Fig. 1: Schematic and configurations of the mode generator.
From: Reconfigurable spatial-mode generation and multiplexing on a scalable photonic chip
a Schematic of the reconfigurable spatial mode generator, including a linear operational circuit (light green) and an OAM generator circuit (beige). By correctly biasing the linear operational circuit, one input can be split into four outputs with certain relative phases and routed to the inputs of the OAM generator circuit. A detailed illustration of the OAM generator circuit is in Fig. 4c. After that, four OAM modes can be generated from the emitter to combine and form an LP mode. Intensity pattern and polarization arrows of the simulated (b) OAM modes, c LP modes, and d CV modes. The polarization distribution of the modes is labeled by the arrows. LOC configurations to generate, e OAM modes, f LP mode, and g CV modes. The diagrams take the example of channel #1, and the signal path is colored in red. For e, by setting MZI #7 with phase difference φ7 = π and MZI #10 with φ10 = π, the input is routed to generate \(OA{M}_{-1}^{+}\). For f, by setting MZI #7 with φ7 = π/2 and MZI #10, #13 with φ10 = φ13 = π/2, the input is routed to generate \(L{P}_{11}^{odd,y}\) by combining \(OA{M}_{-1}^{+}\) and \(OA{M}_{+1}^{-}\). For g, by setting MZI #7 with φ7 = π/2 and MZI #10, #13 with φ10 = φ13 = π, the input is routed to generate \(E{H}_{01}^{odd}\) by combining \(OA{M}_{+1}^{+}\), \(OA{M}_{-1}^{+}\), \(OA{M}_{+1}^{-}\) and \(OA{M}_{-1}^{-}\). h Input channel mapping to generated modes.
