Multiple Random Phase-Screen Simulation of Scintillation Effect of Bessel-Gaussian Beam in Ocean Turbulence

Sun, Ridong; Guo, Lixin; Cheng, Mingjian

doi:10.1109/isape.2018.8634308

Cited by 4 publications

(4 citation statements)

References 6 publications

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“…The intensity perturbation of the beam is small, but the phase perturbation is large. Furthermore, the influence of the ocean turbulence on the beam transmission can be approximated as a pure phase perturbation [11], so that the beam can pass through a series of equidistant random phase screens. To simulate the influence of ocean turbulence on beam transmission, as shown in Figure 5, the ocean turbulence model was constructed by the power spectrum inversion method, and the experimental simulation of the OAM identification under the ocean turbulence channel was carried out based on MATLAB.…”

Section: Ocean Turbulence Random Phase Screen Modelmentioning

confidence: 99%

“…Unfortunately, OAM suffers from rich information that is mainly caused by the anti-interference ability of the OAM beam and transmission interference. In a challenging situation such as in a complex and changing underwater environment, the beams interfere with the OAM during the transmission process [11][12][13][14][15], thereby increasing the difficulty of the receiver to identify the OAM, and thus, making the identification of the OAM an important process.…”

Section: Introductionmentioning

confidence: 99%

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Identification of Orbital Angular Momentum by Support Vector Machine in Ocean Turbulence

Huang

Sun

2022

JMSE

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With the advancement of underwater communication technology, the traditional modulation dimension has been introduced, developed and utilized. In addition, orbital angular momentum (OAM) is utilized as the modulation dimension for optical underwater communication to obtain larger spectrum resources. The OAM features are extracted using a histogram of oriented gradient and trained using the support vector machine method with a gradient direction histogram feature. The topological charge value of the OAM was used to identify the classification labels, and the ocean turbulence caused by different temperatures and salinity were analyzed. Experimentation results showed that the recognition accuracy for the OAM under the Laguerre–Gaussian beam rates of 1~5, 1~6, 1~7, 1~8, 1~9, and 1~10 was 98.93%, 98.89%, 97.33%, 96.66%, 95.40%, and 95.33%, respectively. The proposed method achieved a high recognition accuracy and performed efficiently under strong turbulence. Our research explored a new technique that provides a new idea for the demodulation of OAM in optical underwater communication.

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Section: Ocean Turbulence Random Phase Screen Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Identification of Orbital Angular Momentum by Support Vector Machine in Ocean Turbulence

Huang

Sun

2022

JMSE

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“…Starting from Bessel beam, zero order beam provides less scintillation comparing with higher order ones (Eyyuboglu et al 2013). Applying phase screen to underwater cases, it is obtained in (Sun et al 2018) that scintillation index of Bessel-Gaussian beam is the lowest when operating wavelength is 550 nm. Using the scintillation index, the propagation properties of laser beams through maritime atmospheric turbulence have been widely investigated by (Khannous et al 2014;Khannous and Belafhal 2016a, b;Boufalah et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of performance of mirrored Bessel beam in turbulence

Bayraktar

Chib

Belafhal

2023

Preprint

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We study scintillation and bit error rate performance of mirrored Bessel beams through turbulent atmosphere in this article. We benefit from numerical method to model the atmosphere. Since scintillation plays a vital role in optical wireless applications, reduction in this term provides better performance in these systems. Bearing in mind this, our results indicate that it is possible to decrease scintillation by increasing beam order to three when strong turbulent conditions are satisfied. In addition, we observe that argument of Bessel beam has more dominant role than beam order in moderate turbulence. Lastly, mirroring brings us a slight advantage in case of bit error rate. Results of this study can be beneficial for optical link designers.

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“…The spiral wavefront phase of the vortex beam is susceptible to turbulence, resulting in pattern dispersion and intensity distortion, which in turn leads to the distortion of interference or diffraction fringes. With the increase in turbulence intensity and transmission distance, the distortion of the interference of light intensity distribution becomes more and more serious [ 15 , 16 , 17 , 18 ]. This increases the difficulty of OAM pattern recognition.…”

Section: Introductionmentioning

confidence: 99%

Research on Orbital Angular Momentum Recognition Technology Based on a Convolutional Neural Network

Sun

Huang

et al. 2023

Sensors

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In underwater wireless optical communication (UWOC), a vortex beam carrying orbital angular momentum has a spatial spiral phase distribution, which provides spatial freedom for UWOC and, as a new information modulation dimension resource, it can greatly improve channel capacity and spectral efficiency. In a case of the disturbance of a vortex beam by ocean turbulence, where a Laguerre–Gaussian (LG) beam carrying orbital angular momentum (OAM) is damaged by turbulence and distortion, which affects OAM pattern recognition, and the phase feature of the phase map not only has spiral wavefront but also phase singularity feature, the convolutional neural network (CNN) model can effectively extract the information of the distorted OAM phase map to realize the recognition of dual-mode OAM and single-mode OAM. The phase map of the Laguerre–Gaussian beam passing through ocean turbulence was used as a dataset to simulate and analyze the OAM recognition effect during turbulence caused by different temperature ratios and salinity. The results showed that, during strong turbulence Cn2=1.0×10−13K2m−2/3, when different ω = −1.75, the recognition rate of dual-mode OAM (ℓ = ±1~±5, ±1~±6, ±1~±7, ±1~±8, ±1~±9, ±1~±10) had higher recognition rates of 100%, 100%, 100%, 100%, 98.89%, and 98.67% and single-mode OAM (ℓ = 1~5, 1~6, 1~7, 1~8, 1~9, 1~10) had higher recognition rates of 93.33%, 92.77%, 92.33%, 90%, 87.78%, and 84%, respectively. With the increase in ω, the recognition accuracy of the CNN model will gradually decrease, and in a fixed case, the dual-mode OAM has stronger anti-interference ability than single-mode OAM. These results may provide a reference for optical communication technologies that implement high-capacity OAM.

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Multiple Random Phase-Screen Simulation of Scintillation Effect of Bessel-Gaussian Beam in Ocean Turbulence

Cited by 4 publications

References 6 publications

Identification of Orbital Angular Momentum by Support Vector Machine in Ocean Turbulence

Identification of Orbital Angular Momentum by Support Vector Machine in Ocean Turbulence

Numerical investigation of performance of mirrored Bessel beam in turbulence

Research on Orbital Angular Momentum Recognition Technology Based on a Convolutional Neural Network

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