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Atmospheric and Oceanic Optics

2020 year, number 8

The analysis of intensity correlation in laser transceiving systems for keying

V.P. Aksenov1, V.V. Dudorov1, V.V. Kolosov1,2, Ch.E. Pogutsa1, M.E. Levitskii3
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
2Tomskiy Nauchnyy Tsentr SO RAN, Tomsk, Russia
3Innovation Research Association "TOPAS", Tomsk, Russia
Keywords: лазерное излучение, конфиденциальная оптическая связь, криптография, атмосферная турбулентность, флуктуации интенсивности, теорема взаимности, laser radiation, confidential optical communication, cryptography, atmospheric turbulence, intensity fluctuations, reciprocity theorem


The potentials for and limitations to the use of intensity fluctuations of laser beams propagating through a turbulent atmosphere for generating random data when keying in confidential optical communication systems are analyzed. The technique is based on the reciprocity theorem for optical fields. Light propagation in a system of two transceivers directed at each other, the signals from which are distorted by an atmospheric channel, is numerically simulated. An experimental setup is created; the generation of random correlated signals in such a system is experimentally studied. A need for low-pass filtering of signals received is experimentally ascertained. The efficiency of this filtration is estimated. The dependences of the correlation coefficient on the geometrical parameters of the system and turbulent conditions along the propagation path are derived from the numerical simulation in a wide range of distances, aperture radii, and values of turbulence intensity. Theoretical results are shown to be in a good agreement with the results of laboratory experiments.