Optical Wave Propagation and Communication in Turbulent Media

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About this Research Topic

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Background

Optical waves are known to be degraded when they propagate in turbulent land atmosphere, marine atmosphere, ocean and tissue. Degradation in the optical wave causes changes in various received beam characteristics, which in turn results in the loss of intended performance level of the systems used in such turbulent media. Within this concept, beam spreading, beam wander, intensity fluctuations, pointing error, signal-to-noise ratio and bit-error rate performance of optical wireless communication, laser radar, imaging and similar systems used in the presence of atmospheric, marine, oceanic and tissue turbulence are being investigated.
To compensate and mitigate the degradation, and thus to improve the system performance, various techniques involving the use of aperture averaging, partially coherent source, different optical beam profiles and adaptive optics are investigated. The nature of turbulence phenomena in land atmosphere, marine atmosphere, ocean and tissue, in terms of the power spectrum, provides information on how much kinetic energy is contained in the turbulent eddies versus the spatial frequency.
Various power spectrum models valid in different media are proposed and there are still investigations to extend spectra to cover detailed physical conditions. Statistics of turbulence in weak, moderate and strong turbulence regimes and the applications of the statistics in formulating optical wave parameters are also being examined. Basic formulations are studied to cover correlations of the amplitudes, phases of the fields and additionally the correlations of the field intensities. Experimental works on the turbulence phenomena itself, the effects of turbulence on the optical wave propagation and the systems performances are indispensable part of the research in this area. In the turbulence evaluations, system configurations such as horizontal, vertical and slant paths also play important roles.
In this Research Topic all the above mentioned topics will be covered. Other original theoretical and experimental contributions that will display new turbulence features and effects on the optical beams are also welcome.

Keywords: Wave propagation, Turbulence theory, Optical Wireless Communication

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