Xiong Zhun, Ai Yong, Shan Xin, Chen Jing, Chen Erhu, Zhao Heng, Wu Yunyun. Fiber coupling efficiency and compensation analysis for free space optical communication[J]. Infrared and Laser Engineering, 2013, 42(9): 2510-2514.
Citation:
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Xiong Zhun, Ai Yong, Shan Xin, Chen Jing, Chen Erhu, Zhao Heng, Wu Yunyun. Fiber coupling efficiency and compensation analysis for free space optical communication[J]. Infrared and Laser Engineering, 2013, 42(9): 2510-2514.
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Fiber coupling efficiency and compensation analysis for free space optical communication
- 1.
School of Electronic Information,Wuhan University,Wuhan 430079,China;
- 2.
Institute of Beijing Tracking and Communication Technology,Beijing 100094,China;
- 3.
The Key Laboratory of Adaptive Optics,Chinese Academy of Sciences,Chengdu 610209,China
- Received Date: 2013-01-11
- Rev Recd Date:
2013-02-14
- Publish Date:
2013-09-25
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Abstract
The coupling efficiency of received optical power into a single-mode fiber is degraded by atmospheric turbulence in a free space optical communication system. The expression of average coupling efficiency of a collimated Gaussian beam into a single-mode fiber was derived under Kolmogorov turbulence channel, according to the theory of weak turbulence statistics. The relations between average coupling efficiency and turbulence intensity under different received aperture in 1 km propagation path were also simulated. The results show that coupling efficiency decreases below 0.1 when refractive-index structure constant rises to 10-12, and coupling efficiency degrades when the received aperture increases. A 37-element adaptive optics system with H-S wavefront sensor was adopted to compensate the efficiency. Compared with long exposure imaging and centroid position offset in different status of AO system, it was found that the P-V value and standard deviation decreased, Strehl ratio and coupling efficiency increased in low-order aberration correction. And things became better when high-order aberration was corrected.
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Proportional views
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