Analysis of Effect of Atmospheric Turbulence on Laser Communication System
大气湍流对激光通信系统的影响分析

Atmospheric turbulance is one of the main factors which have influence on the performance of a laser communication system. When other noises in a laser communication system are ignored and only the bit error rate (BER) resulted from the atmospheric turbulance is considered, the relation among BER, signal-to-noise ratio (SNR) and log-amplitude variance of a laser communication system when its laser beam is propagating in a slant atmospheric turbulence path is studied. According to the ITU-R turbulance structure constant model, the SNR and BER varied with the altitude at different wavelengths and different zenith angles are simulated numerically with FORTRAN. The result shows that for the same altitude, if the long wavelength laser beam is propagating slantly at a small zenith angle, the BER of the laser communication system can be reduced, the SNR can be increased and the communication quality can be improved.