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
集成光学 光学相控阵 余弦分布 远场强度分布 光束偏转 integrated optics optical phased array cosine distribution far field intensity distribution optical beam deflection
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.