*In Optics express*

^{11}multiplications and accumulations per second (MACs/s) and a multiplication of a 4 × 4 matrix and a 4 × 1 vector at 2.69×10

^{9}MACs/s. The edge extraction of 32 × 32 binary images is also realized in simulation by optical 2D convolution at 5×10

^{8}MACs/s. The proposed optical computing unit can be a key building block to process complex computing tasks with advanced deep learning algorithms and it is promising for the future photonic neural network circuits.

*Huang Yuyao, Zhang Wenjia, Yang Fan, Du Jiangbing, He Zuyuan*

*2019-Jul-22*