A Silicon Photonic Design Concept for a Chip-to-Fibre Orbital Angular Momentum Mode-Division Multiplexer

Orbital angular momentum (OAM) modes in fibres are modes that potentially can be used for mode-division multiplexing systems. OAM modes possess a helical phase front which can be written as exp(iLφ), with L being the topological charge and φ being the azimuthal coordinate. Here, we present a chip capable of multiplexing waveguide modes to OAM modes in a fibre in the C-band.