Fiber-Coupling Efficiency of Laser Array Beam From Turbulent Atmosphere to Fiber Link

Free-space optical communication (FSOC) systems are nowadays integrated with fiber optical components developed for fiber-optic communications. In such integrated systems, the collected portion of the incident beam on the receiver lens is coupled into a single-mode fiber. The process of coupling, ho...

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Bibliographic Details
Published in:Journal of lightwave technology 2023-01, Vol.41 (1), p.59-65
Main Authors: Gokce, Muhsin Caner, Baykal, Yahya, Ata, Yalcin
Format: Article
Language:English
Subjects:
Atmospheric turbulence
Coupled modes
Coupling
Couplings
Efficiency
fiber coupling efficiency
Fiber lasers
Fiber optics
Free-space optical communication
Gaussian beams (optics)
laser array beam
Laser arrays
laser beam transmission
Laser beams
Lasers
Lenses
Measurement by laser beam
optical communication
Optical components
Optical fiber cables
Optical fiber communication
single mode fiber
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Summary:Free-space optical communication (FSOC) systems are nowadays integrated with fiber optical components developed for fiber-optic communications. In such integrated systems, the collected portion of the incident beam on the receiver lens is coupled into a single-mode fiber. The process of coupling, however, is mostly affected by the atmospheric turbulence which distorts the coherency of the propagating beam i.e., it results in speckle over the coupling lens causing a reduction in the coupling efficiency. In this article, we aimed at investigating the fiber coupling efficiency of laser array beams propagating in a turbulent atmosphere. For this purpose, using the Huygens-Fresnel principle, mutual coherence function (MCF) for a laser array beam incidence is formulated. In this way, the average power coupled into the fiber and the average received power on the coupling lens are derived for a laser array beam incidence. It is found that the fiber coupling efficiency clearly increases with the increase in ring radius and the number of Gaussian beams in the array and rapidly decreases with increasing structure constant of atmosphere, link distance, and the number of speckles over the receiver aperture. We also demonstrate the effect of various FSOC system parameters on the coupling efficiency.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2022.3204559