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    Area of Science:

    • Optics
    • Optical Communications
    • Atmospheric Optics

    Background:

    • Modulating retro-reflectors are used in communication links.
    • Atmospheric turbulence can cause signal fading, impacting data transfer rates.
    • Understanding irradiance fluctuations is key to optimizing performance.

    Purpose of the Study:

    • To investigate the impact of atmospheric turbulence on retro-reflected optical signals.
    • To measure irradiance and scintillation in direct and retro-reflected beams.
    • To correlate irradiance fluctuations between direct and double-passage paths to optimize data transfer.

    Main Methods:

    • Experiments conducted over a 1.8 km terrestrial range.
    • Measurement of irradiance in both on-axis and off-axis components for direct and retro-reflected beams.
    • Comparison of measured scintillation indices and correlations with theoretical models.

    Main Results:

    • High degree of correlation (up to 90% on-axis, 70% off-axis) observed between direct and double-passage beams.
    • Enhanced scintillation index in the retro-reflected beam due to reciprocal optical paths.
    • Scintillation indices and correlations compared with point source/scatterer/receiver models.

    Conclusions:

    • Turbulence-induced fade information can optimize data transfer rates in retro-reflector systems.
    • Reciprocal optical paths enhance scintillation in retro-reflected beams.
    • Experimental data aligns with theoretical models in strong scintillation conditions.