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4 May 2007 Minimization of acquisition time in a wavelength diversified FSO link between mobile platforms
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Free-space optical (FSO) communication links are envisioned as a viable option for the provision of temporary high-bandwidth communication links between moving platforms, such as a ground station and a mobile aerial platform such as an unmanned aerial vehicle. One of the limitations of FSO links is the transmission of laser beams through various weather phenomena. One technique to attempt to overcome the effects of weather, such as fog, is to implement a wavelength diversity scheme between the FSO transmitter and receiver. This paper investigates the minimization of link acquisition times using a wavelength diversity scheme between mobile FSO platforms. The wavelength diversity scheme consists of three different wavelengths, 1.55 μm, 0.85 μm and 10 μm. Each wavelength has different advantages and disadvantages for transmission depending of prevalent weather conditions and atmospheric turbulence conditions. A model of a ground-to-air FSO link is developed in order to predict the beam profile in the receiver plane. A simulation analysis of the transmission properties of the wavelength diversity schemes will be presented. Based on the transmission properties, a method for minimizing link acquisition times through the exploitation of various properties of each wavelength is presented and analyzed.
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Alan Harris and Tayeb A. Giuma "Minimization of acquisition time in a wavelength diversified FSO link between mobile platforms", Proc. SPIE 6551, Atmospheric Propagation IV, 655108 (4 May 2007);

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