Visible light communication with underwater communication

Today, high-cost and peripheral solutions are used for underwater communication. On the other hand, visible light communication (VLC) is one of the new generation communication technologies and aims to transmit data using light in the visible region of the electromagnetic spectrum. Due to the inadequacy of Radio Frequency (RF) technology in the underwater environment, VLC technology, which is its most important competitor, is much more advantageous in terms of data transmission. In the VLC system designed in this study, communication is carried out only with the targeted receiver by using the linear directionality of the light. Studies have been done on data transmission confidentiality protocol with VLC, in which data is encrypted with a secret phase shift keying method. Communication is provided by the designed transmitter and receiver circuits and the microprocessor, which can perform bidirectional data transmission using secret keying coding. The most important difference that separates RF and optical communication in the underwater environment is that the water environment is perceived as a conductor by RF, while it is perceived as a dielectric for VLC. The proposed protocol for the aquatic environment, which is the focus of the study, has been experimentally tested in underwater environments with different saline concentrations, at different routing angles between the receiver and transmitter, considering the data packet delivery rate and latency performance measurements. The tests performed were characterized by an SCD sensor and it was aimed to develop a motor control and audible warning system by providing simulations. In this study, the underwater communication performance of VLC is discussed experimentally for different concentrations of salt in a 1 meter aquarium.