Based on Kolmogorov and Rytov's theory model and considering the effect of turbulence intensity on the performance of free space laser communication,a modified theory model used to depict the bit error rate(BER) in beth weak and medium turbulence conditions is obtained, the influence of turbulent intensity and wavelength on BER in communication system is also simulated. It is shown that in medium turbulence field, the influence of BER is very obvious compared with weak turbulence. The system BER increases rapidly with the increase of the propagation distanee and trends to saturation. With system's BER below 10 -9 ,the effective communication range in the weak atmosphere turbulence will be greater than that in the medium turbulence regime. Under a certain intensity of turbulence the longer the wavelength is adopted, the better the system performance is. The analytical results can be used to improve the performance of laser communication system.%基于Kolmogorov和Rytov的大气湍流理论模型,考虑到大气湍流引起的强度闪烁对激光通信系统性能的影响,得到了用于描述强、弱湍流条件下误码率的理论模型,数值模拟了湍流强弱和激光波长对通信系统误码率的影响.结果表明:中强湍流区对信噪比的影响明显大于弱湍流区,随着传输距离的增加,系统的误码率迅速增大并最终趋于饱和;当系统误码率低于10<'-9>时,弱湍流区的有效通信距离远大于中强湍流区.同时,当湍流强度一定时,激光的波长越长对改善系误码率越有利,对工程上提高激光通信的质量具有一定的参考价值.
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