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Supercontinuum noise reduction by fiber undertapering.

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    Summary

    Undertapering a fiber optic cable significantly reduces noise in supercontinuum sources. This novel technique controls soliton behavior, lowering Relative Intensity Noise (RIN) by over 50% in key spectral bands.

    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science

    Background:

    • Supercontinuum sources are crucial for various applications.
    • High Relative Intensity Noise (RIN) in supercontinuum sources limits their performance.
    • Current methods for RIN reduction are often complex or inefficient.

    Purpose of the Study:

    • To introduce and validate the concept of undertapering for RIN reduction in supercontinuum sources.
    • To demonstrate the mechanism by which undertapering controls soliton dynamics.
    • To quantify the RIN reduction achieved using undertapering in specific spectral regions.

    Main Methods:

    • Fabrication of optical fibers tapered to diameters smaller than the optimum for shortest blue edge.
    • Characterization of fiber properties and spectral output of supercontinuum generation.

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  • Analysis of soliton dynamics and spectral redshifting control.
  • Measurement of spectrally averaged RIN in the 500-800nm and 1150-1450nm bands.

    • Main Results:

    • Undertapering enables precise control over the second zero dispersion wavelength.
    • This control acts as a soliton barrier, preventing excessive redshifting.
    • Spectrally averaged RIN was reduced by more than a factor of two in the targeted Optical Coherence Tomography (OCT) bands.

    Conclusions:

    • Undertapering is an effective and novel method for significantly reducing RIN in supercontinuum sources.
    • This technique offers improved performance for applications utilizing supercontinuum light, particularly in OCT.
    • The ability to control soliton redshifting via undertapering opens new avenues for optimizing fiber-based light sources.