Fig. 2
From: Chip-to-chip optical multimode communication with universal mode processors
Training the generator chip. a Experimental setup for training the mode generator. The phase distribution of the four LP modes is loaded onto the spatial light modulator (SLM), and a lens is used to match the size of the generated LP modes and the grating antenna array. b The far-field distribution of the optical modes generated by the SLM with corresponding phase distribution. c The evolution of the lowest extinction ratio among the four LP modes during training. d The bar chart of the routing state during training