光波导相控阵阵列结构的优化设计  

Optimization Design of Optical Waveguide Phased Array Structure

作　　者：薛婧婧[1] 刘春波[1] 李瑾[1] 韩香娥[1] 

机构地区：[1]西安电子科技大学理学院,陕西西安710071

出　　处：《光学学报》2012年第F12期276-280,共5页Acta Optica Sinica

摘　　要：光波导光学相控阵具有扫描角度大、驱动电压低及响应速度快等突出优点，是光学相控阵技术发展的主要方向之一。针对均匀光波导阵列的衍射场存在较强栅瓣的问题，研究了光波导相控阵阵列结构参数的设计与优化。根据对称型薄膜介质耦合理论，分析了GaAs光波导阵列单元芯层和包层参数范围。设计了3种不同稀布非均匀阵列结构，并基于最小阵元间距约束条件，利用遗传算法对非均匀阵列结构进行优化，分析了不同层数下单元间距按照随机递增分布、随机分布和子阵分布的栅瓣压缩效果。结果表明非均匀稀布型光波导阵列可有效地抑制栅瓣，其栅瓣主瓣峰值强度比可达到-10．29dB。Optical waveguide phased array, one of the main directions of optical phased arrays development, has highlighted advantages in scattering angle, driving voltage, response speed and so on. For diffraction fields of homogeneous waveguide with strong side-lobes, the design and optimization for structure parameters of optical waveguide phased array are studied. According to symmetric film medium coupling theory, the size ranges of core and cladding are obtained. With the constraints of minimum element space, sparse optical waveguide arrays are designed by genetic algorithm and inhomogeneous optical waveguide arrays are optimized. Element spaces are arranged as randomly increasing distribution , random distribution and sub-array distribution. The results show inhomogeneous sparse optical waveguide arrays have fine side-lobes suppression effect with --10.29 dB intensity ratio of side-lobes to main-lobes, so the performance of scanning beams gets well improved .

关 键 词：光学器件 光学相控阵 光波导阵列 栅瓣抑制 遗传算法 

分 类 号：TN252[电子电信—物理电子学]