Experimental demonstration of single-mode fiber coupling using adaptive fiber coupler

doi:10.1088/1674-1056/23/1/014207

Chin. Phys. B ›› 2014, Vol. 23 ›› Issue (1): 14207-014207.doi: 10.1088/1674-1056/23/1/014207

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Experimental demonstration of single-mode fiber coupling using adaptive fiber coupler

罗文^{a b c}, 耿超^{a b}, 武云云^{a b c}, 谭毅^{a b c}, 罗奇^{a b c}, 刘红梅^{a b c}, 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

收稿日期:2013-05-21 修回日期:2013-06-20 出版日期:2013-11-12 发布日期:2013-11-12
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 61205069).

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

Received:2013-05-21 Revised:2013-06-20 Online:2013-11-12 Published:2013-11-12
Contact: Li Xin-Yang E-mail:xyli@ioe.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 61205069).

摘要/Abstract

摘要： 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%.

关键词: single-mode fiber coupling, adaptive fiber coupler, adaptive optics, free-space optical communication

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%.

Key words: single-mode fiber coupling, adaptive fiber coupler, adaptive optics, free-space optical communication

中图分类号: (Fiber waveguides, couplers, and arrays)

42.81.Qb

42.60.Lh (Efficiency, stability, gain, and other operational parameters) 42.81.Wg (Other fiber-optical devices) 42.90.+m (Other topics in optics)

罗文, 耿超, 武云云, 谭毅, 罗奇, 刘红梅, 李新阳. Experimental demonstration of single-mode fiber coupling using adaptive fiber coupler[J]. Chin. Phys. B, 2014, 23(1): 14207-014207.

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[J]. Chin. Phys. B, 2014, 23(1): 14207-014207.

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Experimental demonstration of single-mode fiber coupling using adaptive fiber coupler

Experimental demonstration of single-mode fiber coupling using adaptive fiber coupler

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