Statistical model of the efficiency for spatial light coupling into a single-mode fiber in the presence of atmospheric turbulence

Abstract Benefiting from the rapid development of fiber-optic devices, high-speed free-space optical communication systems have recently used fiber-optic components. The received laser beam in such a system couples into single-mode fiber (SMF) at the input of the receiver module. This work is oriented to common problems in actual free-space optical coupling systems, such as atmospheric turbulence, optical system aberration, and fiber positioning error. We derive the statistical expectation models of SMF coupling efficiency with optical system aberration in the presence of atmospheric turbulence and the statistical expectation models of SMF coupling efficiency with fiber positioning error in the presence of atmospheric turbulence. The influences of optical system aberration and fiber positioning error on the coupling efficiency under different turbulence strengths are also analyzed in this paper.

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Operational condition for direct single-mode-fiber coupled free-space optical terminal under strong atmospheric turbulence

Optical Engineering ◽

10.1117/1.oe.51.3.031203 ◽

2012 ◽

Vol 51 (3) ◽

pp. 031203 ◽

Cited By ~ 2

Author(s):

Yoshinori Arimoto

Keyword(s):

Atmospheric Turbulence ◽

Free Space ◽

Single Mode ◽

Single Mode Fiber ◽

Free Space Optical

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Characterization of Localized Atmospheric Turbulence Layer Using Laser Light Backscattered off Moving Target

Applied Sciences ◽

10.3390/app10196887 ◽

2020 ◽

Vol 10 (19) ◽

pp. 6887

Author(s):

Victor A. Kulikov ◽

Svetlana L. Lachinova ◽

Mikhail A. Vorontsov ◽

Venkata S. Rao Gudimetla

Keyword(s):

Atmospheric Turbulence ◽

Autocorrelation Function ◽

Laser Light ◽

Target Position ◽

Single Mode ◽

Single Mode Fiber ◽

Propagation Path ◽

Moving Target ◽

Optical Propagation ◽

Received Power

A concept of atmospheric turbulence characterization using laser light backscattered off a moving unresolved target or a moving target with a glint is considered and analyzed through wave-optics numerical simulations. The technique is based on analysis of the autocorrelation function and variance of the power signal measured by the target-in-the-loop atmospheric sensing (TILAS) system composed of a single-mode-fiber-based optical transceiver and the moving target. It is shown that the TILAS received power signal autocorrelation function strongly depends on the turbulence distribution and is weakly sensitive to the turbulence strength, while the signal variance equally depends on these parameters. Assuming the atmospheric turbulence model can be represented by a single spatially localized turbulence layer and the target position and speed are known independently, consecutive analysis of the autocorrelation function and variance of the TILAS signal allows evaluation of both the turbulence layer strength and position along the optical propagation path. It is also demonstrated that the autocorrelation function can potentially be used for the atmospheric turbulence outer scale estimation.

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