基于微光学阵列差分真时延网络的光学多波束合成系统  

Optical Multi-Beam Synthetic System Based on Micro-Optical Array Differential True Time Delay Network

作　　者：丁志丹[1,2] 杨飞[2] 蔡海文[2] 王书楠[3] 余胜武[3] 侯培培[2] 孙建锋[2] 王廷云[1] 

机构地区：[1]上海大学特种光纤与光接入网省部共建重点实验室,上海200444 [2]中国科学院上海光学精密机械研究所中国科学院空间激光信息传输与探测技术重点实验室,上海201800 [3]中国电子科技集团第五十一研究所,上海201802

出　　处：《中国激光》2017年第4期195-203,共9页Chinese Journal of Lasers

摘　　要：提出了一种基于微光学阵列差分真时延网络的光学多波束合成系统,研究了该系统中结构参数与波束形成性能的关系。通过改进基于微光学阵列差分真时延网络的参数,优化了差分真时延网络的初相位以及幅相一致性;通过改进天线单元的参数结构,优化了各个天线单元的方向图,解决了合成波束时容易出现栅瓣及波束较宽的问题。所提系统可抑制栅瓣,得到的旁瓣消光比大于10dB,频率为3.8GHz时的3dB带宽为35°,频率为4.9GHz时3dB带宽为29°,指向误差小于1.5°,频率覆盖范围为2~6GHz。该系统在光学相控阵雷达中具有广阔的应用前景。An optical multi-beam synthetic system based on differential true time delay network which is with micro- optical array is proposed, and the relationships among the structural parameters and the beam-forming performance of the proposed system are studied. The initial phase and the consistence of amplitude and phase are optimized when we optimize the parameters of differential true time delay network hased on micro-optical array. The directional diagrams of antenna elements are optimized when we optimize the structural parameters of antenna elements, and the problems of existing grating lobe and wide beam in beamforming are solved. At last, the grating lobe is suppressed, the extinction ratio of sidelobe is larger than 10 dB, the 3 dB bandwidths are 35° at 3.8 GHz and 29° at 4.9 GHz, the steering error is less than 1.5°, and the frequency covering band is 2-6 GHz. The proposed system has wide application prospects in optically controlled phased array radar.

关 键 词：光通信 光学多波束合成系统 差分真时延网络 微光学结构 

分 类 号：TN29[电子电信—物理电子学]