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4 March 2019 Free space communication under scattering and scintillation effects
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Proceedings Volume 10910, Free-Space Laser Communications XXXI; 1091024 (2019)
Event: SPIE LASE, 2019, San Francisco, California, United States
A combination of scattering and scintillation effects is considered to compare the resilience of mid-IR and near-IR free space communication links. Beam-wander rw(t) under different scintillation conditions for mid-IR and near- IR beams are recorded simultaneously in real-time by a unique broad-band camera. The correlation coefficients show that both beams undergo the same pathway and experience the same scattering and scintillation effect which allows to identify and distill wavelength dependent effects. Using the frequency dependence in the observed beam wander allows for classification of our simulated atmospheric turbulence. Under these lab conditions, perceived refractive index structure parameter C_n^2 is extracted for each wavelength and a long-term radius is estimated for a long-distance link. In addition, the transmissivity and broadening of beams are calculated using discrete ordinate method to account for the scattering by fog. Considering both scattering and scintillation effects, the experimental and analytical results show that mid-IR (4.328 μm) beam has higher resilience in low visibility conditions compared to a near-IR (1.550 μm) beam.
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Ting Bu, Dayu Zhang, Prajnesh Kumar, Nan Chen, and Rainer Martini "Free space communication under scattering and scintillation effects", Proc. SPIE 10910, Free-Space Laser Communications XXXI, 1091024 (4 March 2019);

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