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Proceedings Paper

Fiber bundles in transceivers to mitigate scintillation effects on free-space optical networks
Author(s): Peter G. LoPresti; Nathan Brooks; Warren Sumpter; Hazem Refai
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Paper Abstract

Accuracy of alignment is a key factor for successfully establishing and maintaining connections in networks of freespace optical links, and is particularly critical when one or both of the transceivers are moving. Scintillation and other atmospheric effects create beam deflections that further complicate the alignment process. This paper studies the use of a fiber-optic bundle at the transmitter and receiver to mitigate the atmospheric effects on the link up-time. The bundle at the transmitter allows fast, non-mechanical steering of the optical beam to track and correct for relative motion. The bundle at the receiver allows for a significant improvement in misalignment tolerance, particularly to angular misalignment. Laboratory experiments and theoretical analyses were conducted on a free-space link to determine the inter-relationship between spacing of the fibers within the bundle, the focal lengths of the transceiver lenses, the beam deflection angle, and the misalignment tolerance for varying atmospheric conditions. A shorter focal length lens at the transmitter provides greater coverage, while a moderate focal length lens at the receiver reduces the bundle size required to improve misalignment tolerance. A smaller overall system size is possible, provided that sufficient power is used to overcome the greater spatial spreading and subsequent loss of peak power at the receiver.

Paper Details

Date Published: 4 May 2007
PDF: 9 pages
Proc. SPIE 6551, Atmospheric Propagation IV, 65510N (4 May 2007); doi: 10.1117/12.718265
Show Author Affiliations
Peter G. LoPresti, The Univ. of Tulsa (United States)
Nathan Brooks, The Univ. of Tulsa (United States)
Warren Sumpter, The Univ. of Tulsa (United States)
Hazem Refai, The Univ. of Oklahoma (United States)

Published in SPIE Proceedings Vol. 6551:
Atmospheric Propagation IV
Cynthia Y. Young; G. Charmaine Gilbreath, Editor(s)

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