Fig. 4
From: Chip-to-chip optical multimode communication with universal mode processors
The training of chip-to-chip MDM communication. a Experimental setup of the MDM communication system. A 4f system consisting of four lenses perfectly transmits the generated modes to the grating antenna array of the mode sorter. b The evolution of the lowest extinction ratio among four chip-generated LP modes during training. c The bar chart of the routing state during training. d The bar charts of three different routing schemes after their respective training