Performance of Bit Error Rate (BER) in OOK Modulation Using Orbital Angular Momentum (OAM) Carrying Gaussian Vortex Beam

Achieving higher spectral efficiency is an absolute necessity in this era where demand for higher bandwidth is ever increasing. Optical communication emerged as potential solution in this direction to the requirement. A laser light beam carrying an Orbital Angular Momentum (OAM) has opened a new paradigm in the data communications owing to their theoretically infinite and orthogonal modes which can be efficiently multiplexed. In this paper we studied the propagation of Gaussian vortex (GV) beam for different order of topological charge. The data communication system has been modelled with OAM carrying GV beam as a carrier, modulation using ON-OFF keying (OOK) and a channel with additive white Gaussian noise (AWGN) channel. The modelled system was used to calculate the bit error rates (BER) for various signal to noise ratio (SNR) values and the results are in accordance with the theoretical expectations.