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

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。

In order to improve the precision and efficiency of sparse optical phased array,1×16optical 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 and2-D finite difference beam propagation method,the far-field intensity distribution was simulated.The results show that,the side lobe suppression ratio decreases to41.46%from89.72%,and the full width at half maximum of the main lobe is compressed to0.81°from1.20°.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.