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Frontiers of Optoelectronics

ISSN 2095-2759

ISSN 2095-2767(Online)

CN 10-1029/TN

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Front. Optoelectron.    2017, Vol. 10 Issue (2) : 174-179    https://doi.org/10.1007/s12200-016-0638-8
RESEARCH ARTICLE
Dynamic spot tracking system based on 2D galvanometer in free space optical communication for short distance
Qingshan JIANG1, Ciling ZENG2, Fengqiang GU3, Ming ZHAO1()
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
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Abstract

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.
Keywords free space optical communication      dynamic tracking      optical signal jitter      two-dimensional (2D) galvanometer     
Corresponding Author(s): Ming ZHAO   
Just Accepted Date: 14 September 2016   Online First Date: 17 October 2016    Issue Date: 05 July 2017
 Cite this article:   
Qingshan JIANG,Ciling ZENG,Fengqiang GU, et al. Dynamic spot tracking system based on 2D galvanometer in free space optical communication for short distance[J]. Front. Optoelectron., 2017, 10(2): 174-179.
 URL:  
https://academic.hep.com.cn/foe/EN/10.1007/s12200-016-0638-8
https://academic.hep.com.cn/foe/EN/Y2017/V10/I2/174
Fig.1  Block diagram of spot dynamic tracking system
Fig.2  Distribution of spot in I, II, III, IV quadrants received by QD
Fig.3  Adjustment of the beam
Fig.4  (a) Optical power is 0.2 mW; (b) optical power is 0.3 mW
groups x/pixel y/pixel error /pixel
before tracking after
tracking		 before tracking after
tracking		 x y
1 455.11 456.05 375.24 376.13 0.94 0.89
2 468.38 467.45 413.54 414.41 0.93 0.87
3 523.84 524.74 399.85 400.73 0.90 0.88
4 500.07 499.16 401.48 402.36 0.91 0.88
Tab.1  Comparison of spot-center before and after tracking
Fig.5  (a) Before tracking (normal); (b) missing target; (c) after tracking (back to normal)
Fig.6  Jitter suppression of this proposed system when (a) f = 100 Hz, (b) f = 1000 Hz and (c) f = 1100 Hz
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