Multi-hop convergent FSO-UWOC system to establish a reliable communication link between the islands

Abstract

Most part of the earth is filled with water. Oceans hold around 97% of this water, and hence they are the heart of mother earth. People use these oceans for traveling, edibles, and communication. Many islands in this world consist of a large number of sub-islands. Establishing a communication link or a network between these sub-islands is highly challenging one. In this paper, we proposed a decode-and-forward multi-hop convergent free space optical — underwater wireless optical communication (FSO-UWOC) system for establishing high-speed network connectivity between the islands. The closed form expressions of outage probability of the differential phase shift keying (DPSK) based FSO-UWOC system over a Malaga distributed FSO channel and Gamma–Gamma distributed UWOC channel is derived. The results are analyzed and plotted for different weather conditions, turbulences and pointing errors of FSO and UWOC, respectively. The simulated results show that the proposed system will be useful in design of convergent UWOC-FSO system in coastal environments where the weather changes frequently such as clear, rain, haze etc. © 2020 Elsevier B.V.