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Proceedings Paper

Mitigating angular misalignment from atmospheric effects in FSO links
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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 by creating rays that enter the receiver at an angle to the optical axis. This paper theoretically studies the effective angular misalignment that can be caused by such deflections and mitigation methods for a traditional free-space optical link. The theory uses Gaussian beam propagation and system theory to determine the optical power distribution at the receiver lens and the position of the beam at the lens focal point. Coordinate transformation and overlap integrals are used to assist in calculating the amount of power collected by the lens and incident on the collecting core of the fiber. The use of a fiber bundle at the focal plane of the lens is investigated as a possible method for reducing the receiver sensitivity to misalignment. The simulation results show that some reduction in misalignment sensitivity within some practical system design limits.

Paper Details

Date Published: 12 May 2007
PDF: 8 pages
Proc. SPIE 6551, Atmospheric Propagation IV, 65510K (12 May 2007); doi: 10.1117/12.719772
Show Author Affiliations
Peter G. LoPresti, The Univ. of Tulsa (United States)
Hazem Refai, The Univ. of Oklahoma (United States)
James J. Sluss, 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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