具有栅瓣抑制功能的非等间距光学相控阵芯片研究  

Research on non-equal spaced optical phased array chip with grating lobe suppression function

作　　者：刘海鹏 葛锦蔓 谭庆贵[2] 李小军[2] 张福领[3] 曾和平[4,5] 冯吉军 LIU Haipeng;GE Jinman;TAN Qinggui;LI Xiaojun;ZHANG Fuling;ZENG Heping;FENG Jijun(Shanghai Key Laboratory of Modern Optical System,University of Shanghai for Science and Technology,Shanghai 200093,China;National Key Laboratory of Science and Technology on Space Microwave,China Academy of Space Technology(Xi’an),Xi’an 710000,China;The 27th Research Institute of China Electronics Technology Group Corporation,Zhengzhou 450047,China;State Key Laboratory of Precision Spectroscopy Science and Technology,East China Normal University,Shanghai 200241,China;Chongqing Institute of East China Normal University,Chongqing 401120,China)

机构地区：[1]上海理工大学上海市现代光学系统重点实验室,上海200093 [2]中国空间技术研究院西安分院空间微波技术国家级重点实验室,西安710000 [3]中国电子科技集团公司第二十七研究所,郑州450047 [4]华东师范大学精密光谱科学与技术国家重点实验室,上海200241 [5]华东师范大学重庆研究院,重庆401120

出　　处：《空间电子技术》2022年第2期23-28,共6页Space Electronic Technology

基　　金：国家自然科学基金(编号:11774235,61705130,11933005);上海市自然科学基金(编号:17ZR1443400);上海市青年科技启明星计划(编号:19QA1406100);上海市高校特聘教授(东方学者)跟踪计划(编号:GZ2020015);2020年度GFKJ重点实验室基金项目(编号:6142411205410)。

摘　　要：光学相控阵(optical phased array,OPA)作为一种激光扫描技术,具有扫描速度快、精度高、损耗小和易于集成化等优点,在光通信、无人驾驶、激光雷达和航空航天等领域具有广泛的应用前景。为了抑制旁瓣的产生,要求工作波长大于OPA的阵元间距,导致远场主瓣附近必然产生栅瓣,降低OPA扫描精度和扫描范围。提出了一种具有栅瓣抑制功能的非等间距OPA芯片,可实现宽视场、高精度的光斑偏转效果。采用遗传算法优化64路非等间距OPA阵元间距,得到最低栅瓣的阵元分布,实现最佳的栅瓣抑制效果。实验结果表明,在1500~1600 nm波长范围内,优化后波导最小间距为2.2μm,最大间距为11.4μm,芯片远场光斑可实现20°×10°的二维扫描角度,且对旁瓣的抑制作用显著。As a laser scanning technology,optical phased array(OPA)has the advantages of fast scanning speed,high accuracy,low loss,and easy integration,which has broad application prospects in optical communications,unmanned driving,laser radar,aerospace and other fields.In order to suppress the generation of side lobes,the operating wavelength is required to be greater than the OPA’s element spacing,which results in grating lobes inevitably generated near the main lobe of the far field,which reduces the scanning accuracy and scanning range of the OPA.A non-equal spacing OPA chip with grating lobe suppression function is proposed in this paper,which can achieve wide field of view and high-precision spot deflection.The genetic algorithm is used to optimize the array element spacing of 64 channels of non-equal spacing OPA to obtain the element distribution of the lowest grating lobe and achieve the best grating lobe suppression effect.The experimental results show that in the wavelength range of 1500-1600 nm,the optimized waveguide has a minimum spacing of 2.2μm and a maximum spacing of 11.4μm.The far-field spot of the chip can achieve a two-dimensional scanning angle of 20°×10°,and it has a significant inhibitory effect on side lobes.

关 键 词：光学相控阵 激光雷达 非等间距 遗传算法 

分 类 号：TN24[电子电信—物理电子学] V443[航空宇航科学与技术—飞行器设计]