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

Ruth Mackey; Mingzhou Chen; Andrew Lambert; David Mackey; Alexander Goncharov

doi:10.1117/12.864689

11 October 2010 Study of turbulence effects for a free-space optical link over water

Ruth Mackey, Mingzhou Chen, Andrew Lambert, David Mackey, Alexander Goncharov

Proceedings Volume 7828, Optics in Atmospheric Propagation and Adaptive Systems XIII; 782808 (2010) https://doi.org/10.1117/12.864689
Event: SPIE Remote Sensing, 2010, Toulouse, France

Abstract

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.

Citation Download Citation

Ruth Mackey, Mingzhou Chen, Andrew Lambert, David Mackey, and Alexander Goncharov "Study of turbulence effects for a free-space optical link over water", Proc. SPIE 7828, Optics in Atmospheric Propagation and Adaptive Systems XIII, 782808 (11 October 2010); https://doi.org/10.1117/12.864689

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KEYWORDS

Turbulence

Light emitting diodes

Point spread functions

Image analysis

Ocean optics

Relays

Free space optics

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