Diffractive Deep Neural Network for Optical Orbital Angular Momentum Multiplexing and Demultiplexing - Wang, P.; Xiong, W.; Huang, Z.; He, Y.; Liu, J.; Ye, H.; Xiao, J.; Li, Y.; Fan, D.; Chen, S. (IEEE Journal of Selected Topics in Quantum Electronics, Selected Topics in Quantum Electronics, IEEE Journal of, IEEE J. Select. Topics Quantum Electron., 2022)