Short Range Underwater Visible Optical Communication

The future ocean environment will be increasingly complicated, and the exploration of ocean will be progressive. Wireless underwater communication will become a challenging task. Most traditional communication methods, which are well established for digital communication in air, do not work in water. At present, sonar communication is the best method, but is limited by low bandwidth. In recent years, underwater optical communication is widely researched. In this paper, we also investigate underwater optical communication.First of all, the paper analyzes the intention and meaning to research underwater optical communication technology, and introduce the development of underwater optical communication.The first main focus of this thesis is to study how to classify the type of water, and to study the optical properties of ocean water, which will offer foundations to select appropriate wavelength for underwater optical communication. The secondary focus of this thesis is to propose a method of underwater optical communication. There are two parts to the project, primary device and secondary device, and only the secondary device is designed in this paper. In this paper, we used IrDA communication controller MCP2150 , MAX3120,which is a low-Profile, 3V, 120μA IrDA Infrared Transceiver, a high powered LED used as emitter and a SLD-70BG2 used as receiver.Secondly, we analyze the link process of secondary device and primary device, and design the data transmission process and programming the ID of secondary device.Finally, the paper was summarized and the expectation was made.