Results 21 to 30 of about 2,420,038 (307)

A Multi-Model Ensemble Pattern Method to Estimate the Refractive Index Structure Parameter Profile and Integrated Astronomical Parameters in the Atmosphere

Remote Sensing, 2023
In this study, we devised a constraint method, called multi-model ensemble pattern (MEP), to estimate the refractive index structure parameter (Cn2) profiles based on observational data and multiple existing models.
Hanjiu Zhang, Liming Zhu, Gang Sun, Kun Zhang, Ying Liu, Xuebin Ma, Haojia Zhang, Qing Liu, Shengcheng Cui, Tao Luo, Xuebin Li, Ningquan Weng   +11 more
doaj   +1 more source

Wavelength-diversity transmission for fading mitigation in the atmospheric optical communication channel [PDF]

, 2006
Mitigation of index of refraction turbulence (IRT) effects is crucial in long-range atmospheric communication links. Diversity-transmission is one favorable way for fading compensation.
Perlot, Nicolas, Hennes Henniger, Giggenbach, Dirk, Nicolas Perlot, Brandon L. Wilkerson, Henniger, Hennes, Wilkerson, Brandon, Dirk Giggenbach   +7 more
core   +1 more source

Coherent polarization shift keying modulated free space optical links over a Gamma-Gamma turbulence channel [PDF]

, 2011
Problem statement: The optical signal propagating through the Free Space Optical (FSO) channel suffers from irradiance and phase fluctuations caused by the atmospheric turbulence, which results in Bit Error Rate (BER) performance degradation ...
Ghassemlooy, Zabih, Popoola, Wasiu Oyewole, Popoola, Wasiu O., Tang, Xuan, Rajbhandari, Sujan, Lee, Chung Ghiu, Ghassemlooy , Zabih, Lee , Chung Ghiu   +7 more
core   +1 more source

Optical turbulence in fiber lasers [PDF]

Optics Letters, 2014
We analyze the nonlinear stage of modulation instability in passively mode-locked fiber lasers leading to chaotic or noise-like emission. We present the phase-transition diagram among different regimes of chaotic emission in terms of the key cavity parameters: amplitude or phase turbulence, and spatio-temporal intermittency.
openaire   +4 more sources

Study of the ${\mathit{C}}_{\mathit{n}}^{\mathbf{2}}$ Model through the New Dimensionless Temperature Structure Function near the Sea Surface in the South China Sea

Remote Sensing, 2023
The refractive index structure constant Cn2 near the ocean surface is an important parameter for studying atmospheric optical turbulence over the ocean.
Feifei Wang, Kun Zhang, Gang Sun, Qing Liu, Xuebin Li, Tao Luo   +5 more
doaj   +1 more source

Coherent optical binary polarisation shift keying heterodyne system in the free-space optical turbulence channel [PDF]

, 2011
In this paper, analytical and simulation results for the bit error rate (BER) performance and fading penalty of a coherent optical binary polarization shift keying (2PolSK) heterodyne system adopted for a free space optical (FSO) communication link ...
Z. Ghassemlooy, Tang, Xuan, S. Rajbhandari, Lee , Chung Ghiu, Ghassemlooy, Zabih, Popoola, Wasiu Oyewole, W.O. Popoola, C.G. Lee, Popoola, Wasiu O., Rajbhandari, Sujan, Lee, Chung Ghiu, X. Tang, Ghassemlooy , Zabih   +12 more
core   +1 more source

Measurements and Modeling of Optical Turbulence in the Coastal Environment

Applied Sciences, 2022
The goal of this study was to characterize optical turbulence in the near-coastal environment. Measurements to obtain the refractive index structure parameter and other meteorological data were taken over the course of a month along the shore of Monterey
Sasha Barnett, Joseph Blau, Paul Frederickson, Keith Cohn   +3 more
doaj   +1 more source

BPSK subcarrier intensity modulated free-space optical communications in atmospheric turbulence [PDF]

, 2009
Free-space optical communications (FSO) propagated over a clear atmosphere suffers from irradiance fluctuation caused by small but random atmospheric temperature fluctuations.
Ghassemlooy, Zabih, Popoola, Wasiu Oyewole, Popoola, Wasiu O., Ghassemlooy , Zabih   +3 more
core   +1 more source

Method of Estimation of Turbulence Integral Parameters

Applied Sciences, 2021
The optical effects of turbulence are directly related to turbulence integral parameters, which are integrals of the refractive index structure constant over a whole path with different path-weighting functions (PWFs).
Hong Shen, Longkun Yu, Xu Jing, Fengfu Tan   +3 more
doaj   +1 more source

Performance of BPSK subcarrier intensity modulation free-space optical communications using a log-normal atmospheric turbulence model [PDF]

, 2010
In this paper, we present simulation results for the bit error rate (BER) performance and the fading penalty of a BPSK - subcarrier intensity modulation (BPSK-SIM) free-space optical (FSO) communication link in a log-normal atmospheric turbulence model ...
S. S. Muhammad, Z. Ghassemlooy, E. Leitgeb, Tang, Xuan, Muhammad, Sajid Sheikh, S. Rajbhandari, Ghassemlooy, Zabih, Popoola, Wasiu Oyewole, W. O. Popoola, Kandus, Gorazd, Leitgeb, Erich, Rajbhandari, Sujan, X. Tang, G. Kandus   +13 more
core   +1 more source