像差及湍流对90°空间光混频器性能的影响研究  

Research on Influence of Aberration and Turbulence on Performance of 90°Space Optical Hybrid

作　　者：宫喜宇 张鹏[1,2,3] 吴潇杰 南航 郭代芳[1,2] 王超 佟首峰[1,2,3] GONG Xiyu;ZHANG Peng;WU Xiaojie;NAN Hang;GUO Daifang;WANG Chao;TONG Shoufeng(College of Optoelectronics Engineering,Changchun University of Science and Technology,Changchun 130022,China;National and Local Joint Engineering Research Center of Space Optoelectronics Technology,Changchun University of Science and Technology,Changchun 130022,China;Shenzhen Pengcheng Laboratory,Shenzhen,Guangdong 518052,China)

机构地区：[1]长春理工大学光电工程学院,长春130022 [2]长春理工大学空间光电技术国家与地方联合工程研究中心,长春130022 [3]深圳鹏城实验室,广东深圳518052

出　　处：《光子学报》2021年第4期66-80,共15页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.61705019,61805028);吉林省科技厅自然基金(No.20180101338JC);吉林省国际科技合作项目(No.20200801053GH);吉林省教育厅基金(Nos.JJKH20200752KJ,JJKH20190563KG)。

摘　　要：光信号在大气湍流中发生畸变,畸变光信号经过有缺陷的光学天线和空间光混频器后,存在混频效率低及抖动的问题。针对空间输出型和单模输出型的90°空间光混频器,推导了带初级像差的90°空间光混频器模型,并研究了湍流对混频效率的影响。仿真结果表明,对于探测器靶面半径为50μm的空间输出型混频器,像差量为0.2λ的倾斜、球差、离焦、彗差和像散分别导致混频效率下降9.8%、0.6%、0.36%、0.02%和0.01%。对于单模输出型混频器,像差量为0.2λ的倾斜、像散、离焦、彗差和球差分别导致混频效率下降14.11%、8.39%、6.35%、2.63%和1.13%。湍流强度Cn^(2)小于6.4×10^(-17)m^(-2/3)时,空间输出型比单模输出型混频器的混频效率高19%以上,在湍流强度Cn^(2)大于6.4×10^(-16)m^(-2/3)时,两者混频效率接近于0。最后设计加工了空间输出型和单模输出型90°混频器,并搭建性能测试平台。对于探测器靶面半径为50μm的空间输出型混频器,像差量为0.2λ的倾斜、球差和离焦导致混频效率下降52%、10%和6%;对于单模输出型混频器,像差量为0.2λ的倾斜、像散和离焦导致混频效率下降65%、24%和11%,其他像差对混频效率没有影响。湍流对混频器性能影响的实验结果显示,空间输出型光混频器中频信号值的标准差为21.388,该值远低于单模输出型标准差247.442。The optical signal is distorted in the atmospheric turbulence,after passing through the defective optical antenna and the space optical hybrid,there are problems of low hybrid efficiency and jitter.According to the influence of 90°space optical hybrid with space output and single-mode output,the hybrid efficiency model of space optical hybrid with primary aberration is derived.Then the influence of aberration and turbulence on hybrid efficiency is studied.The simulation results show that for the space output 90°space optical hybrid with a target radius of 50μm of the detector,the tilt,spherical aberration,defocus,coma,and astigmatism with aberration of 0.2λcause the hybrid efficiency to decrease by 9.8%,0.6%,0.36%,0.02%and 0.01%,respectively.Astigmatism and coma have no effect on the hybrid efficiency.For the single-mode output hybrid,the tilt,astigmatism,defocus,coma,and spherical aberration with aberration of 0.2λcause the hybrid efficiency to decrease by 14.11%,8.39%,6.35%,2.63%and 1.13%,respectively.When the turbulence intensity Cn^(2)<6.4×10^(-17) m^(-2/3),the hybrid efficiency of the spatial output type is more than 0.19 higher than that of the single-mode output 90°space optical hybrid,and when the turbulence intensity Cn^(2)>6.4×10^(-16) m^(-2/3),the hybrid efficiency of the two is close to zero.Finally,the space output and single-mode output optical hybrid are designed and processed,and the performance test platform is built.For the space output hybrid with a detector target surface radius of 50μm,the tilt,spherical aberration,and defocus of 0.2λcause the hybrid efficiency to decrease by 52%,10%,and 6%;for the single-mode output hybrid,the tilt,astigmatism and defocus with aberration of 0.2λcause the hybrid efficiency to decrease by 65%,24%and 11%.Other aberrations have no effect on the hybrid efficiency.The experimental results of turbulence on the hybrid performance show that the standard deviation of the intermediate frequency signal value of the space output optical hybrid is 21.388,which

关 键 词：空间相干光通信 90°空间光混频器 波前像差 大气湍流 混频效率 

分 类 号：TN929.1[电子电信—通信与信息系统]