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

Yousef K. Chahine; Evan J. Katz; Brian E. Vyhnalek; Sarah A. Tedder

doi:10.1117/12.2648447

15 March 2023 Statistical analysis of fading power vectors for real-time atmospheric channel emulation

Yousef K. Chahine, Evan J. Katz, Brian E. Vyhnalek, Sarah A. Tedder

Proceedings Volume 12413, Free-Space Laser Communications XXXV; 124131L (2023) https://doi.org/10.1117/12.2648447
Event: SPIE LASE, 2023, San Francisco, California, United States

Conference Poster

Abstract

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.

Citation Download Citation

Yousef K. Chahine, Evan J. Katz, Brian E. Vyhnalek, and Sarah A. Tedder "Statistical analysis of fading power vectors for real-time atmospheric channel emulation", Proc. SPIE 12413, Free-Space Laser Communications XXXV, 124131L (15 March 2023); https://doi.org/10.1117/12.2648447

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