带有整形元件的相干探测混频系统  

Coherent Detection Mixing Systems with Shaping Elements

作　　者：戴正爽 江伦[2,3] 宋志化 代天君 于鑫 王超 宋延嵩[2] 佟首峰[2,3] Dai Zhengshuang;Jiang Lun;Song Zhihua;Dai Tianjun;Yu Xin;Wang Chao;Song Yansong;Tong Shoufeng(College of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun,Jilin 130022,China;National and Local Joint Engineenng Research Center of Space Optoelectronics Technology,ChangchunUniversityof Science and Technology,Changchun,Jilin 130022,China;Peng Cheng Laboratory,Shenzhen,Guangdong 518000,China)

机构地区：[1]长春理工大学光电工程学院,吉林长春130022 [2]长春理工大学空间光电技术国家地方联合工程研究中心,吉林长春130022 [3]鹏城实验室,广东深圳518000

出　　处：《激光与光电子学进展》2021年第7期124-130,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61701045,61805028,91838301);海洋立体通信网络验证示范平台项目(LZC0020)。

摘　　要：相干探测混频器是空间相干光通信系统的重要组件,主要作用是将信号光和本振光进行混频得到中频信号,进而对光信号进行放大,使探测器的灵敏度达到量子噪声极限。混频效率对中频信号的强度尤其重要,因此,假设本振光为理想高斯分布时,计算了信号光的不同振幅分布对混频效率的影响。通过设计一组光束整形镜将信号光的振幅分布变为高斯分布,从而实现高斯光和高斯光的相干混频。实验结果表明,带有整形元件的相干探测混频器可实现信号光与本振光相似的振幅分布,且相比均匀分布的信号光,混频效率提高了17个百分点。Coherent detection mixer is an essential component of spatial coherent light communication system.Its main function is to mix signal and local oscillator lights to obtain an intermediate frequency signal and then enlarge the optical signal so that the sensitivity of the detector reaches the quantum noise limit.The mixing efficiency is vital for the intensity of the intermediate frequency signal.Therefore,we assume that the local oscillator light has an ideal Gaussian distribution and calculate the influence of different amplitude distributions of the signal light on the mixing efficiency.By designing a set of beam-shaping mirrors,the amplitude distribution of the signal light is changed to a Gaussian distribution,coherent mixing of Gaussian light and Gaussian light is achieved.Experiment results show that the coherent detection mixer with shaping elements can achieve the similar amplitude distribution of the signal light and the local oscillator light,and the mixing efficiency is improved by 17 percentage points compared with the uniformly distributed signal light.

关 键 词：相干光学 空间光混频器 混频效率 光束整形 数值模拟 

分 类 号：TN929.1[电子电信—通信与信息系统]