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Published in:
An Overview of Optical Wireless Communications Read chapter Read first chapter

2016 | OriginalPaper | Chapter

7. Diffraction Effects and Optical Beam Shaping in FSO Terminals

Authors : Juraj Poliak, Peter Barcik, Otakar Wilfert

Published in: Optical Wireless Communications

Publisher: Springer International Publishing

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Abstract

The first part of the chapter is focused on the wave effects, which occur when the Gaussian beam is being restricted by a circular aperture, e.g., by a lens socket. An elliptically symmetrical Gaussian beam is considered in the analysis to improve the generality and to analyze beams produced by edge-emitting semiconductor lasers. From the Huygens-Fresnel principle, two models of the Fresnel diffraction were derived. These models provided means for defining contrast of the diffraction pattern that can be used to quantitatively assess the influence of the diffraction effects on the optical link performance. The second section is devoted to the study that shows the misalignment analysis for two cases—lateral displacement and angular misalignment of the transmitter and the receiver, respectively. The expression for the misalignment attenuation of the elliptical Gaussian beam in FSO links is derived. It will be also shown, how the elliptical Gaussian beam can be used to improve the system’s resistance to some deteriorating effects, e.g., building sway. The third part of the chapter is focused on the analysis of the optimal optical intensity distribution within a radiated laser beam at a transmitter plane which is propagated through free space. The aim of the chapter is to determine the optimal parameters for a Flattened Gaussian beam at the transmitter plane.

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Metadata
Title
Diffraction Effects and Optical Beam Shaping in FSO Terminals
Authors
Juraj Poliak
Peter Barcik
Otakar Wilfert
Copyright Year
2016
Book
Optical Wireless Communications

Print ISBN: 978-3-319-30200-3

Electronic ISBN: 978-3-319-30201-0

Copyright Year: 2016

DOI
https://doi.org/10.1007/978-3-319-30201-0_7