Optimization of underwater optical transmission based on Hadamard encoding algorithm

ZHANG Feng; LI Bo-xiao; TIAN Lei; NIE Jie-wen; YANG Hai-ning

doi:10.37188/CJLCD.2022-0144

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Optimization of underwater optical transmission based on Hadamard encoding algorithm

Image Processing | 更新时间：2022-10-28

- Optimization of underwater optical transmission based on Hadamard encoding algorithm
- Chinese Journal of Liquid Crystals and Displays Vol. 37, Issue 11, Pages: 1453-1458(2022)
- 作者机构：
  
  1.中国电力科学研究院，北京 100041
  2.清华大学电子工程系，北京 100084
  3.东南大学电子科学与工程学院，江苏南京 210096
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(62105059);Supported by Natural Science Foundation of Jiangsu Province(BK20200351)
- DOI：10.37188/CJLCD.2022-0144
  CLC： TP391
- Received：24 April 2022，
  
  Revised：06 May 2022，
  
  Published：05 November 2022
- 稿件说明：
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ZHANG Feng, LI Bo-xiao, TIAN Lei, et al. Optimization of underwater optical transmission based on Hadamard encoding algorithm[J]. Chinese journal of liquid crystals and displays, 2022, 37(11): 1453-1458.
DOI：

ZHANG Feng, LI Bo-xiao, TIAN Lei, et al. Optimization of underwater optical transmission based on Hadamard encoding algorithm[J]. Chinese journal of liquid crystals and displays, 2022, 37(11): 1453-1458. DOI： 10.37188/CJLCD.2022-0144.

摘要

水下无线光传输以蓝绿激光为载体，传输速度快，实时性强，在海洋勘探、海洋通信等方面起着非常重要的作用。然而光束自身的发散及其受水吸收和散射作用影响，导致传输过程中能量损失，接收端信号微弱。为了提高光束在水中的传输效率，本文提出了一种基于哈达玛基编码算法的光束整形模块，通过空间光调制器对波前相位进行调制，将光束分为参考光束和调制光束，并通过四步相移计算两种光的相位角，在多次变换中寻找最优全息图，聚焦接收端处的光束，减小光能经过水下信道后的损失。该研究成果有效地提升了不同距离下接收端的能量，实验结果显示，调制越精细，光束聚焦效果越好，达到了15 m处接收端中心能量2.3倍的提升。

Abstract

Underwater wireless optical transmission adopts blue-green laser with the advantage of fast and real-time， playing an important role in ocean exploration and communication. However， the divergence of the beam itself is affected by the absorption and scattering of water， resulting in energy loss and weak signal at the receiving end. As a result， a beam shaping module based on Hadamard encoding algorithm is proposed in this paper to improve the transmission efficiency of beam in water. The wavefront phase of incident beam is modulated by liquid crystal on silicon to find the optimal hologram in multiple iterative process and reduce the loss of light energy after passing through the underwater channel. The beam is divided into reference beam and modulation beam and the angle of the two beams can be calculated by four-step phase shift. The results show that the energy of the receiver at different distances can be improved， reaching a 2.3 times increase in the energy of the receiver at 15 m. The finer the beam is modulted， the better it focuses.

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references

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