Technology Research And System Implementation Of UV Optical Communications

Ultraviolet optical communication (UVC) which uses ultraviolet light as the carrier and free space as transmission medium is a new type of optical wireless communication (OWC) technology. As a supplement for the wireless radio communication mode, UVC, as well as visible light communication (VLC), belonging to optical wireless communication, has significant application and research values. Moreover, UVC has drawn great attention as a result of its specialty like strong anti-interference ability, low interception rate, low direction differentiation, able to work at all-weather and all-direction via a non-line-of-sight link.Some of domestic and foreign research institutes have obtained many achievements, but there are barely any representative communication method and prototype systems. Supported by the National863plan project and National Natural Science Foundation of China (NSFC), aiming to improve the performance of the communication systems, this paper conducts research on some key techniques that can improve the system’s performance and prototype system design.This paper firstly presents the communication mechanism, communication mode and communication features of the solar-blind UV communication with the respect to UV light transmission characteristics through atmospheric, then summarizes channel model of NLOS UVC systems like single scattering and multiple scattering channel model, as well as explains or analysis their applicable conditions respectively.This paper establishes a diversity reception theoretical model of UVC system and analysis the relationship between path loss, communication distance, transmitting light power and BER performance with the help of software simulation. The simulation results indicates that diversity reception is valid in improving the BER performance of UVC system.This paper also designs and implements a UVC prototype experimental platform based on diversity reception. Some key component or module’s selection and hardware circuit design method are also presented in the paragraph. BER test scheme are designed and an actual experiment is conducted outdoors. The experimental results shows that diversity reception technique plays a significant role in improving the BER performance and communication range of UVC system.