Influence of Visibility on Availability of Free Space Optical Link

V. Kvicera, M. Grabner, and O. Fiser (Czech Republic)


Free space optics, propagation characteristics, visibility, and link availability


Results of a propagation study on a free space optical link at 850 nm on an 850 m long path over a one-year period are presented. Individual attenuation events were compared with the concurrent meteorological conditions and were classified according to the types of individual hydrometeors that occurred. The records of both the observed attenuation events and the concurrent meteorological situations were statistically processed. Cumulative distributions of attenuation due to individual hydrometeors as well as cumulative distributions of visibility were obtained for both each month and the whole year period. The real influence of individual hydrometeors on both attenuation of free space optical link and visibility was assessed. Cumulative distributions of attenuation due to fog were calculated from the measured cumulative distributions of visibility due to fog according to different formulas. The results obtained were compared with the measured cumulative distributions of attenuation due to fog. The relationship for the best fitted approximation to the measured data was proposed.

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