Study of turbulence effects for a free-space optical link over water

Details Study of turbulence effects for a free-space optical link over water Study of turbulence effects for a free-space optical link over water

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010spie.7828e...7m&link_type=abstract

Optics in Atmospheric Propagation and Adaptive Systems XIII. Edited by Stein, Karin; Gonglewski, John D. Proceedings of the S

Physics

Optics

Scientific paper

In this paper we report on measurements of atmospheric turbulence effects arising from water air interaction. The aim of this study is to aid in the design of a free-space optical relay system to facilitate longer line-of-sight distances between relay buoys in a large expanse of water. Analysis of turbulence statistics will provide the basis for adaptive optics solutions to improve the relay signal strength affected by scintillation and beam wander. We report on experiments determining the isokinetic angle using an array of broadband incoherent sources of variable angular separation on the order of 0.1 mrad to 2.8 mrad. The experimental setup consists of a 5 inch telescope with high speed CMOS camera observing over a distance of 300 m close at a height of 1.5 m above the water surface. As part of the turbulence characterisation we experimentally estimate the relative image motion of angle-ofarrival fluctuations and perform other time series analysis. Analysis of the image motion requires new techniques due to the extended nature of the source. We explore different centroiding algorithms and surface fitting techniques.

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