Results 21 to 30 of about 118,557 (293)
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 +2 more
doaj +1 more source
Optical Turbulence Profile in Marine Environment with Artificial Neural Network Model
Remote Sensing, 2022 Optical turbulence strongly affects different types of optoelectronic and adaptive optics systems. Systematic direct measurements of optical turbulence profiles [Cn2(h)] are lacking for many climates and seasons, particularly in marine environments ...
Cuicui Bi +7 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
Analysis of the Optical Turbulence Model Using Meteorological Data
Remote Sensing, 2022 The model of atmosphere optical turbulence is important in the research field of laser atmospheric transmission, and plays a key role in astronomical site selection. In this paper, the single and overall statistical analysis between different outer scale
Manman Xu +3 more
doaj +1 more source
Vortex instability in turbulent free-space propagation [PDF]
, 2018 The spatial structuring of optical fields is integral within many next generation optical metrology and communication techniques. A verifiable physical model of the propagation of these optical fields in a turbulent environment is important for ...
Lavery, Martin P.J.
core +1 more source
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
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 +11 more
doaj +1 more source
Humidity's influence on visible region refractive index structure parameter $C_n^2$ [PDF]
, 2006 In the infrared and visible bandpass, optical propagation theory conventionally assumes that humidity does not contribute to the effects of atmospheric turbulence on optical beams. While this assumption may be reasonable for dry locations, we demonstrate
Andreas +14 more
core +2 more sources
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
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 +3 more
doaj +1 more source