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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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High-dimensional signal encoding and decoding method based on multi-ring perfect vortex beam.

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    Researchers developed a multi-ring perfect optical vortex beam (MR-POVB) for enhanced free-space optical communication. This novel beam improves channel capacity and decoding accuracy using advanced encoding and machine learning techniques.

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    Area of Science:

    • Optics and Photonics
    • Optical Communications
    • Machine Learning Applications

    Background:

    • Perfect optical vortex beams (POVB) offer stable beam radius across orbital angular momentum (OAM) modes, beneficial for optical tweezers and communication.
    • Existing optical communication methods face limitations in channel capacity and decoding accuracy.

    Purpose of the Study:

    • To create a multi-ring perfect optical vortex beam (MR-POVB) by superposing multiple POVBs.
    • To develop a novel encoding and decoding technique for MR-POVB to enhance free-space optical communication.
    • To improve channel capacity and decoding accuracy in optical communication systems.

    Main Methods:

    • Superposition of multiple POVBs to generate MR-POVB.
    • Novel encoding method using predefined rules for beam transmission.
    • Machine learning-based code group selection (cosine similarity and spectral clustering).
    • Deep learning approach for decoding based on petal-like patterns from coaxial interference.

    Main Results:

    • Successful generation of MR-POVB with adjustable topological charges, radii, and intensities.
    • Demonstrated augmentation of free-space optical communication channel capacity.
    • Achieved enhanced decoding accuracy through machine learning and deep learning techniques.

    Conclusions:

    • The MR-POVB encoding and decoding technique significantly boosts channel capacity in free-space optical communication.
    • The study demonstrates improved decoding accuracy, paving the way for advanced optical communication systems.
    • This research contributes to the advancement of optical communication technologies through innovative beam design and intelligent signal processing.