Ground equivalent verification for atmospheric turbulence effects on fiber-coupling efficiency of satellite-to-ground downlink

Yang, Qingbo; Li, Lifang; Guo, Pengzhen; Wang, Qiang; Yu, Siyuan; Tan, Liying; Ma, Jing

doi:10.1117/1.oe.57.12.126102

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…In Section 4, we analyze turbulence-induced fluctuations of the instantaneous coupling efficiency for receivers coupling to few-mode fibers. To address the additional complexity inherent in statistically modeling the coupling to few-mode fiber relative to single-mode fiber, [16][17][18] we combine a theoretical framework for few-mode fiber coupling 19,20 with Monte Carlo simulations using Kolmogorov phase screens 21 to obtain a model for the probability density function (pdf) and temporal power spectrum of these fluctuations.…”

Section: Introductionmentioning

confidence: 99%

Statistical analysis of fading power vectors for real-time atmospheric channel emulation

Chahine

Katz

Vyhnalek

et al. 2023

Free-Space Laser Communications XXXV

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The design and testing of a free-space optical communication system requires assessment of the impact of random fluctuations in received power from a laser beam transmitted over an atmospheric channel. A number of methods for generating fading power vectors for in-lab emulation of an atmospheric channel have previously been reported. These techniques include spectral shaping and filtering of a signal from a normally distributed pseudo-random number generator, full wave optics simulations with random phase screens, and pre-recorded measurements from experimental free-space links. In this work, a statistical analysis of atmospheric fading is presented with the goal of producing a practical engineering model suitable for generating synthetic fade vectors in real-time for long-duration receiver testing with channel interleaving. Specifically, a parametric model is developed for turbulence-induced fade on space-to-ground links with large-aperture receivers, including aperture-averaging and the effects of aperture size on the instantaneous coupling efficiency for mode-limited receivers. In particular, we analyze the probability density function and temporal power spectrum for fluctuations of the coupling efficiency for few-mode fibers in a range of turbulence conditions.

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Section: Introductionmentioning

confidence: 99%

Statistical analysis of fading power vectors for real-time atmospheric channel emulation

Chahine

Katz

Vyhnalek

et al. 2023

Free-Space Laser Communications XXXV

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Experimental verification of fiber coupling characteristics for FSO downlinks from the International Space Station

et al. 2023

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Free-space optical (FSO) systems are compulsory to realize high capacity and interference-free communication links from low-Earth orbit (LEO) satellite constellations as well as spacecraft and space stations to the Earth. To be integrated with high-capacity ground networks, the collected portion of the incident beam should be coupled into an optical fiber. To accurately evaluate the signal-to-noise ratio (SNR) and bit-error rate (BER) performance metrics, the probability density function (PDF) of fiber coupling efficiency (CE) must be determined. Previous studies have experimentally verified the CE PDF for a single-mode fiber, however, there is no such investigation for the CE PDF of a multi-mode fiber (MMF) in a LEO-to-ground FSO downlink. In this paper, for the first time, the CE PDF for a 200-μm MMF is experimentally investigated using data from an FSO downlink from the Small Optical Link for International Space Station (SOLISS) terminal to a 40-cm sub-aperture optical ground station (OGS) supported by a fine-tracking system. An average CE of 5.45 dB was also achieved given that the alignment between SOLISS and OGS was not optimal. In addition, using the angle-of-arrival (AoA) and received power data, the statistical characteristics such as channel coherence time, power spectral density, spectrogram, and PDFs of AoA, beam misalignments, and atmospheric turbulence-induced fluctuations are revealed and compared with the state-of-the-art theoretical background.

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Verification of the mode fidelity and Fried parameter for optical turbulence generated by a spatial light modulator

Chahine

Tedder

Floyd³

et al. 2022

Opt. Continuum

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The ability of a holographic optical spatial mode generator to reproduce a laser beam which has propagated through simulated atmospheric turbulence is characterized via wavefront sensor (WFS) measurements. The range of optical turbulence which can be effectively recreated is determined including its dependence on the pixel resolution of the spatial light modulator used as a hologram to modulate the beam. Optimal sampling of the hologram grating for producing turbulent spatial modes is studied analytically and experimentally. Mode fidelity above 90% is verified up to D/r0 = 10 with less than 3% error in the ratio D/r0. The Fried parameter is verified up to D/r0 = 50 demonstrating less than 9% error producing the targeted ratio D/r0.

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Ground equivalent verification for atmospheric turbulence effects on fiber-coupling efficiency of satellite-to-ground downlink

Cited by 3 publications

References 13 publications

Statistical analysis of fading power vectors for real-time atmospheric channel emulation

Statistical analysis of fading power vectors for real-time atmospheric channel emulation

Experimental verification of fiber coupling characteristics for FSO downlinks from the International Space Station

Verification of the mode fidelity and Fried parameter for optical turbulence generated by a spatial light modulator

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