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Dynamically adjustable astigmatic transformations for OAM mode identification under atmospheric turbulence.

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    This study presents a novel method for identifying orbital angular momentum (OAM) states in free-space optical communications, showing high accuracy even in strong atmospheric turbulence.

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    Area of Science:

    • Optical Communications
    • Quantum Information Science

    Background:

    • Free-space optical communication links utilize orbital angular momentum (OAM) shift-keying for enhanced data transmission.
    • Receiver performance in OAM-based systems is critically dependent on accurately recovering the OAM state, especially under atmospheric turbulence.

    Purpose of the Study:

    • To develop and evaluate a novel method for OAM mode identification that demonstrates resilience to atmospheric turbulence.
    • To assess the detection accuracy and robustness of the proposed method across a range of OAM states.

    Main Methods:

    • Simulated atmospheric turbulence using Monte-Carlo phase screens generated with the subharmonic method and modified Von Kármán power spectral density.
    • Employed spatial light modulators to generate customized interference patterns for OAM mode identification.
    • Investigated an optimized astigmatic interference pattern for enhanced performance.

    Main Results:

    • The proposed OAM mode identification method exhibited low sensitivity to beam misalignment.
    • Reliable performance was demonstrated even under conditions of strong atmospheric turbulence.
    • Achieved very high detection accuracy for OAM states ranging from 7 to 63.

    Conclusions:

    • The novel OAM mode identification technique offers a robust solution for free-space optical communication systems operating in turbulent environments.
    • The method's ability to maintain high accuracy under strong turbulence makes it suitable for practical OAM-based communication links.