Comparison of Kolmogorov’s and coherent turbulence

Лукин, В. П.; Bolbasova, L. A.; Nosov, V. V.

doi:10.1364/ao.53.00b231

Cited by 20 publications

(9 citation statements)

References 17 publications

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“…First, we simulate the coupling efficiency fluctuations of 3 modes based on the Kolmogorov turbulence power spectral density [6] and Taylor's frozen screen theory [7] . The Kolmogorov turbulence model reflects the spatial characteristics of atmospheric turbulence.…”

Section: Sec 22 Turbulence Simulationmentioning

confidence: 99%

Real-time implementation of selection combining algorithm for mode diversity free space coherent optical receipt

Zhang,

Ouyang,

et al. 2024

Advanced Fiber Laser Conference (AFL2023)

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Atmospheric turbulence is a crucial factor affecting the performance of space optical communication systems. The mode diversity is considered an effective turbulence compensation method. In the mode diversity system, coherent combining algorithms are needed to combine the received signals from multiple modes to counteract the effects of turbulence. In this paper, we investigate the performance of 3 mode diversity coherent combining based on the selection combining (SC) algorithm in a 2.5 GBaud QPSK real-time back-to-back transmission system. We simulate turbulence with dynamic changes and calculate the bit error rate (BER) periodically. The experimental results show that within 1 second, the SC algorithm can reduce the frame error rate (FER) by 45% compared to using only single mode reception.

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Section: Sec 22 Turbulence Simulationmentioning

confidence: 99%

Real-time implementation of selection combining algorithm for mode diversity free space coherent optical receipt

Zhang,

Ouyang,

et al. 2024

Advanced Fiber Laser Conference (AFL2023)

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“…For a satellite positioned in either a low Earth orbit (LEO) or a geostationary orbit (GEO) with the transmitter on the ground, beam wander displacement variance of a Gaussian-beam wave (Θ 0 = 1) is plotted as a function of beam radius at the receiver in Figure 1, based on the three-layer beam wander model Equation (19). The zenith angle is set ζ = 0 deg, C 2 n (0) = 1.7 × 10 −15 m −2/3 and h 0 = 0 m are taken, respectively.…”

Section: Simulation and Analysismentioning

confidence: 99%

“…Finally, in order to find the influence of the variations of nominal value of refractiveindex structure parameter on the ground C 2 n (0) on beam wander, beam wander displacement variance of a Gaussian-beam wave (Θ 0 = 1) is plotted as a function of C 2 n (0) in Figure 3, based on the three-layer beam wander model Equation (19). The zenith angle is set ζ = 0 deg and W 0 = 0.2 m is taken.…”

Section: Simulation and Analysismentioning

confidence: 99%

“…IGW are anisotropic structures. Lukin et al [17][18][19] suggested a hypothesis that atmospheric coherent structures were principal causes of considerable deviations of the Kolmogorov and Obukhov constants from their standard values. Turbulence observed in a coherent structure is called coherent turbulence, which is different from noncoherent Kolmogorov turbulence.…”

Section: Introductionmentioning

confidence: 99%

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Wander of a Gaussian-Beam Wave Propagating through Kolmogorov and Non-Kolmogorov Turbulence along Laser-Satellite Communication Uplink

Fa-zhi

Yuan

et al. 2022

Atmosphere

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It is accepted that there exists two kinds of atmospheric turbulence in the Earth’s aerosphere—Kolmogorov and non-Kolmogorov turbulence; therefore, it is important to research their combined impacts on laser-satellite communications. In this paper, the exponential power spectra of refractive-index fluctuations for non-Kolmogorov turbulence in the free troposphere and stratosphere are proposed, respectively. Based on these two spectra, using the Markov approximation, beam wander displacement variances of a Gaussian-beam wave are derived, respectively, which are valid under weak turbulent fluctuations condition. On this basis, using a three-layer altitude-dependent turbulent spectrum model for vertical/slant path, the combined influence of a three-layer atmospheric turbulence on wander of a Gaussian-beam wave as the carrier wave in laser-satellite communication is studied. This three-layer spectrum is more accurate than a two-layer model. Moreover, the variations of beam wander displacement with beam radius, zenith angles, and nominal value of the refractive-index structure parameter on the ground are estimated. The theory of optical wave propagation through non-Kolmogorov atmospheric turbulence is further enriched and a theoretical model of a three-layer atmospheric turbulence beam wander for a satellite-ground laser communication uplink is established.

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“…A number of theoretical models have been proposed for accounting for turbulence containing coherence structures, which may be present in the close proximity of hard boundaries (see References [76,77] and references wherein). Such coherent structures appear because of the temperature or pressure gradients, and are formed as spatial vortices.…”

Section: Coherent Turbulencementioning

confidence: 99%

Non-Classic Atmospheric Optical Turbulence: Review

Korotkova

Toselli

2021

Applied Sciences

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Theoretical models and results of experimental campaigns relating to non-classic regimes occurring in atmospheric optical turbulence are overviewed. Non-classic turbulence may manifest itself through such phenomena as a varying power law of the refractive-index power spectrum, anisotropy, the presence of constant-temperature gradients and coherent structures. A brief historical introduction to the theories of optical turbulence, both classic and non-classic, is first presented. The effects of non-classic atmospheric turbulence on propagating light beams are then discussed, followed by the summary of results on measuring the non-classic turbulence, on its computer and in-lab simulations and its controlled synthesis. The general theory based on the extended Huygens–Fresnel method, capable of quantifying various effects of non-classic turbulence on propagating optical fields, including the increased light diffraction, beam profile deformations, etc., is then outlined. The review concludes by a summary of optical engineering applications that can be influenced by atmospheric non-classic turbulence, e.g., remote sensing, imaging and wireless optical communication systems. The review makes an accent on the results developed by the authors for the recent AFOSR MURI project on deep turbulence.

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Comparison of Kolmogorov’s and coherent turbulence

Cited by 20 publications

References 17 publications

Real-time implementation of selection combining algorithm for mode diversity free space coherent optical receipt

Real-time implementation of selection combining algorithm for mode diversity free space coherent optical receipt

Wander of a Gaussian-Beam Wave Propagating through Kolmogorov and Non-Kolmogorov Turbulence along Laser-Satellite Communication Uplink

Non-Classic Atmospheric Optical Turbulence: Review

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