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针对潜望式激光通信终端中的运动反射镜会改变接收信号光偏振态从而导致系统混频效率下降的问题,提出一种基于旋转组合波片的偏振态实时补偿方法,使接收信号光偏振态恒定为45°线偏振,以实现与本振光的高效混频。在建立潜望式扫描机构几何模型的基础上,利用三维偏振态追迹算法对其偏振态传输特性进行分析,得到系统偏振态传输矩阵,给出不同方位角、俯仰角下出射信号光的偏振态,建立了偏振态补偿元件1/4波片、1/2波片各自旋转角度与潜望式扫描机构方位角、俯仰角的联系,分析了波片旋转角度误差对出射信号光偏振态的影响。
In view of the problem that the moving mirror in the perispheric laser communication terminal changes the polarization state of the received signal light and leads to the decrease of the system mixing efficiency, a real-time polarization state compensation method based on the rotating composite wave plate is proposed. The polarization state of the received signal light Constantly 45 ° linearly polarized to achieve efficient mixing with local light. Based on the geometric model of the periscope scanning mechanism, the transmission characteristics of the polarization state are analyzed by using the three-dimensional polarization tracking algorithm, and the polarization state transfer matrix of the system is obtained. The polarization of the outgoing signal light at different azimuths and pitches is given The relationship between the rotation angles of the 1/4 wave plate and the 1/2 wave plate of the polarization compensation element and the azimuth angle and the pitch angle of the perispectal scanning mechanism is established. The influence of the rotation angle error of the wave plate on the polarization state of the output signal light influences.