偏振失配对空间相干光通信系统性能的影响

Influence of Polarization Mismatch on Space Coherent Communication System

摘要:

基于琼斯偏振理论,对通信系统光端机和大气传输信道进行了偏振建模,定量分析了传输过程中二者对信号光的偏振改变作用,并推导出信号光和本振光的偏振失配与混频效率之间的关系。在此基础上,利用偏振调控反馈算法和PCD-M02型压电陶瓷式偏振控制器(PCD),提出了一种自动反馈式偏振调控补偿装置,能够有效避免偏振失配现象的发生,保证了较高的混频效率,进而提高了空间相干光通信系统的整体性能。

Abstract:

Using Jones polarization theory, the polarization models of optical terminal and atmospheric transmission channel were carried out for a space coherent optical communication system, and their effect on transformation of the signal light was analyzed quantitatively. The relationship between the polarization mismatch of signal light and local oscillator light and the mixing efficiency was derived in this paper. In addition, using the polarization control algorithm and the PCDM02 type piezoelectric ceramic polarization control device (PCD), an automatic feedback polarization control compensation device was proposed, which can effectively avoid the polarization mismatch, thus ensuring a high frequency mixing efficiency and improving the overall performance of system.