激光技术, 2019, 43 (1): 98, 网络出版: 2019-01-22  

基于波导间隔余弦分布的光学相控阵研究

Study on optical phased arrays based on waveguide spaced cosine distribution
作者单位
1 华中科技大学 光学与电子信息学院, 武汉 430074
2 湖北大学 物理与电子科学学院, 武汉 430062
摘要
为了提高稀疏光学相控阵的精度和效率, 采用输出波导间隔成余弦分布的结构, 基于绝缘体上硅平台设计出1×16光学相控阵; 结合有效折射率法和2-D有限差分传播法进行了远场强度分布仿真模拟。结果表明, 边瓣抑制比从89.72%减小到41.46%, 主瓣半峰全宽从1.20°被压缩到0.81°;这种设计方法能够显著抑制栅瓣, 进一步压缩主瓣。该研究在机器人避障、无人驾驶、目标探测等光束偏转领域将有广泛的应用前景。
Abstract
In order to improve the precision and efficiency of sparse optical phased array, 1×16 optical phased array was designed based on silicon-on-insulator(SOI) platform by using the structure of spaced cosine distribution of output waveguides. Combining the effective refractive index method and 2-D finite difference beam propagation method, the far-field intensity distribution was simulated. The results show that, the side lobe suppression ratio decreases to 41.46% from 89.72%, and the full width at half maximum of the main lobe is compressed to 0.81° from 1.20°. This design method can significantly suppress the grating lobes and further compress the main lobe, and has a promising future in the field of beam deflection, such as robot obstacle avoidance, pilotless, target detection and so on.

郭亚平, 赵江, 李波. 基于波导间隔余弦分布的光学相控阵研究[J]. 激光技术, 2019, 43(1): 98. GUO Yaping, ZHAO Jiang, LI Bo. Study on optical phased arrays based on waveguide spaced cosine distribution[J]. Laser Technology, 2019, 43(1): 98.

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