Zhaokun Li
Jilin University
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Publication
Featured researches published by Zhaokun Li.
Journal of The Optical Society of Korea | 2015
Zhaokun Li; Xiaohui Zhao; Jingtai Cao; Wei Liu
In this study, a novel parallel wavefront correction system architecture is proposed, and a model-based tabu search (MBTS) algorithm is introduced for this new system to compensate wavefront aberration caused by atmospheric turbulence in a free-space optical (FSO) communication system. The algorithm flowchart is presented, and a simple hypothetical design for the parallel correction system with multiple adaptive optical (AO) subsystems is given. The simulated performance of MBTS for an AO-FSO system is analyzed. The results indicate that the proposed algorithm offers better performance in wavefront aberration compensation, coupling efficiency, and convergence speed than a stochastic parallel gradient descent (SPGD) algorithm.
Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part I | 2015
Zhaokun Li; Jingtai Cao; Wei Liu; Jianfeng Feng; Xiaohui Zhao
We use conventional adaptive optical system to compensate atmospheric turbulence in free space optical (FSO) communication system under strong scintillation circumstances, undesired wave-front measurements based on Shark-Hartman sensor (SH). Since wavefront sensor-less adaptive optics is a feasible option, we propose several swarm intelligence algorithms to compensate the wavefront aberration from atmospheric interference in FSO and mainly discuss the algorithm principle, basic flows, and simulation result. The numerical simulation experiment and result analysis show that compared with SPGD algorithm, the proposed algorithms can effectively restrain wavefront aberration, and improve convergence rate of the algorithms and the coupling efficiency of receiver in large extent.
Journal of the Korean Physical Society | 2017
Dong Hee Shin; Jin Hyuck Heo; Sang Hyuk Im; Rena Lee; Kyubo Kim; Samju Cho; Sangwook Lim; Suk Lee; Jang Bo Shim; Hyun Do Huh; Sang Hoon Lee; Sohyun Ahn; Ashadun Nobi; Jae Woo Lee; Hyunwoo Lim; Hunwoo Lee; Hyosung Cho; Changwoo Seo; Uikyu Je; Chulkyu Park; Kyuseok Kim; Guna Kim; Soyoung Park; Dongyeon Lee; Seokyoon Kang; Minsik Lee; Jingtai Cao; Xiaohui Zhao; Zhaokun Li; Wei Liu
Regrettably, due to a technical error during the production process, there were discrepancies in DOI of the mentioned articles between HTML and PDF files. The DOIs are correct in the PDF files but were incorrect in HTML. The original articles have been corrected. The Publisher apologizes for any inconvenience and confusion caused.
Journal of The Optical Society of Korea | 2016
Zhaokun Li; Xiaohui Zhao
There is no doubt that adaptive optics (AO) is the most promising method to compensate wavefront disturbance in free space optics communication (FSO). In order to improve the performance of the AO system described by discrete-time linear system model with time-delay and implicit phase turbulent model, new controllers based on a Kalman filter and its extensions are proposed. Based on the standard Kalman filter, we propose a fading memory filter to deal with the ruleless strong interference; sequential and U-D filters are applied to reduce implementation complexity for the embedded controllers. Theoretical analysis and the numerical simulations show that the proposed fading memory filter can upgrade the performance for AO systems in consideration of the unforeseen strong pulse interference, and the sequential and U-D filters perform well compared with a Kalman filter.
Optics Communications | 2015
Zhaokun Li; Jingtai Cao; Xiaohui Zhao; Wei Liu
Optics and Laser Technology | 2015
Zhaokun Li; Jingtai Cao; Xiaohui Zhao; Wei Liu
Optik | 2014
Jingtai Cao; Xiaohui Zhao; Zhaokun Li; Wei Liu; Yang Song
Optics Communications | 2014
Zhaokun Li; Jingtai Cao; Xiaohui Zhao; Wei Liu
Optics Communications | 2017
Zhaokun Li; Xiaohui Zhao
Optik | 2015
Yaowen Lv; Jinliang Feng; Zhaokun Li; Wei Liu; Jingtai Cao