Research On Automatic Alignment Technology Of Space Optical Fiber Coupling

Free Space Optical Communication(FSO)has many advantages,such as high transmission efficiency and large communication capacity.It has been widely applied in various fields.Space optical fiber coupling teclrnology is one of the key technologies for FSO communication system.High efficiency coupling can directly improve the quality of communication,and the way of automatic alignment can greatly reduce the difficulty of alignment.For this purpose,optical fiber coupling technology is used as the research object in this paper.The automatic alignaent technology of space optical fiber coupling is mainly investigated.The specific work were summarized as follows:1?Based on the principle of model field matching,the basic principle and model of the coupling,of space optical single-mode fcber were theoretically analyzedt and the effects of axial deviation,radial deviation and angle deviation on coupling efficiency xwere discussed respectively.2?According to the parameters of the designed systeirrm,piezoelectric ceramic power supply,piezoelectric ceramic driving circuit,operational amplifier circuit and piezoelectric ceramic fixing mode were desigted respectivelyg The simulated annealing algorithm was deeply researched,and the algorithm was applied to the actual system based on the embedded development platform,and some tests of hardware and software were completed.3?Based on the desicga of hardware and software,a complete set of optical fiber coupling automatic alignment closed-loop control photoelectric circnit based on piezoelectric ceramic was built.Through expeiriments and tests,the automatic alignment of optical fiber coipling was achieved,and the coupling efficiency was improved.The simulated arnealing algoritlun could find the best coupling position in a short time.the coupling efficiency reaches 51.4%.The piezoelectric ceramic drive circuit designed in the system is highly accurate and the piezoelectric ceramic fixed mode is reliable.In the same way,the method could effectively improve the coupling efficiency of optical fiber.It is of great significance for the study of optical fiber coupling.