1 中国科学院上海光学精密机械研究所光芯片集成研发中心，上海 201800
2 上海科技大学，上海 201210
3 中国科学院大学，北京 100049
4 中国科学院上海光学精密机械研究所高功率激光物理联合实验室，上海 201899
提出了一种用高阶抑制二维达曼光栅作为分光元件替代普通衍射光栅实现微透镜阵列焦距快速测量的方法。高阶抑制二维达曼光栅具有优良的分光效果，且高阶衍射级次能够得到有效抑制，通过信噪比的提高降低焦距测量误差。设计并制备了一分五的高阶抑制二维达曼光栅，分束后的光束经过微透镜，在其焦面附近形成高对比聚焦光斑阵列。相比常规一维光栅，所提方法通过测量每个微透镜焦面内光斑两两之间的距离，得到多个焦距值，从而有效减少测量的随机误差。实验结果表明，该方案对微透镜阵列焦距的单次测量误差小于3.5%，重复测量误差在4.5%之内。该方案对微透镜阵列的焦距分布快速评估具有实用价值。
测量 高阶抑制达曼光栅 微透镜阵列 焦距测量
1 中国科学院上海光学精密机械研究所信息光学与光电技术实验室，上海 201800
2 中国科学院大学材料与光电学院，北京 100049
3 暨南大学光子技术研究院，广东 广州 510632
受益于光子独特的优势，光计算技术在构建高速、高算力和高能效比的专用计算加速器方面被寄予厚望，目前已经涌现出了许多极具吸引力的方案。特别是对于涉及运算量巨大的二维矩阵-矩阵乘加操作的专用场景，光计算有望在算力和能效比等方面实现超越当前最先进电子计算机几个数量级的性能提升。不同于电子计算通过构建逻辑门实现通用数字计算，主要受深度学习驱动而复兴的光计算更倾向于模拟计算。本文从模拟和数字光计算的角度出发对主流的光计算架构进行分析和讨论，指出了目前光计算技术发展面临的瓶颈，并对光计算未来的发展趋势进行了展望。
光计算 模拟光计算 数字光计算 光计算架构 光学矩阵计算 光学神经网络 光电智能计算 光学信号处理
Author Affiliations
Abstract
1 Laboratory of Information Optics and Optoelectronic Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3 Institute of Photonics Technology, Jinan University, Guangzhou 510000, China
A planar-integrated optical system (PIOS) represents powerful optical imaging and information processing techniques and is a potential candidate for the realization of a three-dimensional (3D) integrated optoelectronic intelligent system. Coupling the optical wave carrying information into a planar transparent substrate (typically fused silica) is an essential prerequisite for the realization of such a PIOS. Unlike conventional grating couplers for nano-waveguides on the silicon-on-insulator platform, the grating couplers for PIOS enable to obtain a higher design freedom and to achieve much higher coupling efficiency. By combining the rigorous coupled wave algorithm and simulated annealing optimization algorithm, a high-efficiency asymmetric double-groove grating coupler is designed for PIOS. It is indicated that, under the condition of the normal incidence of TE polarization, the diffraction efficiency of the st order is over 95%, and its average value is 97.3% and 92.8% in the C and C+L bands. The simulation results indicate that this type of grating coupler has good tolerance and is expected to be applied in optical interconnections, waveguide-based augmented reality glasses, and planar-integrated 3D interconnection optical computing systems.
double-groove grating vertical coupling planar integration optical computing Chinese Optics Letters
2022, 20(9): 090501
