针对激光器线宽对空间相干光通信系统性能的影响,提出了激光器线宽影响空间相干光通信链路传输误码率的计算方法。研究了湍流大气中激光器线宽对链路传输误码率的影响,建立了大气湍流中空间相干光通信链路传输误码率模型。分析了不同参数影响下激光器线宽对误码率的影响,通过计算发现,线宽增大1倍,误码率增加2.7倍左右;线宽增大一个数量级,相应的误码率也增大近一个数量级。

We propose a calculation method of the bit error rate of space coherent optical communication link, to solve the influence of laser linewidth on the performance of space coherent optical communication system. The influence of the laser linewidth on the transmission error rate of the link in the turbulent atmosphere is studied, and the error rate model of the spatial coherent optical communication link in the atmospheric turbulence is established. The influence of different parameters on the bit error rate is analyzed, and the result of numerical settlement is given. It is found that, the linewidth increases by 1 times and the bit error rate increases by about 2.7 times; the linewidth increases by an order of magnitude and the corresponding bit error rate increases by nearly one order of magnitude.