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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Published on: March 20, 2017

Mode conversion coefficients in optical fibers.

W A Gambling, D N Payne, H Matsumura

    Applied Optics
    |February 16, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new method experimentally determines mode conversion coefficients in multimode fibers by analyzing far-field output. Mode coupling in liquid-core fibers increases significantly under pressure, with glass-core fibers showing much higher values.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Multimode fibers are crucial for optical communication and sensing.
    • Understanding mode conversion is essential for predicting signal behavior and loss.
    • Existing methods for measuring mode conversion can be complex.

    Purpose of the Study:

    • To develop a simple experimental method for determining mode conversion coefficients in multimode fibers.
    • To quantify the normalized mode coupling coefficient in liquid-core and glass-core fibers.
    • To investigate the effect of transverse pressure on mode coupling in liquid-core fibers.

    Main Methods:

    • The method involves observing the far-field output of a collimated input beam.
    • The angle of incidence of the input beam is systematically varied.
    • Mode coupling coefficients are calculated based on far-field patterns.

    Main Results:

    • A normalized mode coupling coefficient (D) of 3 x 10^-6 rad^2 m^-1 was measured in liquid-core fibers.
    • Applying transverse pressure increased the mode coupling coefficient in liquid-core fibers by up to a factor of 10.
    • Glass-core fibers exhibited mode coupling coefficients approximately two orders of magnitude larger than liquid-core fibers.

    Conclusions:

    • The devised method provides a straightforward approach for experimental determination of mode conversion coefficients.
    • Transverse pressure significantly influences mode coupling in liquid-core fibers.
    • Glass-core fibers demonstrate inherently higher mode coupling compared to liquid-core fibers, suggesting different loss mechanisms or structural properties.