Gaussian vortex beam modeling for multiplexing in data communication using OAM

Optical vortices carrying orbital angular momentum (OAM) are being explored for improving the overall aggregate capacity along with the spectrum efficacy of data communications systems. The OAM carrying vortex beams provide an additional degree in space division multiplexing consistent with other physical dimensions like amplitude, frequency/wavelength, polarization & phase, leading towards continual increase of the overall transmission capacity along with the spectral efficacy through N-dimensional multiplexing. OAM has unlimited modes which are intrinsically orthogonal thus rendering OAM carrying beams to be efficiently multiplexed and subsequently demultiplexed. In this paper we simulate and study the intensity profiles and phase structures of Gaussian vortex beams. The clockwise and anti-clockwise spiraling of the phase structures for mutually opposite values of the topological charge of OAM and also diverging pattern of the phase structure along the direction of propagation are simulated.