摘要
对于星地激光通信,使用圆偏振光进行传输是其较优的选择,此时必须对其光学系统进行偏振定标。利用菲涅耳公式及琼斯矩阵对影响光学系统偏振态的因素进行了分析。针对一个特定的星地激光通信发射光学系统,给出了系统结构以及存在于系统中的几种不同分光膜系的曲线。利用光学软件ZEMAX,对初始状态为线偏振的激光在光学系统中传播过程的每一步进行偏振特性分析。分析结果表明:对于空间光通信光学系统,45°放置的分光片和反射镜是导致偏振态改变的主要因素;一般意义上的消偏振膜系只能保证p分量和s分量的能量透射率相同,但p光和s光之间仍存在相位延迟,造成偏振态变化;调整入射光的光矢量方向至与入射面平行或垂直,可将光学系统引起的仪器偏振误差降至最低。
To the satellite-to-ground（STG） optical communication, the circular polarization laser is an optimum choice for the information transmission. Firstly, the influence factors of the polarization characteristics of the optical system are analyzed by the Fresnel formula and the Jones Matrix. Then the structure of a practical STG laser communication transmitting optical system and the designed transmittance curves of several different bandpass filtering films in the system are given. Propagation of the linear polarization laser in the optical system is simulated by the optical software ZEMAX. The results indicate that the beam splitters and mirrors on a 45° tilt make the greatest contributions to the polarization state transform. Ordinary depolarization film can only prove that the power pcomponent and s-component transmittances are identical. But the phase delay of p-light and s-light still exist, which can make the polarization state change. By adjusting the direction of the incident light vector to the incident plane,the instrument polarization error induced by the optical system can be reduced to the minimum.
出处
《激光与光电子学进展》
CSCD
北大核心
2015年第12期66-71,共6页
Laser & Optoelectronics Progress
基金
国家自然科学基金重大计划培育项目(91338116)
关键词
光通信
星地激光通信
光学系统
偏振特性
波长分光片
optical communications
satellite-to-ground laser communication
optical system
polarization characteristic
wavelength beam splitter
