Application of phase‑conjugate beams in beam correction and underwater optical wireless communication subject to surface wave turbulence  

作　　者：Qi Li Xiuhua Yuan Feng Zhou Zeyu Zhou Wujie Liu 

机构地区：[1]School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,China [2]Key Laboratory of Hunan Province On Information Photonics and Freespace Optical Communications,School of Information Science and Engineering,Hunan Institute of Science and Technology,Yueyang 414006,China

出　　处：《Frontiers of Optoelectronics》2022年第3期87-96,共10页光电子前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.62005088);Foundation for Young Scientists of the Education Ministry of China(No.18B352);Hunan Provincial Natural Science Foundation of China(No.2020JJ4331);the project supported by the Science and Technology Program of Hunan Province,China(No.2019TP1014).

摘　　要：Water surface wave turbulence is one of the factors afecting the performances of underwater optical wireless communication(UOWC)systems.In our research,a phase-conjugate beam was used to correct the beam distortion and enhance the communication performances when a system is subject to surface wave turbulence.The phase-conjugate beam was generated by a phase-conjugate mirror(PCM),and a turbulence generator was used to generate surface wave turbulence in the experiment.We calculated the beam centroid distribution and the results showed that the phase-conjugate beam had a better propagation performance than the distorted beam at the diferent water depths.The root mean square(RMS)of the beam centroid for the phase-conjugate beam was 11 times less than that for the distorted beam,which meant that the phase-conjugate beam could efectively correct the beam drift.We further investigated the scintillation index and the signal-to-noise ratio(SNR);the results showed that the phase-conjugate beam was able to reduce the scintillation and an obvious improvement in SNR could be obtained.This research has the potential to be applied in UWC.

关 键 词：Phase-conjugate beam Underwater optical wireless communication(UOWC) Degenerate four-wave mixing(DFWM) Surface wave turbulence 

分 类 号：TN92[电子电信—通信与信息系统]