Results 21 to 30 of about 11,205 (213)

Alamouti-Type STBC for Atmospheric Optical Communication Using Coherent Detection

IEEE Photonics Journal, 2014
Alamouti-type space-time block coding is studied for optical wireless communication systems using coherent detection over atmospheric turbulence channels.
Mingbo Niu, Julian Cheng, Jonathan F. Holzman   +2 more
doaj   +1 more source

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

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

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

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

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

Standard Deviation of Fiber-Coupling Efficiency for Free-Space Optical Communication Through Atmospheric Turbulence

IEEE Photonics Journal, 2023
In fiber-based optical receivers such as coherent receiver, the optical signal reaching the receiver's aperture is coupled to the optical fiber through a set of lenses.
Woohyeon Moon, Hoon Kim
doaj   +1 more source

Optical Communication Through Random Atmospheric Turbulence [PDF]

Applied Optics, 1969
In this paper we coipare the theoretical performances of two schemes of optical communication through the atmospheric turbulence: (1) heterodyne detection and (2) video detection. The signal-to-noise ratios (S/N) in the output current of a detector are expressed for both schemes in terms of the correlation function of the refractive index fluctuations ...
Laussade, Jean-Pierre, Yariv, Amnon, Comly, Jack   +2 more
openaire   +3 more sources

32 Gbps QPSK Optical Communication Technology Based on a New Equalizer in Atmospheric Turbulence

IEEE Access, 2021
In this paper, cascaded least mean square-least mean square (LMS-LMS) adaptive equalization scheme is proposed based on fiber coupling system, in order to improve the transmission performance of quadrature phase shift keying (QPSK) modulated optical ...
Binyu Li, Haifeng Yao, Lei Zhang, Shoufeng Tong   +3 more
doaj   +1 more source

Recovery Capabilities of Rateless Codes on Simulated Turbulent Terrestrial Free Space Optics Channel Model

International Journal of Antennas and Propagation, 2013
Free Space Optics (FSO) links are affected by several impairments: optical turbulence, scattering, absorption, and pointing. In particular, atmospheric optical turbulence generates optical power fluctuations at the receiver that can degrade ...
A. Andò, S. Mangione, L. Curcio, S. Stivala, G. Garbo, R. Pernice, A. C. Busacca   +6 more
doaj   +1 more source