1.Optical Communications Laboratory,Ocean College,Zhejiang University,Zhoushan;2.Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province,Ocean College,Zhejiang University,Zhoushan
National Natural Science Foundation of China (NSFC) (61971378); Strategic Priority Research Program of the Chinese Academy of Sciences (XDA22030208); Zhoushan-Zhejiang University Joint Research Project (2019C81081).
Due to the advantages of high bandwidth, low delay, and anti-interference ability, underwater optical wireless communication (UOWC) has become one of the important ways of underwater data transmission. The development history of UOWC is briefly described, and the research status of the high-speed, long-distance and high-reliability UOWC systems based on high-performance optoelectronic devices and digital signal processing (DSP) is summarized. The modulation technology can realize the tradeoff between data rate and transmission distance. Channel equalization technology can eliminate inter-symbol interference and increase the modulation bandwidth. Channel coding technology can correct the errors in the received signals. Diversity and multiplexing technology can improve the reliability and data rate of the system, respectively. In addition to researching high-performance optoelectronic devices, the employment of DSP technology can further improve the system performance in another way.