Experimental Study on Beam Wander Under Varying Atmospheric Turbulence Conditions

Kaushal, Hemani; Kumar, Vivek; Dutta, Amit; Aennam, Harika; Jain, Virander Kumar; Kar, Subrat; Joseph, Joby

doi:10.1109/lpt.2011.2166113

Cited by 69 publications

(30 citation statements)

References 6 publications

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“…When the , the SNR that we need about are 17.5dB, 18.7dB, 21.8dB, 28.6dB respectively. That means if we want decrease the SNR, effective measure should be taken to compensate the power of the signal when transmit under the turbulence channel [16]. From the simulation results, the conclusion that BPSK has a better performance under the weak turbulent can be derived.…”

Section: Table1 Simulation Parametersmentioning

confidence: 96%

Performance Analysis of Different Modulation Techniques for Free-Space Optical Communication System

Zhang

Xiao

et al. 2015

TELKOMNIKA

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Section: Table1 Simulation Parametersmentioning

confidence: 96%

Performance Analysis of Different Modulation Techniques for Free-Space Optical Communication System

Zhang

Xiao

et al. 2015

TELKOMNIKA

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“…In this experiment, clear and bright interferograms were very important as they provided maximum visibility of intensity perturbations resulting from the introduced thermal turbulence. It has been experimentally shown that a laser beam propagating through turbulence su ers wandering [28], spreading [29], scintillation [30] and many other behaviors. Beam wandering is de ned as the change of direction of the propagating beam that results from the introUnauthenticated Download Date | 5/12/18 7:09 PM duction of turbulence.…”

Section: Introductionmentioning

confidence: 99%

Experimental determination of thermal turbulence effects on a propagating laser beam

Ndlovu

Chetty

2015

Open Physics

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Abstract:The e ect of turbulence on propagating laser beams has been a subject of interest since the evolution of lasers back in 1959. In this work, an inexpensive and reliable technique for producing interferograms using a point di raction interferometer (PDI) was considered to experimentally study the turbulence e ects on a laser beam propagating through air. The formed interferograms from a propagating beam were observed and digitally processed to study the strength of atmospheric turbulence. This technique was found to be sensitive enough to detect changes in applied temperature with distance between the simulated turbulence and laser path. These preliminary ndings indicated that we can use a PDI method to detect and localise atmospheric turbulence parameters. Such parameters are very important for use in the military (defence laser weapons) and this is vital for South Africa (SA) since it has natural resources, is involved in peace keeping and mediation for other countries, and hence must have a strong defence system that will be able to locate, detect and destroy incoming missiles and other threatening atmospheric systems in order to protect its environment and avoid the initiation of countermeasures on its land.

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“…Hot and cool air currents due to the cooling fans within the server produce temperature gradients that lead to scintillation in the beam spot at the receiver [11] . Turbulence also leads to the beam wander phenomenon that affects the irradiance profile of the received signal [12,13] . Nevertheless, FSOIs between server components are considered to offer a competitive solution for the next generation of servers due to the low index of refraction of air, which is lower than that of any waveguide, the straightforward and short distance three-dimensional (3D) arrangement capabilities, and the wide optical bandwidth facilitating high data rates with low achievable bit error rates (BERs).…”

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confidence: 99%

“…7 and 8). Rigorous theoretical analysis [12,13,19] cannot be exploited to predict the experimental results due to the experimental environmental conditions that are highly uncommon when compared to common air turbulence conditions [4] .…”

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confidence: 99%

Air turbulence effects on performance of optical wireless communication with crosstalk in server backplane

2017

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Free space optical interconnections (FSOIs) are anticipated to become a prevalent technology for short-range high-speed communication. FSOIs use lasers in board-to-board and rack-to-rack communication to achieve improved performance in next generation servers and are expected to help meet the growing demand for massive amounts of inter-card data communication. An array of transmitters and receivers arranged to create an optical bus for inter-card and card-to-backplane communication could be the solution. However, both chip heating and cooling fans produce temperature gradients and hot air flow that results in air turbulence inside the server, which induces signal fading and, hence, influences the communication performance. In addition, the proximity between neighboring transmitters and receivers in the array leads to crosstalk in the received signal, which further contributes to signal degradation. In this Letter, the primary objective is to experimentally examine the off-axis crosstalk between links in the presence of turbulence inside a server chassis. The effects of geometrical and inter-chassis turbulence characteristics are investigated and first-and second-order statistics are derived.

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Experimental Study on Beam Wander Under Varying Atmospheric Turbulence Conditions

Cited by 69 publications

References 6 publications

Performance Analysis of Different Modulation Techniques for Free-Space Optical Communication System

Performance Analysis of Different Modulation Techniques for Free-Space Optical Communication System

Experimental determination of thermal turbulence effects on a propagating laser beam

Air turbulence effects on performance of optical wireless communication with crosstalk in server backplane

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