Detail publikace

Diffraction Effects and Optical Beam Shaping in FSO Terminals

Originální název

Diffraction Effects and Optical Beam Shaping in FSO Terminals

Anglický název

Diffraction Effects and Optical Beam Shaping in FSO Terminals

Jazyk

en

Originální abstrakt

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.

Anglický abstrakt

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.

BibTex


@inbook{BUT126914,
  author="Juraj {Poliak} and Peter {Barcík} and Otakar {Wilfert}",
  title="Diffraction Effects and Optical Beam Shaping in FSO Terminals",
  annote="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.",
  address="Springer International Publishing",
  booktitle="Optical Wireless Communications - An Emerging Technology",
  chapter="126914",
  doi="10.1007/978-3-319-30201-0",
  howpublished="online",
  institution="Springer International Publishing",
  year="2016",
  month="july",
  pages="1--21",
  publisher="Springer International Publishing",
  type="book chapter"
}