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Aperture averaging in multiple-input single-output free-space optical systems using partially coherent radial array

Muhsin Caner Gökçe, Yahya Baykal, Murat Uysal

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |July 14, 2016
    PubMed
    Summary

    This study analyzes multiple-input single-output (MISO) free-space optical (FSO) links with partially coherent sources and finite receivers. It quantifies performance metrics like scintillation and aperture averaging under atmospheric turbulence.

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    Area of Science:

    • Optical communications
    • Atmospheric optics
    • Signal processing

    Background:

    • Atmospheric turbulence significantly degrades free-space optical (FSO) link performance.
    • Multiple-input single-output (MISO) systems offer a strategy to mitigate these effects.
    • Partially coherent sources and finite receiver apertures are practical considerations in FSO system design.

    Purpose of the Study:

    • To investigate the performance of a MISO FSO system employing a partially coherent radial array transmitter and a finite-sized receiver aperture.
    • To analyze the impact of various system parameters on power scintillation and aperture averaging.
    • To validate the theoretical model against existing results for coherent and partially coherent Gaussian beams.

    Main Methods:

    • Utilized the extended Huygens-Fresnel principle to model the optical wave propagation.
    • Formulated expressions for average power and power correlation at a finite-sized detector.
    • Calculated key performance indicators including the power scintillation index and aperture averaging factor.

    Main Results:

    • Determined the influence of source size, ring radius, receiver aperture radius, link distance, and atmospheric structure constant on system performance.
    • Quantified the effect of the degree of source coherence on the MISO FSO link.
    • Demonstrated agreement of numerical results with established scintillation indices in limiting cases.

    Conclusions:

    • The study provides a comprehensive analysis of MISO FSO systems with partially coherent sources and finite receivers.
    • The findings offer insights into optimizing FSO system design for enhanced robustness against atmospheric turbulence.
    • The developed model is validated and applicable for performance prediction in weak turbulence regimes.