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Diffraction Effects and Optical Beam Shaping in FSO Terminals

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Optical Wireless Communications

Part of the book series: Signals and Communication Technology ((SCT))

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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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Author information

Authors and Affiliations

  1. Department of Satellite Networks, German Aerospace Center (DLR), Weßling, Germany

    Juraj Poliak

  2. Department of Radio Electronics, Brno University of Technology, Brno, Czech Republic

    Peter Barcik & Otakar Wilfert

Authors
  1. Juraj Poliak
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  2. Peter Barcik
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  3. Otakar Wilfert
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Corresponding author

Correspondence to Otakar Wilfert .

Editor information

Editors and Affiliations

  1. Department of Electrical and Electronics Engineering, Özyeğin University, İstanbul, Turkey

    Murat Uysal

  2. Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Milan, Italy

    Carlo Capsoni

  3. Faculty of Engineering and Environment, University of Northumbria at Newcastle, Newcastle-upon-Tyne, United Kingdom

    Zabih Ghassemlooy

  4. Department of Informatics and Telecommunications, University of Peloponnese, Tripolis, Arkadhia, Greece

    Anthony Boucouvalas

  5. Department of Broadband Infocommunication and Electromagnetic Theory, Budapest University of Technology and Economics, Budapest, Hungary

    Eszter Udvary

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Poliak, J., Barcik, P., Wilfert, O. (2016). Diffraction Effects and Optical Beam Shaping in FSO Terminals. In: Uysal, M., Capsoni, C., Ghassemlooy, Z., Boucouvalas, A., Udvary, E. (eds) Optical Wireless Communications. Signals and Communication Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-30201-0_7

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

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-30200-3

  • Online ISBN: 978-3-319-30201-0

  • eBook Packages: EngineeringEngineering (R0)

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