Wireless optical communication (WOC) has been widely concerned by the industry due to its advantages of wide bandwidth, high transmission rate, better security, and no need of authorized spectrum. As the fifth generation communication and beyond five generations the rapid development of communication system, and to give full play to the advantages of WOC, this paper reviews the relay technology under indoor wireless optical communications, outdoor wireless optical communications and underwater wireless optical communication, elaborates based on relay technology of the three methods of communication protocol, channel model and modulation method, combining with specific experimental analysis of its performance. Finally, main problems of relay WOC are pointed out and the potential solutions are also given.
As one of the most important applications of 5G technology, vehicle scenarios have strict requirements in end-to-end delay, reliability and data rate. Based on the huge advantages of free space Optical (FSO) communication technology, this paper summarizes the research status of vehicle FSO communication under the 5G evolution background, by integrating satellite, air, ground and underwater communications into a unified wireless network through unmanned vehicle platforms, the research progress of "space, earth and sea integration" optical transmission link is built to realize fast, stable and large-capacity data transmission system. The technical challenges of vehicle FSO communication faced with are also discussed and its future development is prospected.
Mine accidents are frequent, miner safety and machine production was an important thing in the mine. Real-time communication and positioning one of the necessary things in mine, but he interference and shielding of rf signal are serious in mine scene. Optical wireless technology can be used underground to provide communication and location for miners. In this paper, the research status of optical wireless technology in mines is summarized, from the communication and location of two aspects and the application of sensing technology and robot wireless and wired optical in mines. Finally, the prospect of optical wireless technology in mines is summarized.
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