Simulation And Analysis On Fiber Coupling Of Space Optical Communications On The Atmospheric Turbulence Conditions

With the development of the optical communication technology,the fiber coupling technology is more and more attended in the future.The1550nm band space optical communication system has many advantages,including high transmitting power,large communication capacity,high transfer rate,large laser diffraction angle,and the receiver of the optical fiber use the fiber amplifier,so it can improve the transmission power and the receviving sensitity.Due to the sophisticated optical fiber communication technology introduced to the space communication,the1550nm band optical communication between satellite and ground has a broad development prospects on the high speed satellite communication in the future.This paper study in-depth of the satellite and ground optical communication system using fiber-coupled technology,and establish the space laser to single-mode fiber coupling model.This paper also analysis the optical fiber positioning error,pointing error,atmospheric turbulence,and other factors on the spatial light coupled to single-model fiber.Through turbulence wavefront simulated,it study the intensity fluctuation,the phase fluctuation,angle of arrival up and down,beam drift and expansion.This paper also lists five kinds of atmospheric refractive index model,the refractive index of the power spectral density function up and down,in the end,gain the concrete structure function.Finally,this paper simulate a beam wavefront with Zernike polynomial,and use the virtuallab to simulate the optical fiber coupling system affected by atmospheric turbulence.