Detail publikace

Extended Model of the Restricted Beam for FSO links

Originální název

Extended Model of the Restricted Beam for FSO links

Anglický název

Extended Model of the Restricted Beam for FSO links

Jazyk

en

Originální abstrakt

Modern wireless optical communication systems in many aspects overcome wire or radio communications. Their advantages are license-free operation and broad bandwidth that they offer. The medium in free-space optical (FSO) links is the atmosphere. Operation of outdoor FSO links struggles with many atmospheric phenomena that deteriorate phase and amplitude of the transmitted optical beam. This beam originates in the transmitter and is affected by its individual parts, especially by the lens socket and the transmitter aperture, where attenuation and diffraction effects take place. Both of these phenomena unfavourable influence the beam and cause degradation of link availability, or its total malfunction. Therefore, both of these phenomena should be modelled and simulated, so that one can judge the link function prior to the realization of the system. Not only the link availability and reliability are concerned, but also economic aspects. In addition, the transmitted beam is not, generally speaking, circularly symmetrical, what makes the link simulation more difficult. In a comprehensive model, it is necessary to take into account the ellipticity of the beam that is restricted by circularly symmetrical aperture where then the attenuation and diffraction occur. General model is too computationally extensive; therefore simplification of the calculations by means of analytical and numerical approaches will be discussed. Presented model is not only simulated using computer, but also experimentally proven. One can then deduce the ability of the model to describe the reality and to estimate how far can one go with approximations, i.e. limitations of the model are discussed.

Anglický abstrakt

Modern wireless optical communication systems in many aspects overcome wire or radio communications. Their advantages are license-free operation and broad bandwidth that they offer. The medium in free-space optical (FSO) links is the atmosphere. Operation of outdoor FSO links struggles with many atmospheric phenomena that deteriorate phase and amplitude of the transmitted optical beam. This beam originates in the transmitter and is affected by its individual parts, especially by the lens socket and the transmitter aperture, where attenuation and diffraction effects take place. Both of these phenomena unfavourable influence the beam and cause degradation of link availability, or its total malfunction. Therefore, both of these phenomena should be modelled and simulated, so that one can judge the link function prior to the realization of the system. Not only the link availability and reliability are concerned, but also economic aspects. In addition, the transmitted beam is not, generally speaking, circularly symmetrical, what makes the link simulation more difficult. In a comprehensive model, it is necessary to take into account the ellipticity of the beam that is restricted by circularly symmetrical aperture where then the attenuation and diffraction occur. General model is too computationally extensive; therefore simplification of the calculations by means of analytical and numerical approaches will be discussed. Presented model is not only simulated using computer, but also experimentally proven. One can then deduce the ability of the model to describe the reality and to estimate how far can one go with approximations, i.e. limitations of the model are discussed.

BibTex


@inproceedings{BUT94722,
  author="Juraj {Poliak} and Otakar {Wilfert}",
  title="Extended Model of the Restricted Beam for FSO links",
  annote="Modern wireless optical communication systems in many aspects overcome wire or radio communications. Their 
advantages are license-free operation and broad bandwidth that they offer. The medium in free-space optical (FSO) links 
is the atmosphere. Operation of outdoor FSO links struggles with many atmospheric phenomena that deteriorate phase 
and amplitude of the transmitted optical beam. This beam originates in the transmitter and is affected by its individual 
parts, especially by the lens socket  and the transmitter aperture, where attenuation and diffraction effects take place. 
Both of these phenomena unfavourable influence the beam  and cause degradation of link availability, or its total 
malfunction. Therefore, both of these phenomena should be modelled and simulated, so that one can judge the link 
function prior to the realization of the system. Not only the link availability and reliability are concerned, but also 
economic aspects. 
In addition, the transmitted beam is not, generally speaking, circularly symmetrical, what makes the link simulation 
more difficult. In a comprehensive model, it is necessary to take into account the ellipticity of the beam that is restricted 
by circularly symmetrical aperture  where then the attenuation and diffraction occur. General model is too 
computationally extensive; therefore simplification of the calculations by means of analytical and numerical approaches 
will be discussed.  
Presented model is not only simulated using computer, but also experimentally proven. One can then deduce the ability 
of the model to describe the reality and to estimate how far can one go with approximations, i.e. limitations of the model 
are discussed.",
  address="SPIE",
  booktitle="Proceedings of the Optics & Photonics 2012 Conference on Laser Communication and Propagation through the Atmosphere and Oceans",
  chapter="94722",
  howpublished="print",
  institution="SPIE",
  year="2012",
  month="august",
  pages="1--8",
  publisher="SPIE",
  type="conference paper"
}