Analysis of data transmission in underwater optical wireless communication in vertical channels

In this paper, the main aim is to study, simulate and investigate a basic underwater optical wireless vertical communication system in a direct line of sight (LoS) configuration for different water types, i.e., clear seawater and turbid water. In these conditions, blue light-emitting diode (LED)-based transmitter is compared with a blue laser-based transmitter for non-return to zero on-off keying (NRZ-OOK) modulation. The variations of Q-Factor, minimum bit error rate (BER), signal power and signal-to-noise ratio (SNR) are studied with variable distance and variable bit rate. The system performance is analyzed in vertical channel by visualizing the eye diagrams. This study also emphasizes the selection of a suitable frequency of light that can traverse the channel with minimum path loss and a compatible bit rate.