Publication detail

Diffraction Effects and Optical Beam Shaping in FSO Terminals

POLIAK, J. BARCÍK, P. WILFERT, O.

Original Title

Diffraction Effects and Optical Beam Shaping in FSO Terminals

Type

book chapter

Language

English

Original 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 semicon-ductor lasers. From the Huygens-Fresnel principle, two models of the Fresnel dif-fraction were derived. These models provided means for defining contrast of the diffraction pattern that can be used to quantitatively assess the influence of the dif-fraction effects on the optical link performance. The second section is devoted to the study that shows the misalignment analysis for two cases – lateral displace-ment 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 opti-mal 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 deter-mine the optimal parameters for a Flattened Gaussian beam at the transmitter plane.

Keywords

Free-space optical link, Fresnel diffraction, geometrical loss, pointing error, Flattened Gaussian beam, scintillation index, atmospheric turbulence

Authors

POLIAK, J.; BARCÍK, P.; WILFERT, O.

Released

1. 7. 2016

Publisher

Springer International Publishing

Location

Springer International Publishing Switzerland

ISBN

978-3-319-30200-3

Book

Optical Wireless Communications - An Emerging Technology

Edition number

1

Pages from

1

Pages to

21

Pages count

21

URL

http://www.springer.com/gp/book/9783319302003

BibTex

@inbook{BUT126914,
  author="Juraj {Poliak} and Peter {Barcík} and Otakar {Wilfert}",
  title="Diffraction Effects and Optical Beam Shaping in FSO Terminals",
  booktitle="Optical Wireless Communications - An Emerging Technology",
  year="2016",
  publisher="Springer International Publishing",
  address="Springer International Publishing Switzerland",
  edition="1",
  pages="1--21",
  doi="10.1007/978-3-319-30201-0",
  isbn="978-3-319-30200-3",
  url="http://www.springer.com/gp/book/9783319302003"
}