| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Experimental demonstration of single-mode fiber coupling using adaptive fiber coupler |
| Luo Wen (罗文)a b c, Geng Chao (耿超)a b, Wu Yun-Yun (武云云)a b c, Tan Yi (谭毅)a b c, Luo Qi (罗奇)a b c, Liu Hong-Mei (刘红梅)a b c, Li Xin-Yang (李新阳)a b |
a Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China;
b Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China;
c University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Coupling plane wave into a single-mode fiber (SMF) with high and steady coupling efficiency is crucial for fiber-based free-space laser systems, where random angular jitters are the main influencing factors of fiber coupling. In this paper, we verified a new adaptive-optic device named adaptive fiber coupler (AFC) which could compensate angular jitters and improve the SMF coupling efficiency in some degree. Experiments of SMF coupling under the angular jitter situation using AFC have been achieved. Stochastic parallel gradient descent (SPGD) algorithm is employed as the control strategy, of which the iteration rate is 625 Hz. In closed loop, the coupling efficiency keeps above 65% when angular errors are below 80 μrad. The compensation bandwidth is 35 Hz at sine-jitter of 15 μrad amplitude with average coupling efficiency of above 60%. Also, experiments with simulated turbulence have been studied. The average coupling efficiency increases from 31.97% in open loop to 61.33% in closed loop, and mean square error (MSE) of coupling efficiency drops from 7.43% to 1.75%.
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Received: 21 May 2013
Revised: 20 June 2013
Accepted manuscript online:
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PACS:
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42.81.Qb
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(Fiber waveguides, couplers, and arrays)
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42.60.Lh
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(Efficiency, stability, gain, and other operational parameters)
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42.81.Wg
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(Other fiber-optical devices)
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42.90.+m
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(Other topics in optics)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61205069). |
Corresponding Authors:
Li Xin-Yang
E-mail: xyli@ioe.ac.cn
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Cite this article:
Luo Wen (罗文), Geng Chao (耿超), Wu Yun-Yun (武云云), Tan Yi (谭毅), Luo Qi (罗奇), Liu Hong-Mei (刘红梅), Li Xin-Yang (李新阳) Experimental demonstration of single-mode fiber coupling using adaptive fiber coupler 2014 Chin. Phys. B 23 014207
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