Li Ming,Lin Song,Li Shu-ming,Yang Shao-wen.Suppression of fluctuation on the angle of arrival for freespace optical communication[J].Optoelectronics Letters,2012,8(4):297-300 Suppression of fluctuation on the angle of arrival for freespace optical communication Author Name Affiliation Li Ming  College of Educational Information &Technology, Hubei Normal University, Huangshi 435002, China；College of Physics & Electronic Information Engineering, Hubei Engineering University, Xiaogan 432000, China；School of Electronic Information, Wuhan University, Wuhan 430079, China  Lin Song  College of Educational Information &Technology, Hubei Normal University, Huangshi 435002, China  Li Shu-ming  College of Educational Information &Technology, Hubei Normal University, Huangshi 435002, China  Yang Shao-wen  College of Educational Information &Technology, Hubei Normal University, Huangshi 435002, China  Abstract:       In order to increase the coupling efficiency and suppress the random angular jitter induced by atmosphere turbulent, the fine tracking system with fast steering mirror (FSM) is demonstrated. The field experiment results of free-space optical communication link across 16 km show that when there is no tracking, the range of the x-axis coordinates’ fluctuation achieves 46 pixels, corresponding to the incident angle of 73.6 μrad, and its mean square deviation is 6.5 pixels, corresponding to the incident angle of 10.4 μrad. When there is tracking, the range of fluctuation is suppressed to 10 pixels and 16 μrad, and the mean square deviation reduces to 1.5 pixels and 2.6 μrad for the spot’s centroid and the incident angle, respectively. Significantly, the coupling efficiency increases by 6 times, and the fluctuation of received light power decreases obviously. Hits: 4185 Download times: 426 This work has been supported by the Hubei Provincial Department of Education Grant (Nos.CXY2009B032 and D20102506). View Full Text    Download reader