Dynamic spot tracking system based on 2D galvanometer in free space optical communication for short distance  

作　　者：Qingshan JIANG Ciling ZENG Fengqiang GU Ming ZHAO 

机构地区：[1]School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China [2]State Grid Hunan Electric Power Company, Changsha 410007, China [3]Beijing Kedong Power Control System Co Ltd, Beijing 100192, China

出　　处：《Frontiers of Optoelectronics》2017年第2期174-179,共6页光电子前沿（英文版）

基　　金：This work wassupported by the National Natural Science Foundation of China （Grant Nos. 61475058 and 11104094）, Wuhan Science And Technology Proj ect （No. 2015010101010001 ）, Shenzhen Basic Research Project （No. JCYJ20140419131733980）, and the Open Fund of TheState Key Laboratory of High Performance Complex Manufacturing （No Kfkt2013-07）.

摘　　要：Dynamic tracking of laser spot is a key process in the establishment of free space optical communication. In this paper, a dynamic tracking system was presented. In this system, a two-dimensional （2D） galvanometer was used to change the angle of the optical axis of the incident beam at a certain scanning frequency as optical signal jitter simulator, and another galvanometer was used to track the jitter with quadrant detector （QD） and data processing module to acquire the position information of laser spot. Results indicated that the tracking accuracy of this system mainly composed of 2D galvanometer was as high as 27,8 ~rad, and its linear deviation was less than 0.013. The system could still keep the dynamic tracking of the spot stable when the jitter frequency of the optical signal was less than 1000 Hz. Those results suggested that this system could be suitable for the short distance in free space communication due to its simple structure, easy to control and low cost compared with conventional system.Dynamic tracking of laser spot is a key process in the establishment of free space optical communication. In this paper, a dynamic tracking system was presented. In this system, a two-dimensional （2D） galvanometer was used to change the angle of the optical axis of the incident beam at a certain scanning frequency as optical signal jitter simulator, and another galvanometer was used to track the jitter with quadrant detector （QD） and data processing module to acquire the position information of laser spot. Results indicated that the tracking accuracy of this system mainly composed of 2D galvanometer was as high as 27,8 ~rad, and its linear deviation was less than 0.013. The system could still keep the dynamic tracking of the spot stable when the jitter frequency of the optical signal was less than 1000 Hz. Those results suggested that this system could be suitable for the short distance in free space communication due to its simple structure, easy to control and low cost compared with conventional system.

关 键 词：free space optical communication dynamictracking optical signal jitter two-dimensional （2D） galvan-ometer 

分 类 号：TN[电子电信]