Results 11 to 20 of about 21,556 (239)
Are FRB Wandering Narrow Beams? [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2016 It is generally assumed that the sources of Fast Radio Bursts radiate roughly isotropically, so that the observed low duty cycle of any individual source indicates a similar low duty cycle of its radio-frequency emission. An alternative hypothesis is that the radiative duty cycle is ${\cal O}(1)$, but that the radiation is emitted in a beam with a ...
openaire +3 more sources
A Survey of Structure of Atmospheric Turbulence in Atmosphere and Related Turbulent Effects
Atmosphere, 2021 The Earth’s atmosphere is the living environment in which we live and cannot escape. Atmospheric turbulence is a typical random inhomogeneous medium, which causes random fluctuations of both the amplitude and phase of optical wave propagating through it.
Fazhi Wang +4 more
doaj +1 more source
Results in Physics, 2019 By analyzing the construction features of a Lommel Gaussian-Schell beam and the beam wander for Gaussian beams, we derive the closed-from approximations expression for the wander of Lommel Gaussian-Schell beam through unstable stratification and weak ...
Qiyong Liang, Yun Zhu, Yixin Zhang
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Quantifying the Effect of Atmospherically-Induced Pointing Errors in Optical Geostationary Satellite Feeder Links Using Transmitter Diversity [PDF]
, 2017 Optical links to geostationary (GEO) satellites suffer from atmospherically-induced beam wander which leads to pointing errors at the satellite causing deep fades.
Giggenbach, Dirk +3 more
core +1 more source
天地一体化信息网络, 2021 The eff ect of beam center shift on the performance of satellite chaos laser safety communication system in spaceintegrated-ground information network was studied, the bit error rate (BER) formulae with external and internal mismatch caused by beam ...
Mi LI +5 more
doaj +2 more sources
IEEE Photonics Journal, 2018 The effects of asymmetry atmospheric eddies on the beam spreading and wander of Bessel–Gaussian (BG) beams in anisotropic turbulence are studied. Results show that turbulence anisotropy leads to the declines in both beam spreading and wander of BG
Mingjian Cheng +5 more
doaj +1 more source
Non-Diffracting Light Wave: Fundamentals and Biomedical Applications
Frontiers in Physics, 2021 The light propagation in the medium normally experiences diffraction, dispersion, and scattering. Studying the light propagation is a century-old problem as the photons may attenuate and wander.
Yu-Xuan Ren +4 more
doaj +1 more source
Gaussian Entanglement Distribution via Satellite [PDF]
, 2015 In this work we analyse three quantum communication schemes for the generation of Gaussian entanglement between two ground stations. Communication occurs via a satellite over two independent atmospheric fading channels dominated by turbulence-induced ...
Hosseinidehaj, Nedasadat +1 more
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Towards correcting atmospheric beam wander via pump beam control in a down conversion process [PDF]
, 2016 Correlated photon pairs produced by a spontaneous parametric down conversion (SPDC) process can be used for secure quantum communication over long distances including free space transmission over a link through turbulent atmosphere.
Jennewein, Thomas +4 more
core +2 more sources
Photonics, 2023 Satellite laser communication can achieve high-speed, high-precision, and high-security broadband communication without being constrained by the electromagnetic spectrum, which has attracted attention.
Xuewen Jiang, Yi Wang, Wangyue Lu
doaj +1 more source