Atmospheric optical communications systems

Kerr, J. R.; Titterton, Paul J.; Kraemer, Anja; Cooke, C.R.

doi:10.1109/proc.1970.7990

Cited by 26 publications

(9 citation statements)

References 75 publications

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“…In the calculations we have used the model given in form [63,64] 3 7 ) where α = 1/3, z 0 = 3200 m, and C n 2 (0) = 4.2x10 -14 m -2/3 , z is the height in meters. As was shown experimentally, the outer turbulence scale can lead to decreasing of random displacements of beam centroid and image center-of-gravity of scattered wave.…”

Section: Numerical Resultsmentioning

confidence: 99%

Laser beam wander in the atmosphere: implications for optical turbulence vertical profile sensing with imaging LIDAR

Zilberman

Kopeika

2008

J. Appl. Remote Sens

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A summary of different approaches for laser beam wander statistics estimation is presented. The principles of an imaging LIDAR technique for remote measurements of refractive turbulence vertical profile based on image motion analysis of a secondary source created by a laser beam at a given altitude are described. The turbulence-induced beam displacement statistics and angle-of-arrival variance of backscattered wave-front are analyzed for different sensing configurations. This study has implications for airborne reconnaissance image restoration, optical satellite communication, adaptive optics, and atmospheric effects on laser weaponry.

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Section: Numerical Resultsmentioning

confidence: 99%

Laser beam wander in the atmosphere: implications for optical turbulence vertical profile sensing with imaging LIDAR

Zilberman

Kopeika

2008

J. Appl. Remote Sens

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“…Furthermore, these links require a much simpler infrastructure as compared to fiberbased systems. The majority of the proposed applications of free-space optical communications use polarization, wavelength, or the time degree of freedom of the optical fields for encoding information [1,2]. Recently, there have been a number of studies suggesting the use of spatial profile of optical fields as an extra degree of freedom for encoding information [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Free-space communication through turbulence: a comparison of plane-wave and orbital-angular-momentum encodings

Mirhosseini

Rodenburg

Malik

et al. 2013

Journal of Modern Optics

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Free-space communication allows one to use spatial mode encoding, which is susceptible to the effects of diffraction and turbulence. Here, we discuss the optimum communication modes of a system while taking such effects into account. We construct a free-space communication system that encodes information onto the planewave (PW) modes of light. We study the performance of this system in the presence of atmospheric turbulence, and compare it with previous results for a system employing orbital-angular-momentum (OAM) encoding. We are able to show that the PW basis is the preferred basis set for communication through atmospheric turbulence for a large Fresnel number system. This study has important implications for high-dimensional quantum key distribution systems.

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“…Intensity modulation, on-off keying (OOK) and pulse position modulation (PPM) are widely used modulation schemes. If modulated light is emitted through an atmospheric channel, then various adverse influences of atmospheric turbulence, molecular constituents and aerosols will occur 8,9 . Turbulence induces random fluctuations in the atmosphere's temperature and pressure, resulting in random irregularities.…”

Section: Introduction To Wireless Optical Communicationsmentioning

confidence: 99%

Experimental performance evaluation of non-line-of-sight ultraviolet communication systems

Chen

Abou-Galala

et al. 2007

SPIE Proceedings

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Motivated by rapid advances in solar blind ultraviolet (UV) light emitting diodes (LEDs), filters and photomultiplier tubes (PMTs), together with unique UV atmospheric propagation characteristics, a non-line-of-sight (NLOS) UV communication test-bed has been recently built and utilized for extensive experimental evaluation of performance of NLOS UV links in outdoor environments. Towards this end, key link components are first characterized and their limitations are identified. The tradeoffs among communication range, received number of photons, and bit-error-rate are revealed via field measurement results. Wavelength diversity is achieved by utilizing combinations of sources and detectors centered at different wavelengths in the solar blind band. It is demonstrated that signals can be reliably transmitted to their destinations of dozens of meters away through an NLOS channel. Although all reported results in this paper are based on open field experiments, it is found that reflections from surrounding objects such as trees and buildings can enhance the received signal strength, up to an order of magnitude increase in the received number of photons in some cases, thus significantly improving link performance.

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Atmospheric optical communications systems

Cited by 26 publications

References 75 publications

Laser beam wander in the atmosphere: implications for optical turbulence vertical profile sensing with imaging LIDAR

Laser beam wander in the atmosphere: implications for optical turbulence vertical profile sensing with imaging LIDAR

Free-space communication through turbulence: a comparison of plane-wave and orbital-angular-momentum encodings

Experimental performance evaluation of non-line-of-sight ultraviolet communication systems

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