Design And Research Of Optical Antenna For Wireless Optical Communication System

Free-space optical communication is a two-direction communication method that uses laser as a carrier to transmit data in the atmospheric channel and provides wireless high-speed point-to-point or point-to-multipoint communication.Optical antenna is one of the key technology,the main function is to efficiently transmit and receive laser with modulated signal.The performance of the optical antenna directly affects the communication quality and stability of the free space optical communication system.Because of the large loss of Cassegrain optical antenna,and it is difficult to design support structure,according to the requirements of wireless optical communication system,based on the optical design software ZEMAX,Transmit and receive the transmission of the optical antenna,A separated and transmissive optical antenna with a center wavelength of 1550 nm is designed,and the design results were evaluated.The influence of assembly error on the wireless optical communication system is analyzed,and the experiment is carried out to detect the multi-optical axis non-parallelism.The main contents of this thesis are as follows:(1)The development of wireless optical communication technology and optical antenna both at home and abroad is introduced,the key technology and future development trend of optical antenna is introduced.(2)The design flow of the optical antenna is worked out,and the relationship between the wave aberration and the bit error rate and the communication rate of the wireless optical communication system is deduced.(3)Designed a set of the center wavelength of 1550 nm transceiver optical antenna.Receiving antenna imaging quality to suffice the Marexia decree,image quality is excellent.Using the geometric image analysis method to measure the antenna coupling efficiency as high as 59.478%,to suffice the requirements of wireless optical communication systems.(4)The link equation of the wireless optical communication system is established,and the loss of the system is analyzed,and the imbalance of the optical antenna is analyzed.Based on the theory of Gaussian beam propagation,the influence of laser transmission power,transmission distance,divergence angle,detector sensitivity and other factors is explored,and the technical work of the system is provided.(5)design experiment completed the double telescopic system optical axis nonparallelism detection.The parallelism of the double telephoto system is 82.456 mrad,and the precision is more than 0.436 mrad.This paper analyzes the experimental error,and proposes a improved scheme of small aperture parallel light pipe method based on precision two-dimensional displacement platform.The measurement accuracy is 1.829 mrad and the precision is 0.0326 mrad.