
Proceedings Paper
Free-space optical communication at 1.55 μm and 4.85 μm and turbulence measurements in the evaporation layerFormat | Member Price | Non-Member Price |
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Paper Abstract
Free-space optics (FSO) holds the potential for high bandwidth communication in situations where landline
communication is not practical, with relatively low cost and maintenance. The short-wave infrared (SWIR) and midwave
infrared (MWIR) bands contain atmospheric transmission windows spanning approximately 1.50-1.75 μm and 4.6-
4.9 μm, respectively. Transmission coefficients and losses were modeled using MODTRAN for optical path lengths of
up to 2 km to for various atmospheric conditions. The determination of the refractive index structure parameter Cn
2 is useful in calculating the time-dependent Fried parameter, r0, which provides an indication of the magnitude of the phase distortion of an optical wavefront by scintillation in accordance with the Kalomogorov model. By better understanding the effects of turbulence and Cn 2 on FSO transmission through modeling and experimental measurements, measures can be implemented to reduce the bit error rate and increase data throughput, enabling more efficient and accurate communication links. FSO beam optimization is achievable using a Shack-Hartmann wavefront sensor, whereby
wavefront distortion of a transmitted beam is measured to compensate in real time for the effects of turbulence to provide optimized FSO reception. Using advanced techniques and compensation methods, limitations associated with infrared FSO transmission and reception in the evaporation layer may be overcome or circumvented to provide high bandwidth communication through turbulence and/or adverse weather conditions.
Paper Details
Date Published: 19 October 2012
PDF: 12 pages
Proc. SPIE 8540, Unmanned/Unattended Sensors and Sensor Networks IX, 85400C (19 October 2012); doi: 10.1117/12.978292
Published in SPIE Proceedings Vol. 8540:
Unmanned/Unattended Sensors and Sensor Networks IX
Edward M. Carapezza; Henry J. White, Editor(s)
PDF: 12 pages
Proc. SPIE 8540, Unmanned/Unattended Sensors and Sensor Networks IX, 85400C (19 October 2012); doi: 10.1117/12.978292
Show Author Affiliations
John Zeller, Naval Undersea Warfare Ctr. (United States)
Tariq Manzur, Naval Undersea Warfare Ctr. (United States)
Published in SPIE Proceedings Vol. 8540:
Unmanned/Unattended Sensors and Sensor Networks IX
Edward M. Carapezza; Henry J. White, Editor(s)
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