Performance evaluation of perfect optical vortices transmission in an underwater optical communication system

In this paper, we experimentally evaluated the performance of underwater optical communications using 1Mbit/s on-off keying (OOK) signals of perfect optical vortices. Perfect optical vortices generated by Fourier transformation of the Bessel-Gaussian beam are propagated through a 2.6m underwater medium and affected due to various water conditions such as stagnant water, water flow, temperature difference and air bubbles. So the beam wander and fluctuation of the signal due to mentioned effects are studied. The air bubbles have the maximum effect on signal fluctuations and beam wanders. The measurement of the system bit error rate (BER) based on the SNR for these situations matches with the results of wandering and fluctuations. The system BER is studied for different values of signal to noise ratio (SNR) and its value is more degraded due to the air bubbles.