光学学报, 2016, 36 (11): 1106008, 网络出版: 2016-11-08
基于退偏振比探测的大气激光通信
Atmospheric Laser Communication Based on Depolarization Ratio Detection
光纤光学 大气激光通信 多径效应 码间串扰 退偏振比 fiber optics atmospheric laser communication multipath effect intersymbol interference depolarization ratio
摘要
针对大气激光通信中多径散射效应产生的通信链路码间串扰问题,提出了一种基于退偏振比探测的大气激光通信传输方案。利用光子追迹和Stokes矢量变换进行了Monte Carlo仿真;通过设置不同的云层物理厚度和消光系数,得到接收光退偏振比与云层光学厚度的一一对应关系;基于Stotts公式,得到接收光退偏振比与平均脉冲时间展宽的对应关系。提出了在多径效应影响下的最佳通信传输速率方案,该方案在激光通信系统接收端直接进行退偏振比探测,可有效评估大气信道环境的多径强度,进而在保证激光通信传输质量的同时实现最大的通信传输速率。该研究在星地激光通信以及自适应激光通信的通信链路优化领域具有理论指导意义和应用价值。
Abstract
A transmission scheme of atmospheric laser communication based on depolarization ratio detection is proposed to solve the problem that the intersymbol interference in the communication link is caused by the multipath scattering effect in atmospheric laser communication. A Monte Carlo simulation is carried out by using the technologies of photon tracing and Stokes vector transform. The correspondence relationship between the depolarization ratio of received light and the optical depth of clouds is obtained through setting different physical depths and extinction coefficients of clouds. The relationship between the depolarization ratio of received light and the average pulse broadening time is obtained based on the Stotts formula. An optimal communication rate scheme under the multipath effect is proposed. This scheme can detect the depolarization ratio at the receiver of the laser communication system directly, evaluate the multipath intensity in atmospheric channel environment effectively, and achieve the largest communication transmission while ensuring the quality of laser communication. The research has theoretical guiding significance and application value in communication link optimization of satellite-ground laser communication and adaptive laser communication.
张岱, 郝士琦, 赵青松, 孙韩. 基于退偏振比探测的大气激光通信[J]. 光学学报, 2016, 36(11): 1106008. Zhang Dai, Hao Shiqi, Zhao Qingsong, Sun Han. Atmospheric Laser Communication Based on Depolarization Ratio Detection[J]. Acta Optica Sinica, 2016, 36(11): 1106008.