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Department自适应光学技术研究室(八室)
Control Bandwidth Promotion of Adaptive Fiber-Optics Collimator and Its Application in Coherent Beam Combination
Huang, Guan1,2,3; Geng, Chao1,2; Li, Feng1,2; Liu, Jiaying1,2,3; Li, Xinyang1,2
Source PublicationIEEE PHOTONICS JOURNAL
Volume10Issue:6Pages:7105513
2018-12-01
Language英语
ISSN1943-0655
DOI10.1109/JPHOT.2018.2876136
Indexed BySCI ; Ei
WOS IDWOS:000449084900001
EI Accession Number20184406021791
SubtypeJ
AbstractAdaptive fiber-optics collimator (AFOC) plays an important role in the coherent beam combining (CBC) systems. To improve the control bandwidth, the frequency characteristics of AFOC are measured, and an accurate transfer function model is established. Through the analysis of this model, we find that the resonance and the inherent response delay are the main limiting factors. To solve these two problems, an active resonance suppression method based on biquad filters and an improved control algorithm named precise-delayed stochastic parallel gradient descent (PD-SPGD) is proposed. The resonance suppression experiment shows that when the frequency is within 10 kHz, the fluctuation in the AFOC's amplitude-frequency characteristic is suppressed within +/- 3 dB by the biquad filters, and the phase-frequency characteristic is compensated to be similar to a pure delay element (with inherent response delay of about 88 mu s). The two-channel CBC experiment shows that the algorithm's iteration rate increased from 1.6 to 6 kHz and the convergence time decreased from 5.63 to 1.83 ms when the biquad filters and PD-SPGD are used together, which indicate that the AFOC's actual control bandwidth is about 3.1 times higher than before.
KeywordCoherent beam combining adaptive fiber-optics collimator biquad filters precise-delayed SPGD algorithm
WOS KeywordMIRROR ; TILT ; TIP
EI KeywordsAdaptive optics ; Bandwidth ; Fiber amplifiers ; Fiber optics ; Gradient methods ; Laser beams ; Natural frequencies ; Optical fibers ; Stochastic systems
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ioe.ac.cn/handle/181551/9284
Collection自适应光学技术研究室(八室)
Affiliation1.Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu; 610209, China;
2.Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu; 610209, China;
3.University of Chinese Academy of Sciences, Beijing; 100049, China
Recommended Citation
GB/T 7714
Huang, Guan,Geng, Chao,Li, Feng,et al. Control Bandwidth Promotion of Adaptive Fiber-Optics Collimator and Its Application in Coherent Beam Combination[J]. IEEE PHOTONICS JOURNAL,2018,10(6):7105513.
APA Huang, Guan,Geng, Chao,Li, Feng,Liu, Jiaying,&Li, Xinyang.(2018).Control Bandwidth Promotion of Adaptive Fiber-Optics Collimator and Its Application in Coherent Beam Combination.IEEE PHOTONICS JOURNAL,10(6),7105513.
MLA Huang, Guan,et al."Control Bandwidth Promotion of Adaptive Fiber-Optics Collimator and Its Application in Coherent Beam Combination".IEEE PHOTONICS JOURNAL 10.6(2018):7105513.
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