The Efficient Technology Of Fiber Coupling Research In The Receiver Of Space Laser Communication System

This paper made a study to space fight coupling into the fiber,and analyze its influencing factors and solution.And ultimately to improve coupling efficiency and aim to enhance communication performance.First,this thesis researched the developing space laser communication at home and abroad and ummarize,then leaded to the necessity and importance of space fight coupling into the fiber by selecting different detection methods.The main contents are as follows:proposed single-mode fiber coupling theory, and analyzed fiber coupling efficiency changes due to random angle jitter and atmospheric turbulence.Utilized adaptive optics theory optimize the coupling system and analyzed the influencing factors of influencing coupling efficienty of multimode fiber coupling efficienty.Such as the off-axis of commucation ofterminal for receiving beam with fiber coupling.It is concluded that when the partial shaft below4.5 ?m,the multimode optical fiber coupling efficiency still guarantee in more than 80%,Then carryyed on the single-mode fiber,multimode fiber coupling experiments,the coupling efficiency of the wavelength of 1550 nm space light and single-mode fiber can reach 47% without interference,the coupling efficiency of multimode optical fiber can reach80%,obtained the data and compared.The article concluded with a tapered multimode fiber coupling experiments,the highest coupling efficiency reach 90%,compared with the other mode coupling, it has a certain advantage.