Experimental Study on the Correction of Wavefront Distortion for Vortex Beam

Xizheng, 柯熙政 Ke; Xiayao, 王夏尧 Wang

doi:10.3788/aos201838.0328018

Cited by 7 publications

(2 citation statements)

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“…After receiving information from the far-field beam, the detector supplies the SPGD controller with the value of the metric function in real time. Then, the SPGD controller executes the SPGD algorithm and generate the control voltage to the PM The intensity correlation coefficient is applied to the metric function, and the cross-grouping method is used to ensure fast convergence of the metric function J in the SPGD correction [15] . The figure 3 shows the cross-grouping division method, and each sub-array contains j sub-beams.…”

Section: Spgd Correction Modelmentioning

confidence: 99%

Optimization for coherent combined vortex fiber array with phase correction

Qin

Quan

2023

Eighth International Conference on Electronic Technology and Information Science (ICETIS 2023)

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The main factors limiting the long-distance application of vortex beam are the low receiving power and the wavefront phase distortion caused by atmosphere turbulence. Coherent beam combining (CBC) technology is an effective way to generating high power vortex beams. However, most common coherent combined vortex (CCV) fiber array is currently based on a single-ring structure with limited output power enhancement. In this paper, a dual-ring fiber array is developed to achieve higher output power and improved stochastic-parallel-gradient-descent (SPGD) correction accuracy. To improve SPGD correction speed, cross-grouping method is used. The results show that CCV beam in dual-ring structure can maintain good intensity distribution and mode distribution after SPGD correction.

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Section: Spgd Correction Modelmentioning

confidence: 99%

Optimization for coherent combined vortex fiber array with phase correction

Qin

Quan

2023

Eighth International Conference on Electronic Technology and Information Science (ICETIS 2023)

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“…Much work is devoted to compensating the phase of the aberrated vortex beams to realize the restoration of turbulence-degraded images. The commonly used methods are sensor-less adaptive optics (AO) techniques [6] , including Gerchberg-Saxton(GS) algorithm [7,8], stochastic parallel gradient descent (SPGD) algorithm [9,10], and genetic algorithm [11] . GS algorithm and SPGD algorithm need several iterations and are easy to fall into local extremums.…”

Section: Introductionmentioning

confidence: 99%

Degraded image restoration of vortex beam array based on deep learning

Zhao,

Wei,

et al. 2024

Phys. Scr.

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The phase aberration and intensity fluctuation of the vortex beam array caused by atmospheric turbulence decrease the decoding accuracy of the optical communication system. This paper proposes an end-to-end turbulence-degraded image restoration method based on deep learning to solve the problem. The K-means clustering algorithm is employed to obtain the coordinate information of each beam in the array, and the distorted vortex beam array is segmented. The neural network constructed is used to restore the degraded image of a single vortex beam obtained by segmentation. Then the restored intensity image of the vortex beam array is obtained by combining the existing coordinate information. The simulation results show that the intensity correlation coefficients of the 3 × 3 rectangular distribution Laguerre–Gaussian beam arrays are increased to more than 0.99 after restoring from 1000 meters of transmission in both varied and unknown turbulence intensities, alongside differing CCD signal-to-noise ratios. This method does not require wavefront reconstruction, which further improves the restoration speed and saves computational resources, and has good generalization ability and robustness in quickly restoring the distorted light intensity of vortex beams. The results provide a theoretical basis for studying atmospheric turbulence influence mitigation techniques for vortex optical communication.

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Adaptive Optics Technology

2024

Handbook of Optical Wireless Communication

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Experimental Study on the Correction of Wavefront Distortion for Vortex Beam

Cited by 7 publications

References 0 publications

Optimization for coherent combined vortex fiber array with phase correction

Optimization for coherent combined vortex fiber array with phase correction

Degraded image restoration of vortex beam array based on deep learning

Adaptive Optics Technology

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