Fade and surge asymmetry of direct single-mode-fiber coupled free-space optical signal under weak atmospheric turbulences

Yoshinori Arimoto

doi:10.1117/12.920356

5 May 2012 Fade and surge asymmetry of direct single-mode-fiber coupled free-space optical signal under weak atmospheric turbulences

Yoshinori Arimoto

Author Affiliations +

Proceedings Volume 8380, Atmospheric Propagation IX; 838004 (2012) https://doi.org/10.1117/12.920356
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

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.

Citation Download Citation

Yoshinori Arimoto "Fade and surge asymmetry of direct single-mode-fiber coupled free-space optical signal under weak atmospheric turbulences", Proc. SPIE 8380, Atmospheric Propagation IX, 838004 (5 May 2012); https://doi.org/10.1117/12.920356

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