Bidirectional high sidelobe suppression silicon optical phased array

作     者：HUAQING QIU YONG LIU XIANSONG MENG XIAOWEI GUAN YUNHONG DING HAO HU 

作者机构：DTU ElectroDepartment of Electrical and Photonics EngineeringTechnical University of DenmarkDK-2800 Kgs.LyngbyDenmark Jiaxing Key Laboratory of Photonic Sensing&Intelligent ImagingJiaxing 314000China Intelligent Optics&Photonics Research CenterJiaxing Research Institute Zhejiang UniversityJiaxing 314000China 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2023年第11卷第4期

页      面：659-668页

核心收录：

学科分类：0808[工学-电气工程] 070207[理学-光学] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：Novo Nordisk Fonden(NNF22OC0080333) Villum Fonden(15401) 

主　　题：sidelobe optical directions 

摘      要：An optical phased array(OPA),the most promising non-mechanical beam steering technique,has great potential for solid-state light detection and ranging systems,holographic imaging,and free-space optical communications.A high quality beam with low sidelobes is crucial for long-distance free-space transmission and ***,most previously reported OPAs suffer from high sidelobe levels,and few efforts are devoted to reducing sidelobe levels in both azimuthal(φ)and polar(θ)*** solve this issue,we propose a Y-splitter-assisted cascaded coupling scheme to realize Gaussian power distribution in the azimuthal direction,which overcomes the bottleneck in the conventional cascaded coupling scheme and significantly increases the sidelobe suppression ratio(SLSR)in theφdirection from 20 to 66 dB in theory for a 120-channel ***,we designed an apodized grating emitter to realize Gaussian power distribution in the polar direction to increase the *** on both designs,we experimentally demonstrated a 120-channel OPA with dual-Gaussian power distribution in bothφandθ*** SLSRs inφandθdirections are measured to be 15.1 d B and 25 dB,***,we steer the beam to the maximum field of view of 25°×13.2°with a periodic 2λpitch(3.1μm).The maximum total power consumption is only 0.332 W with a thermo-optic efficiency of 2.7 m W∕π.