Optical-Antenna Technologies

Optical antenna is used to transmit or collect optical signals in free space optical communication system, and the structure of optical antenna determines the detection performance of the system. This chapter introduces the basic structures of optical antenna, the research progress of Cassegrain optical antenna, pointing, acquisition, and tracking (PAT) system without independent beacon and the point-to-multipoint optical antenna in detail, the future research direction of optical antenna is prospected.