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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Intermodal modulational instability in graded-index multimode optical fibers.

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    We observed a novel intermodal noise-seeded modulational instability in optical fibers. Its spectral characteristics strongly depend on light power, matching theoretical models.

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    Area of Science:

    • Nonlinear optics
    • Optical fiber communications

    Background:

    • Modulational instability (MI) is a fundamental nonlinear phenomenon in optics.
    • Understanding MI in few-mode fibers is crucial for advanced optical systems.

    Purpose of the Study:

    • To experimentally observe and characterize intermodal noise-seeded modulational instability (MI) in a few-mode fiber.
    • To investigate the power dependence of the MI spectra and compare with theoretical predictions.

    Main Methods:

    • Experimental setup utilizing a few-mode graded-index optical fiber.
    • Observation of intermodal noise-seeded modulational instability (MI).
    • Analysis of MI spectra and peak gain modulation frequency.

    Main Results:

    • Experimental confirmation of intermodal noise-seeded MI in the normal dispersion regime.
    • Observed strong power dependence of MI spectra.
    • Peak gain modulation frequency scales with the square root of injected light power.

    Conclusions:

    • The experimental results align well with a bimodal-MI model.
    • This study advances the understanding of nonlinear phenomena in few-mode optical fibers.