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Experimental demonstration of optical interconnects exploiting orbital angular momentum array.

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    Area of Science:

    • Optical communications
    • Information theory
    • Photonics

    Background:

    • Future optical interconnects require enhanced transmission capacity and integration.
    • Orbital Angular Momentum (OAM) offers a promising dimension for multiplexing in optical systems.
    • Current OAM schemes face limitations in encoding capacity and spatial utilization.

    Purpose of the Study:

    • To introduce a novel communication scheme utilizing orbital angular momentum (OAM) array encoding and decoding.
    • To enhance the transmission capacity and integration level of optical interconnect systems.
    • To explore the optimization of spatial dimensions for improved information throughput.

    Main Methods:

    • Development of an OAM array encoding/decoding scheme.
    • Optimization of spatial dimensions, including spatially orthogonal modes and spatial positions.
    • Experimental demonstration of 625-element and 1296-element high-base OAM array encoding/decoding.
    • Utilization of direct detection and simultaneous multi-OAM demodulation for decoding.
    • Evaluation of data and grey-scale image signal transmission under atmospheric turbulence.

    Main Results:

    • Successful demonstration of high-base OAM array encoding/decoding with 625 and 1296 elements.
    • Achieved significant improvement in information carried per symbol by optimizing spatial dimensions.
    • Validated the effectiveness of direct detection and simultaneous multi-OAM demodulation.
    • Demonstrated robust transmission of data and image signals through atmospheric turbulence.

    Conclusions:

    • The proposed OAM array encoding/decoding scheme significantly enhances transmission capacity for optical interconnects.
    • Optimizing spatial dimensions is crucial for maximizing information density in OAM-based communication.
    • The demonstrated method is effective for both data and image signal transmission, even in challenging environments like atmospheric turbulence.