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Proceedings Paper

Fade and surge asymmetry of direct single-mode-fiber coupled free-space optical signal under weak atmospheric turbulences
Author(s): Yoshinori Arimoto
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Paper Abstract

This paper reports propagation characteristic of direct single-mode-fiber (SMF) coupled free-space-optical signal. Accumulated data at recent indoor/outdoor demonstration experiments over 30-500 m link distance under weak to medium atmospheric turbulence conditions are analyzed and discussed. The results show asymmetric surge/fade ratios and long lower tail distribution in SMF-coupled signal intensities due to phase interference at the SMF receiving aperture, which is different from the result in the normal irradiance distribution, such as Gamma-Gamma distribution or log-normal distribution. This asymmetry indicates that reliable FSO links should be operated under sufficiently weak atmospheric turbulence environments where scintillation index is less than 0.1. This requirement is also valid to maintain mutual beacon tracking to assure precise tracking/pointing accuracy required for the direct SMF coupling.

Paper Details

Date Published: 5 May 2012
PDF: 8 pages
Proc. SPIE 8380, Atmospheric Propagation IX, 838004 (5 May 2012); doi: 10.1117/12.920356
Show Author Affiliations
Yoshinori Arimoto, National Institute of Information and Communications Technology (Japan)

Published in SPIE Proceedings Vol. 8380:
Atmospheric Propagation IX
Linda M. Wasiczko Thomas; Earl J. Spillar, Editor(s)

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