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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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GPU accelerated toolbox for real-time beam-shaping in multimode fibres.

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    Optics Express
    |March 26, 2014
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    Summary

    We developed a GPU-accelerated toolbox to control light patterns in multimode fibers using a spatial light modulator (SLM). This system enables real-time shaping of light propagation for advanced optical applications.

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    Area of Science:

    • Optics and Photonics
    • Computational Physics
    • Materials Science

    Background:

    • Controlling light propagation in optical systems is crucial for various applications.
    • Multimode fibers (MMFs) present challenges for precise light manipulation due to complex mode coupling.
    • Spatial Light Modulators (SLMs) offer a way to shape light wavefronts.

    Purpose of the Study:

    • To present a GPU-accelerated toolbox for real-time light shaping through multimode fibers.
    • To optimize the acquisition of the fiber's transformation matrix.
    • To enable dynamic control of light patterns at the fiber's distal end.

    Main Methods:

    • Utilizing a spatial light modulator (SLM) to pre-modulate light before fiber coupling.
    • Synchronizing a CCD camera and SLM for rapid acquisition of the fiber's transformation matrix.
    • Employing GPU memory to store and process the transformation matrix for real-time holographic mask generation.
    • Integrating an acousto-optic deflector (AOD) to mitigate interference effects.

    Main Results:

    • Demonstrated real-time acquisition of the transformation matrix at 204 Hz.
    • Successfully displayed a user-controlled, oriented cube at the fiber's distal end.
    • Achieved on-demand control of the output light field and holographic mask within 20 ms intervals.
    • Eliminated deleterious interference using an AOD.

    Conclusions:

    • The developed GPU-accelerated toolbox provides efficient and real-time control over light propagation in multimode fibers.
    • The system's modular design allows for adaptation to other linear optical systems beyond MMFs.
    • This technology opens possibilities for advanced optical manipulation and imaging.