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相干激光通信系统中,光学系统的偏振像差会改变信号光的偏振态,降低信号光与本振光的混频效率。为了定量分析和研究光学系统的偏振特性,提出了三维偏振光线追迹算法。针对大口径相干激光通信检测平台系统,利用该算法对平台的通信系统进行偏振光线追迹,并根据追迹计算所得的偏振变换矩阵,分析了偏振像差对圆偏振信号光偏振态的影响。通过搭建实验平台,验证了平台通信系统的偏振特性。
In a coherent laser communication system, the polarization aberration of the optical system changes the polarization state of the signal light and reduces the mixing efficiency of the signal light and the local light. In order to quantitatively analyze and study the polarization characteristics of the optical system, a three-dimensional polarization ray tracing algorithm is proposed. Aimed at large aperture coherent laser communication detection platform system, this algorithm is used to track the polarization of the communication system of the platform, and the influence of polarization aberration on the polarization state of circularly polarized signal light is analyzed based on the polarization transformation matrix calculated by the trace. By building an experimental platform, the polarization characteristics of the platform communication system are verified.