Dynamic spot tracking system based on 2D galvanometer in free space optical communication for short distance
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 μrad, 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.
Keywordsfree space optical communication dynamic tracking optical signal jitter two-dimensional (2D) galvanometer
Unable to display preview. Download preview PDF.
This work wassupported by the National Natural Science Foundation of China (Grant Nos. 61475058 and 11104094), Wuhan Science And Technology Project (No. 2015010101010001), Shenzhen Basic Research Project (No. JCYJ20140419131733980), and the Open Fund of The State Key Laboratory of High Performance Complex Manufacturing (No. Kfkt2013-07).
- 2.Zhang Z. Spot position detection technology based on QD. Changchun: Changchun University of Science and Technology,2014, 21–22Google Scholar
- 3.Yue B, Yang W, Fu C. Experiments on precision tracking system with a fast steering mirror in space laser communication. Opto- Electronic Engineering, 2002, 29(3): 35–37Google Scholar
- 4.Li M, Ai Y, Cao Y. Research of fine tracking servo system for FSO terminal. Laser Technology, 2009, 33(3): 262–265Google Scholar
- 5.Shao B, Sun L, Qu D, Wang J, Qin C. Research on the key technology of ATP system for free space optical communication. Piezoelectrics & Acoustooptics, 2005, 27(4): 431–433Google Scholar
- 6.Dong R, Ai Y, Xiao Y, Shan X. Design and communication experiment of fine tracking system for free space optic. Hongwai Yu Jiguang Gongcheng, 2012, 41(10): 2718–2722Google Scholar
- 7.Zhou H, Ai Y, Shan X, Dai Y. Identification of fine tracking system for free space optical communications. Hongwai Yu Jiguang Gongcheng, 2015, 44(2): 736–740Google Scholar
- 8.Xu L. The design of scanning control system based on 2D laser galvanometer. Changchun: Changchun University of Science and Technology,2012, 13–15Google Scholar
- 9.Lu J. Research of on the determination of the spot position of the four quadrant detector. Technology Trend, 2009, 10(1): 222–224 (in Chinese)Google Scholar
- 10.Wei L. The reaserch and realization of APT system for laser space communication system. Wuhan: Huazhong University of Science and Technology,2010, 39–44Google Scholar
- 12.Wang L. Technology research on fine tracking in space laser communication system. Optical Communication Technology, 2014, 3: doi:10.13921/j.cnki.issn1002-5561.2014.03.017Google Scholar
- 13.Ke Y. Measurement system design and experimental research with high accuracy for laser beam quality. Wuhan: Huazhong University of Science and Technology,2015, 16–18Google Scholar