Lian Daixin, Zhao Shi, Li Wenlei, Chen Jingye, Dai Daoxin, Shi Yaocheng
State Key Laboratory for Modern Optical Instrumentation, Center for Optical & Electromagnetic Research, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Zijingang Campus, Hangzhou 310058, China.
Ningbo Innovation Center, College of Optical Science and Engineering, Zhejiang University, Ningbo Campus, Ningbo 315100, China.
Nanophotonics. 2024 Jan 2;13(1):29-37. doi: 10.1515/nanoph-2023-0519. eCollection 2024 Jan.
An optical phased array (OPA) with 2-D circular sparse array aperture has been proposed and demonstrated in the silicon integrated photonic platform. The sparse distribution of the antenna array can realize no grating lobes in 2-D full field of view (FOV). To achieve fast and accurate phase calibration for OPA, an improved rotating element electric field vector algorithm based on golden section search method (GSS-REV) has also been proposed and verified. The 32-element antenna sparse distribution of the proposed OPA is designed and fabricated. A far-field beam steering measurement across 20° × 20° range features the side lobe suppression ratio (SLSR) of larger than 4.81 dB and a full width at half-maximum (FWHM) of approximately 0.63° × 0.59°. The resolvable points are derived to be ∼1076. The OPA chip has also been demonstrated on range measurement with frequency-modulated continuous-wave (FMCW) system.
一种具有二维圆形稀疏阵列孔径的光学相控阵（OPA）已在硅集成光子平台上被提出并得到验证。天线阵列的稀疏分布可在二维全视场（FOV）中实现无栅瓣。为实现OPA的快速精确相位校准，还提出并验证了一种基于黄金分割搜索法（GSS - REV）的改进型旋转元件电场矢量算法。所提出的OPA的32元天线稀疏分布已被设计并制造出来。在20°×20°范围内进行的远场波束扫描测量显示，旁瓣抑制比（SLSR）大于4.81 dB，半高全宽（FWHM）约为0.63°×0.59°。可分辨点数约为1076。该OPA芯片也已在调频连续波（FMCW）系统的距离测量中得到验证。
