This book presents the key technologies of coherent optical wireless communication, covers topics such as beam coupling, signal optical polarization control and distorted wavefront correction. It discusses the principle of coherent optical communication and heterodyne detection conditions. In this book, the array coupling receiving technology and large aperture coupling technology are introduced to realize the spatial optical fiber coupling; simulated annealing algorithm, particle swarm optimization algorithm and SPO algorithm are used to control the polarization state of the signal beam; and the correction of distorted wavefront of the signal beam by adaptive optics technology and wavefront sensorless adaptive optics technology are analyzed, and the influence of beam mode on coherent detection performance is elaborated. Both theoretical deduction and experimental results are included in this book, which can help readers further understand the theoretical knowledge.

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Xizheng Ke, Doctor of Science, is second-level professor, head of the discipline of information and communication systems of Xi'an University of Technology, and deputy director of the Key Laboratory of Military-civilian Joint Construction of Intelligent Cooperative Networks in Shaanxi Province. He is a famous teacher in Shaanxi Province, fellow of Chinese Institute of Electronics, director of Chinese Optical Engineering Society and executive director of Shaanxi Optical Society. He received a bachelor's degree from Shaanxi Institute of Technology in 1983 and a doctor of science degree from the University of Chinese Academy of Sciences in 1996. From 1997 to 2002, he conducted post-doctoral research at Xidian University and the Second Artillery Engineering College. Dr. Xizheng Ke is a member of editorial board of "Journal of Electronics," "Infrared and Laser Engineering," "Journal of Electronic Measurement and Instrument," "Laser Technology," "Applied Optics," "Journal of Xi'an University of Technology," "Journal of Time and Frequency" and "Journal of Atmospheric Science Research." He is the national science and technology award review expert and a member of the disciplinary review group of the Shaanxi Academic Degrees Committee. In 2000, Dr. Xizheng Ke won the Outstanding Young Scholar Award of the Chinese Academy of Sciences. In 2009, he was awarded the title of "Excellent Science and Technology Commissioner of Guangdong Province by the Ministry of Science and Technology." In 2015, he was awarded the title of "A Golden Phoenix on Green Poplar" in Yangzhou City. In 2018, he won the China Industry-University-Research Innovation Award, and in 2019, he won the China Industry-University-Research Innovation Achievement Award. Since 2001, he has won 16 provincial and ministerial science and technology awards, including 1 first prize and 5 second prizes. He has obtained more than 20 nationally authorized invention patents, published 10 monographs in Science Press and published more than 400 academic papers in domestic and foreign journals. More than 30 PhD. candidates have been cultivated in his direction.