DOI QR코드

DOI QR Code

Experimental Study of Large-amplitude Wavefront Correction in Free-space Coherent Optical Communication

  • Guo, Qian (School of Mechanical and Electrical Engineering, Xi'an Polytechnic University) ;
  • Cheng, Shuang (Faculty of Automation and Information Engineering, Xi'an University of Technology) ;
  • Ke, Xizheng (Faculty of Automation and Information Engineering, Xi'an University of Technology)
  • 투고 : 2021.07.15
  • 심사 : 2021.10.12
  • 발행 : 2021.12.25

초록

In a free-space coherent optical communication system, wavefront distortion is frequently beyond the correction range of the adaptive-optics system after the laser has propagated through the atmospheric turbulence. A method of residual wavefront correction is proposed, to improve the quality of coherent optical communication in free space. The relationship between the wavefront phase expanded by Zernike polynomials and the mixing efficiency is derived analytically. The influence of Zernike-polynomial distortion on the bit-error rate (BER) of a phase-modulation system is analyzed. From the theoretical analysis, the BER of the system changes periodically, due to the periodic extension of wavefront distortion. Experimental results show that the BER after correction is reduced from 10-1 to 10-4; however, when the closed-loop control algorithm with residual correction is used, the experimental results show that the BER is reduced from 10-1 to 10-7.

키워드

과제정보

The authors declare that there is no conflict of interest regarding the publication of this paper. This work was supported by the Key industry innovation chain project of Shaanxi Province (grant number: 2017ZDCXL-GY-06-01), and the Xi'an Key Laboratory of Modern Intelligent Textile Equipment (grant number: 2019220614SYS021CG043). This work was also supported by the Scientific research project of the Shaanxi Provincial Department of Education (grant number: 18JK0341), and by the Xi'an Science and technology innovation guidance project (grant number: 201805030YD8CG14 (12)).

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