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Reduction of atmospheric turbulence using optical duplicate system in free-space optical communications
Optical Review  (IF0.89),  Pub Date : 2021-07-07, DOI: 10.1007/s10043-021-00677-1
Tomoko Nakayama, Yoshihisa Takayama, Chiemi Fujikawa, Kashiko Kodate

To reduce the effect of atmospheric turbulence and stabilize the optical link in free-space optical (FSO) communications, we have proposed to use an optical duplicate system (ODS) as a multi-beam generator. In this paper, a transmitter adopting the ODS is designed and constructed for the experiment. Moreover, the experiment is conducted to transmit multi-beam generated by the ODS between two points on the ground at a distance of about 450 m. In this experiment, it is found that when the number of multi-beam generated by the ODS is increased from one to two, the width of the probability density distribution of the light intensity calculated from the movies captured by the receiver becomes narrower, and the variation of the light intensity becomes smaller. It is experimentally demonstrated that the effect of atmospheric turbulence can be reduced by the ODS. These results indicate that the ODS will make a significant contribution to the stabilization of optical link in FSO communications.