Laser & Optoelectronics Progress, Volume. 60, Issue 9, 0901001(2023)
Orbital Angular Momentum in a Superposition State for High-Dimensional Modulation and Demodulation in Underwater Optical Communication
Fig. 1. Steps of identifying superposition states of two different LG modes by measuring light intensity distribution. Three boxes in the first row represent characteristics of light intensity distribution used, and three boxes on right of the second row represent information obtained at each step
Fig. 2. Experimental device diagram of vortex beam's superposition state transmitted in water channel
Fig. 3. Processing of experimental images. (a) LG superposition state's light intensity distribution diagram whose background light noise is filtered ;(b) binarization result which is used to identify number and region of petals; (c) maximum extraction and Pratt method circle fitting[27]
Fig. 4. Evaluation function values in different combinations of
Fig. 5. Light intensity diagram of vortex beam's superposition states transmitted through a water channel
Fig. 6. Theoretical diagrams and experimental results of light intensity distribution
Fig. 7. Recognition results of superposition states of 16 vortex beams. (a) Minimum value of evaluation function
Fig. 8. Experimental results of different combined topological charges under different salinities. (a), (b), (c), and (d) respectively represent minimum value of evaluation function
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Haida Liu, Xiaobing Hei, Yang Yang, Yuanhao Xie, Lei Gai, Yongjian Gu, Ya Xiao, Wendong Li. Orbital Angular Momentum in a Superposition State for High-Dimensional Modulation and Demodulation in Underwater Optical Communication[J]. Laser & Optoelectronics Progress, 2023, 60(9): 0901001
Category: Atmospheric Optics and Oceanic Optics
Received: Mar. 10, 2022
Accepted: Apr. 14, 2022
Published Online: Apr. 24, 2023
The Author Email: Li Wendong (liwd@ouc.edu.cn)