Optimizing fibers coupling efficiency in the turbulent atmosphere by using a focusing lens system

Qin, Yi; Yang, Huajun; Jiang, Ping; Caiyang, Weinan; Zhou, Miaofang; Zheng, Yifan

doi:10.1016/j.ijleo.2022.170286

Cited by 5 publications

(2 citation statements)

References 18 publications

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“…[24] Moreover, there are focused annular vortex beams, [25] focused Bessel beams, [26] and other focused vortex beams that have high tolerance to turbulent interference and potentially other properties. [27] Compared to transport media such as atmospheric turbulence, oceanic turbulence is more complex and has a greater impact on the vortex beams passing through it. We anticipate that the performance of an LG beam with focusing mirror resisting for turbulence will have great potential applications in underwater wireless optical communication.…”

Section: Introductionmentioning

confidence: 99%

Properties of focused Laguerre–Gaussian beam propagating in anisotropic ocean turbulence

Wang 王,

Ma 马,

Yuan 袁

et al. 2024

Chinese Phys. B

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In this paper, we analysis the properties of focused Laguerre-Gaussian (LG) beam propagating through anisotropic ocean turbulence based on the Huygens-Fresnel principle. Under the Rytov approximation theory, we derive the analytical formula of the channel capacity of the focused LG beam in the anisotropic ocean turbulence, and analyze the relationship between it and the light source parameters as well as the turbulent ocean parameters. It is found that the focusing mirror can greatly enhance the channel capacity of the system at the geometric focal plane in oceanic turbulence. The results also demonstrated that the communication link can obtain high channel capacity by adopting longer beam wavelength, greater initial beam waist radius, and larger number of transmission channels. Further, the capacity of the system increases with the decrease of the mean squared temperature dissipation rate, temperature-salinity contribution ratio and turbulence outer scale factor, and the increase of the kinetic energy dissipation rate per unit mass of fluid, turbulence inner scale factor and anisotropy factor. Compared with Hankel-Bessel beam with diffraction-free characteristics and unfocused LG beam, the focused LG beam shows superior anti-turbulence interference properties, which provides a theoretical reference for the research and development of underwater optical communication links using focused LG beams.

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Section: Introductionmentioning

confidence: 99%

Properties of focused Laguerre–Gaussian beam propagating in anisotropic ocean turbulence

Wang 王,

Ma 马,

Yuan 袁

et al. 2024

Chinese Phys. B

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“…Coupling efficiency is usually used to evaluate the performance of a coupling system [5][6][7]. The coupling efficiency can be derived from two kinds of calculations: one based on geometric optics and the other one based on physics optics.…”

Section: Introductionmentioning

confidence: 99%

Design and Experimental Analysis of an Optical Fiber Coupling System for a Ground-based Telescope with Adaptive Optics

Wang,

Ge,

Cai

et al. 2023

J. Phys.: Conf. Ser.

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Astronomy photonics has opened up a new era for the application of astronomical optical instruments. The fiber coupling system serves as the crucial link between the telescope and photonic devices. This paper explores a beam shaping method that utilizes a coupled lens to enhance the efficiency of coupling light into an optical single mode fiber. Compared to directly coupling the telescope beam into the fiber, this approach offers improved coupling efficiency and greater adjustment tolerance. The laboratory-based optical fiber coupling system described in this study comprises an imaging component with an F/50 ratio and a fiber coupling component. Theoretical analysis indicates that optimal coupling efficiency is achieved when the diameter of the focusing spot, limited by diffraction, matches the fiber core size. Any axial error, position error, or tip-tilt error between the lens and the fiber will reduce the coupling efficiency. Experimental results confirm that the coupling system achieves an efficiency of approximately 70%, which is close to the theoretical limit of 78%. These findings underscore the effectiveness of the fiber coupling method.

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Improving fiber coupling efficiency by shaping the transmission trajectory of the vortex beam

Qin,

Yang,

Wen

et al. 2024

Optics Communications

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Optimizing fibers coupling efficiency in the turbulent atmosphere by using a focusing lens system

Cited by 5 publications

References 18 publications

Properties of focused Laguerre–Gaussian beam propagating in anisotropic ocean turbulence

Properties of focused Laguerre–Gaussian beam propagating in anisotropic ocean turbulence

Design and Experimental Analysis of an Optical Fiber Coupling System for a Ground-based Telescope with Adaptive Optics

Improving fiber coupling efficiency by shaping the transmission trajectory of the vortex beam

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