • These methods offer limited information on internal grating properties.

    Purpose of the Study:

    • To characterize the resonant properties of fiber Bragg gratings (FBGs).
    • To explore an alternative method for analyzing the standing-wave intensity profile within FBGs.
    • To compare the information obtained from Rayleigh scattering with traditional spectral analysis.

    Main Methods:

    • Measurement of wavelength-dependent Rayleigh scattering.
    • Light propagation along the grating length within the fiber core.
    • Analysis of scattering patterns to infer grating characteristics.

    Main Results:

    • Rayleigh scattering measurements provide detailed information on FBG resonant characteristics.
    • The technique successfully maps the standing-wave intensity profile within the grating.
    • This profile information is not accessible through conventional transmission or reflection spectra.

    Conclusions:

    • Rayleigh scattering is a valuable technique for characterizing FBGs.
    • It offers unique insights into the internal standing-wave intensity distribution.
    • This method complements and extends traditional spectral analysis techniques for FBGs.