6 March 2014 Improving the efficiency of undersea laser communications
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A preliminary evaluation of under-water data-rates achievable assuming near Poisson channel capacity achieving codes with pulse-position modulation and photon counting shows that to achieve 10’s to 100’s bits per second at a distance of 1 km requires 1-2m diameter collection areas with conventional blue laser transmitters and photomultiplier tubes. At distance of 200 m the data-rates increase to 6 Mb/s. A simple model is presented to show the rapid decrease in irradiance as a function of range in different types of deep-sea water where additive background noise can be neglected.
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H. Hemmati, H. Hemmati, A. Biswas, A. Biswas, "Improving the efficiency of undersea laser communications", Proc. SPIE 8971, Free-Space Laser Communication and Atmospheric Propagation XXVI, 89710I (6 March 2014); doi: 10.1117/12.2042254; https://doi.org/10.1117/12.2042254

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