Abstract
Partially coherent optical vortices have been applicated widely to reduce the influence of atmospheric turbulence, especially for free-space optical (FSO) communication. Furthermore, the beam array is an effective way to increase the power of the light source, and can increase the propagation distance of the FSO communication system. Herein, we innovatively report evolution properties of the radial phased-locked partially coherent vortex (RPLPCV) beam array in non-Kolmogorov turbulence. The analytical expressions for the cross-spectral density and the average intensity of an RPLPCV beam array propagated through non-Kolmogorov turbulence are obtained. The numerical results reveal that the intensity distribution of the RPLPCV array propagated in the non-Kolmogorov turbulence is gradually converted to a standard Gaussian distribution. In addition, the larger the radial radius, radial number and waist radius are, the smaller the coherence length is. Moreover, the longer the wavelength is, the shorter the propagation distance required for the intensity distribution of the RPLPCV beam array to be converted into a Gaussian distribution in the non-Kolmogorov turbulence. The research in this paper provides a theoretical reference for the selection of light sources and the suppression of turbulence effects in wireless optical communication.
Highlights
During the past several decades, emerged insight into practical applications of freespace optical (FSO) communications [1,2,3] and quantum information [4,5] has culminated in the concept of the vortex beams [6]
We numerically study the effects of the array parameters, single source parameters and atmospheric turbulence parameters on the intensity distributions of the radial phased-locked partially coherent vortex (RPLPCV) beam array propagating through non-Kolmogorov turbulence
This is because the larger the radial radius is, the more the RPLPCV beam array is affected by non-Kolmogorov turbulence
Summary
During the past several decades, emerged insight into practical applications of freespace optical (FSO) communications [1,2,3] and quantum information [4,5] has culminated in the concept of the vortex beams [6]. In FSO communication systems, in addition to beam combining technology (BCT) [11] to increase the output of high-power lasers, using partially coherent vortex beams as carriers is an effective way to increase the transmission distance and reduce atmospheric turbulence effects. Combining the BCT and the inherent properties of partially coherent vortex beams, studying the propagation characteristics of the radial phased-locked partially coherent vortex beam array in non-Kolmogorov turbulence has a certain theoretical basis and technical support for the field of information transmission. Liu et al [28] discussed the properties of spreading of a radial phased-locked partially coherent flat-topped vortex beam array propagating through non-Kolmogorov medium. To the best of our knowledge, less work has been reported regarding the evolution properties of the radial phased-locked partially coherent vortex beam array in non-Kolmogorov turbulence. It is believed that the results will benefit the study of fourth-order moment properties of RPLPCV beam arrays
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