Liu Chao, Chen Shanqiu, Li XinYang, Xian Hao
Opt Express. 2014 Jun 30;22(13):15554-63. doi: 10.1364/OE.22.015554.
With extremely high sensitivity, the coherent laser communications has a large potential to be used in the long-range and high data-rate free space communication links. However, for the atmospheric turbulent links, the most significant factor that limits the performance of the coherent laser communications is the effect of atmospheric turbulence. In this paper, we try to integrate the adaptive optics (AO) to the coherent laser communications and analyze the performances. It is shown that, when the atmospheric turbulence condition D/r0 is not larger than 1, can the coherent laser communication system works well without the correction of an AO system. When it is in the gentle turbulent condition (around D/r0 = 2), only the tip and tilt correction can improve the mixing efficiency and the bit-error rate (BER) significantly. In the moderate (around D/r0 = 10) or relatively strong (around D/r0 = 17) turbulent condition, the AO system has to correct about 9 or 35 turbulent modes or more respectively to achieve a favorable performance. In conclusion, we have demonstrated that the AO technique has great potential to improve the performances of the atmospheric coherent laser communications.
相干激光通信具有极高的灵敏度，在远程和高数据速率的自由空间通信链路中具有很大的应用潜力。然而，对于大气湍流链路，限制相干激光通信性能的最重要因素是大气湍流的影响。在本文中，我们尝试将自适应光学（AO）集成到相干激光通信中并分析其性能。结果表明，当大气湍流条件D/r0不大于1时，相干激光通信系统在没有AO系统校正的情况下也能良好工作。当处于轻度湍流条件（约D/r0 = 2）时，仅进行倾斜校正就能显著提高混频效率和误码率（BER）。在中度（约D/r0 = 10）或相对较强（约D/r0 = 17）的湍流条件下，AO系统必须分别校正约9个或35个以上的湍流模式才能获得良好的性能。总之，我们已经证明AO技术在改善大气相干激光通信性能方面具有巨大潜力。
