Effect of Platform Vibration Characteristics and Atmospheric Turbulence Characteristics on Free-space Optical Communication Systems

To realize laser high-speed data transmission of multiple nodes in space information networks, a one-to-two space laser communication system was designed and carried out for outfield experiments. Based on the experimental results, the causes affecting the transmission BER of free-space optical (FSO) communication system are comprehensively analyzed from both the platform vibration characteristics and the atmospheric turbulence characteristics. According to the vibration characteristics of the airship platform, the effect of coarse and fine composite axis tracking technology on the BER of FSO communication system was studied. Based on the log-normal probability density function (PDF) of atmospheric turbulent light intensity scintillation, the relationship between the structure constant of atmospheric refractive index and the system BER was derive to quantitatively analyze the effect of atmospheric turbulence on space laser communication. The experimental results show that a communication BER of 9.45E-9 is achieved at a communication distance of 2km and a communication rate of 2.5Gbps in a weak turbulent channel. The research results play a positive role in promoting the development of FSO communication technology under atmospheric turbulent channels.