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Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
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Multi-image transmission based on a multi-channel OAM-array-coded optical communication system using a designed

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    This study introduces a method for generating vortex beam (VB) arrays with multiple orbital angular momenta (OAMs) for high-capacity optical communications. The VB array system successfully transmitted multiple images, demonstrating its potential for advanced communication systems.

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    Area of Science:

    • Optical communications
    • Beam physics
    • Information theory

    Background:

    • Vortex beams (VBs) offer potential for high-capacity optical communications.
    • Limited capacity of typical VBs due to single orbital angular momentum (OAM) hinders practical applications.

    Purpose of the Study:

    • To propose and demonstrate a method for simultaneous generation of high-quality VB arrays with multiple OAMs.
    • To develop a multi-channel optical communication system utilizing these VB arrays.
    • To enhance the capacity and versatility of VB-based communication.

    Main Methods:

    • Controllable simultaneous generation of VB arrays with multiple OAMs.
    • Implementation of a VB array-based multi-channel optical communication system.
    • Integration of a custom-designed Dammam grating and an integrated vortex grating.
    • Utilizing a single-input multiple-output deep learning recognition model for signal processing.

    Main Results:

    • Successful experimental demonstration of simultaneous transmission of four grayscale images.
    • Achieved an average error rate of less than 0.003 without turbulence.
    • Demonstrated an average error rate of 0.061 in the presence of turbulence.

    Conclusions:

    • The proposed multi-channel method significantly increases the versatility of VB arrays.
    • This approach broadens the application of VB arrays in high-capacity optical communications.
    • The system shows robustness in the presence of optical turbulence.