KEYWORDS: Turbulence, Free space optics, Receivers, Atmospheric turbulence, Signal attenuation, Systems modeling, Signal to noise ratio, Free space optical communications, Telecommunications, Performance modeling
When the beam waist radius of the receiver is significantly larger than that of the receiver, the free-space optical link is vulnerable to some optical capture risks in the physical layer. In this paper, we propose a new method to analyze the average secrecy capacity performance of the FSO system under Fisher-Snedecor (F)-distribution turbulence combined with the unified pointing error. As a key feature, we evaluate security performance in the presence of an external eavesdropper that exists anywhere on the same receiving plane as the receiver. Based on this model, we derive the exact average secrecy capacity expression and verify it by accurate Monte Carlo simulation. By using the expression, we analyze in detail the influence of the electrical signal-to-noise ratio of the main channel, the influence of different waist radius of the beam in the receiver plane on the average secrecy capacity performance under different turbulence conditions.
The fiber-coupling efficiency of a satellite-to-ground (STG) downlink laser communication system is particularly influenced by atmospheric turbulence, thereby reducing the communication performance significantly. We report on a highly reliable ground equivalent verification to demonstrate the atmospheric turbulence effects on the fiber-coupling efficiency of an STG downlink. Statistical distribution of fiber-coupling efficiency obtained by experiment contributes a high consistency with the numerical simulation, with a correlation coefficient of above 0.97. The average deviation of fiber-coupling efficiency is only around 10% according to different trials on the course of ground equivalent verification. Ground equivalent verification provides a way to study the actual STG downlink with a smaller diameter of aperture, which might also potentially be a great help to serve on an experimental basis and reference for the optimal design of the STG downlink laser communication systems.
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