1 September 2006 3.5-micron free-space laser communications
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Free-space laser communication has been demonstrated with application potential in many areas such as line-of-sight communications, satellite communications and the last mile solution in a fiber optics networking. Both 0.8 and 1.5 micron wavelengths are currently used in state-of-the-art free space laser communication systems; unfortunately the system performance is imposed by atmospheric turbulence. To reduce the atmospheric effect in free-space laser communication systems, several techniques have been used, such as adaptive optics, aperture averaging and multiple transmitters; however, significant improvement has not been achieved. Theoretically, the seeing effect may be released using a longer wavelength. In this paper, we present a 3.5 micron free-space laser communication system model and its system performance evaluation. A 3.5 micron propagation model based on MODTRAN simulation results in different weather patterns is presented first, and a propagation link budget system model is described after that. The propagation channel performance evaluation results are presented by means of bit error rate versus various propagation distances.
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Allen Geiger, Allen Geiger, Chueh Ting, Chueh Ting, Edward J. Burlbaw, Edward J. Burlbaw, Jianwu Ding, Jianwu Ding, Shinn-Der Sheu, Shinn-Der Sheu, } "3.5-micron free-space laser communications", Proc. SPIE 6304, Free-Space Laser Communications VI, 63041L (1 September 2006); doi: 10.1117/12.682557; https://doi.org/10.1117/12.682557

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