Results 61 to 70 of about 947,860 (252)

Performance analysis of optical wireless communications with aperture averaging over exponentiated Weibull turbulence with pointing errors

Results in Optics, 2021
Aperture averaging (AA) is a potential technique to reduce the effect of atmospheric turbulence in optical wireless communications (OWC). Although there is significant research on point-like detectors, there is a gap in the study on the analytical ...
Ziyaur Rahman, Syed Mohammad Zafaruddin, Vinod Kumar Chaubey   +2 more
doaj   +1 more source

Modulation Transfer Function of a Gaussian Beam Based on the Generalized Modified Atmospheric Spectrum

International Journal of Optics, 2016
This paper investigates the modulation transfer function of a Gaussian beam propagating through a horizontal path in weak-fluctuation non-Kolmogorov turbulence. Mathematical expressions are obtained based on the generalized modified atmospheric spectrum,
Chao Gao, Xiaofeng Li
doaj   +1 more source

Evolution Properties of a Partially Coherent Twisted Laguerre-Gaussian Pulsed Beam Propagating through Anisotropic Atmospheric Turbulence

Photonics, 2022
Analytical expressions for the cross-spectral density matrix of a partially coherent twisted Laguerre-Gaussian pulsed (PCTLGP) beam in anisotropic atmospheric turbulence are derived based on the extended Huygens–Fresnel principle.
Ying Xu, Yonggen Xu, Tiejun Wang
doaj   +1 more source

Robust propagation of pin-like optical beam through atmospheric turbulence

APL Photonics, 2019
We design and demonstrate what we called shape-preserving “optical pin beams” (OPBs) that possess stable wavefronts against diffraction and ambient turbulence during free-space long distance propagation.
Ze Zhang, Xinli Liang, Mihalis Goutsoulas, Denghui Li, Xiuting Yang, S. Yin, Jingjun Xu, D. Christodoulides, N. Efremidis, Zhigang Chen   +9 more
semanticscholar   +1 more source

Restoration of atmospheric turbulence-distorted images via RPCA and quasiconformal maps [PDF]

Inverse Problems, 2017
We address the problem of restoring a high-quality image from an observed image sequence strongly distorted by atmospheric turbulence. A novel algorithm is proposed in this paper to reduce geometric distortion as well as space-and-time-varying blur due ...
Chun Pong Lau, Y. Lai, L. Lui
semanticscholar   +1 more source

Multistep ahead atmospheric optical turbulence forecasting for free-space optical communication using empirical mode decomposition and LSTM-based sequence-to-sequence learning

Frontiers in Physics, 2023
Although free-space optical communication (FSOC) is a promising means of high data rate satellite-to-ground communication, beam distortion caused by atmospheric optical turbulence remains a major challenge for its engineering applications.
Yalin Li, Hongqun Zhang, Lang Li, Lang Li, Lang Li, Lu Shi, Lu Shi, Yan Huang, Shiyao Fu, Shiyao Fu, Shiyao Fu   +10 more
doaj   +1 more source

Østerild: A natural laboratory for atmospheric turbulence

Journal of Renewable and Sustainable Energy, 2019
Understanding atmospheric turbulence is without a doubt one of the most complex subjects in meteorology. However, its behavior can be more easily investigated by analysis of high-quality measurements of the velocity and temperature fluctuations. Here, we
A. Peña
semanticscholar   +1 more source

Effects of Atmospheric Turbulence on Lensless Ghost Imaging with Partially Coherent Light

Applied Sciences, 2018
Ghost imaging with partially coherent light through two kinds of atmospheric turbulences: monostatic turbulence and bistatic turbulence, is studied, both theoretically and experimentally.
Xianlong Liu, Fei Wang, Minghui Zhang, Yangjian Cai   +3 more
doaj   +1 more source

Joint atmospheric turbulence detection and adaptive demodulation technique using the CNN for the OAM-FSO communication.

Optics Express, 2018
A novel joint atmospheric turbulence (AT) detection and adaptive demodulation technique based on convolutional neural network (CNN) are proposed for the OAM-based free-space optical (FSO) communication.
Jin Li, M. Zhang, Danshi Wang, Shaojun Wu, Yueying Zhan   +4 more
semanticscholar   +1 more source

Enhancing Performance of Air–Ground OAM Communication System Utilizing Vector Vortex Beams in the Atmosphere

Photonics, 2022
The modified uplink and downlink atmospheric turbulence channel models were established and employed to assess the system performance of air–ground orbital angular momentum (OAM) communication.
Mingjian Cheng, Kangjun Dong, Chenge Shi, Al-Ahsab Hassan Thabet Mohammed, Lixin Guo, Xiang Yi, Ping Wang, Juan Li   +7 more
doaj   +1 more source