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Beam-oscillation suppressor for multimode gradient-index fibers.

W K Kahn, S Yang

    Optics Letters
    |August 29, 2009
    PubMed
    Summary

    Beam oscillations in gradient-index fibers can be suppressed using coupled fibers. This study demonstrates how Liouville

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    Area of Science:

    • Optical Physics
    • Fiber Optics
    • Wave Propagation

    Background:

    • Eccentric beam injection into gradient-index fibers typically causes undesirable oscillations about the fiber axis.
    • Previous understanding suggested Liouville's theorem precluded suppression of these oscillations.

    Purpose of the Study:

    • To investigate methods for suppressing beam oscillations in gradient-index fibers.
    • To demonstrate the feasibility of oscillation suppression despite Liouville's theorem.
    • To determine the required length of a coupled-fiber system for this effect.

    Main Methods:

    • Theoretical analysis of beam propagation in a system of two coupled gradient-index fibers.
    • Application of Liouville's theorem to the coupled-fiber system.
    • Derivation of the operational length for the coupled-fiber section.

    Main Results:

    • Substantial suppression of oscillations about the fiber axis is achievable.
    • The constraint of Liouville's theorem is satisfied within the coupled-fiber system.
    • The specific length of the coupled-fiber section necessary for this suppression has been determined.

    Conclusions:

    • Beam oscillations in gradient-index fibers can be effectively suppressed.
    • A coupled-fiber system provides a viable mechanism for oscillation suppression, consistent with Liouville's theorem.
    • The operational length is a critical parameter for achieving this effect.

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