Dr. Florian X. David Profile

Dr. Florian X. David

Director at German Aerospace Center (DLR)

SPIE Involvement:

Author

Proceedings Article | 18 April 2005 Paper

Coherent transmission feasibility analysis

Joachim Horwath, Florian David, Markus Knapek, Nicolas Perlot

Proceedings Volume 5712, (2005) https://doi.org/10.1117/12.589196

KEYWORDS: Signal to noise ratio, Satellites, Receivers, Turbulence, Atmospheric modeling, Atmospheric optics, Atmospheric propagation, Numerical simulations, Oscillators, Homodyne detection

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Proceedings Article | 11 November 2004 Paper

Atmospheric refraction and its impact on free-space optic communication systems

Karin Hedman, Florian David

Proceedings Volume 5572, (2004) https://doi.org/10.1117/12.565475

KEYWORDS: Refraction, Atmospheric modeling, Atmospheric optics, Astronomy, Refractive index, Free space optics, Earth's atmosphere, Satellites, Stratosphere, Clouds

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Proceedings Article | 11 November 2004 Paper

Atmospheric turbulence monitoring at DLR

Florian David

Proceedings Volume 5572, (2004) https://doi.org/10.1117/12.565478

KEYWORDS: Turbulence, Satellites, Atmospheric turbulence, Sensors, Telescopes, Scintillation, Calibration, Atmospheric optics, Atmospheric modeling, Atmospheric propagation

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Research activities at the German Aerospace Center (DLR) concerning optical free-space communications have focussed on coherent communication systems for inter-satellite link (ISL) applications for a long time. Under DLR contract Tesat Spacecom has developed the DLR-LCT (laser communications terminal) which relies on coherent technology. This terminal will be verified in space as secondary payload onboard the earth observation satellite TerraSAR-X, to be launched in 2006. In a first step, downlink experiments will be carried out. The DLR Institute of Communications and Navigation is involved in this ambitious project by assessing the feasibility of the downlink experiment through atmospheric turbulence and by conducting channel measurements. An initial feasibility study shall theoretically investigate the influence of atmospheric turbulence on coherent optical transmission and assess the success probabilities of the particular experiment with regard to the specific ground station conditions. Since theory is always based on arbitrary assumptions on the composition and structure of the atmosphere, measurements at the specific ground station shall be carried out. Measurement results shall enable a refinement of disturbance models in order to predict the condition during the downlink experiments. Relevant atmospheric parameters, such as scintillations, phase-front distortions, atmospheric seeing, angle-of-arrival fluctuations, attenuation, Cn2- and wind profiles will have to be recorded. To carry out these measurements, DLR will develop an "Atmospheric Turbulence Monitor" (ATM). The ATM mainly consists of a 16-inch telescope and a number of instruments for various measurements. These instruments are based on astronomical devices for use with stars, however have to be modified to be suited for measurements with close objects such as LEO or GEO satellites. The ATM will as well comprise a tracking system, that allows for measurements with LEO satellites such as TerraSAR-X. This paper presents the outline of the DLR atmospheric turbulence monitoring measurement campaign and describes the preliminary design of the "Atmospheric Turbulence Monitor".

Proceedings Article | 16 June 2004 Paper

Scintillation loss in free-space optic IM/DD systems

Florian David

Proceedings Volume 5338, (2004) https://doi.org/10.1117/12.528832

KEYWORDS: Scintillation, Receivers, Atmospheric modeling, Atmospheric propagation, Atmospheric optics, Systems modeling, Convolution, Transmitters, Mathematical modeling, Atmospheric scintillation

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Proceedings Article | 3 July 2003 Paper

Evaluation of FEC for the atmospheric optical IM/DD channel

Hennes Henniger, Florian David, Dirk Giggenbach, Christoph Rapp

Proceedings Volume 4975, (2003) https://doi.org/10.1117/12.478931

KEYWORDS: Atmospheric optics, Channel projecting optics, Forward error correction, Receivers, Monte Carlo methods, Data modeling, Telecommunications, Transmitters, Aerospace engineering, Data communications

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Proceedings Article | 3 July 2003 Paper

Overview of the FASOLT experiment and final results

Florian David, Dirk Giggenbach, Rainer Landrock, Joachim Horwath, Klaus Pribil, Edgar Fischer, Robert Buschner, Detlev Blaschke

Proceedings Volume 4975, (2003) https://doi.org/10.1117/12.478930

KEYWORDS: Transmitters, Scintillation, Receivers, Refraction, Signal attenuation, Data communications, Optical testing, Free space optics, Data transmission, Visibility

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Proceedings Article | 3 July 2003 Paper

Multiple-wavelength free-space laser communications

Robert Purvinskis, Dirk Giggenbach, Hennes Henniger, Nicolas Perlot, Florian David

Proceedings Volume 4975, (2003) https://doi.org/10.1117/12.478932

KEYWORDS: Atmospheric propagation, Turbulence, Free space optical communications, Wave propagation, Receivers, Optical simulations, Atmospheric optics, Atmospheric particles, Absorption, Refraction

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Proceedings Article | 30 April 2003 Paper

Long-term near-ground optical scintillation measurements

Dirk Giggenbach, Hennes Henniger, Florian David

Proceedings Volume 4976, (2003) https://doi.org/10.1117/12.479202

KEYWORDS: Scintillation, Turbulence, Atmospheric optics, Free space optics, Meteorology, Receivers, Atmospheric scintillation, Atmospheric propagation, Optical testing, Laser optics

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Proceedings Article | 30 April 2003 Paper

Discussion of the direct detection Rx-power distribution as derived from intensity statistics and comparison with measurements

Nicolas Perlot, Dirk Giggenbach, Hermann Bischl, Florian David

Proceedings Volume 4976, (2003) https://doi.org/10.1117/12.479203

KEYWORDS: Scintillation, Atmospheric propagation, Receivers, Convolution, Data modeling, Stochastic processes, Laser beam propagation, Spherical lenses, Turbulence, Atmospheric modeling

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Proceedings Article | 26 April 2002 Paper

Measurements at a 61-km near-ground optical transmission channel

Dirk Giggenbach, Florian David, Rainer Landrock, Klaus Pribil, Edgar Fischer, Robert Buschner, Detlev Blaschke

Proceedings Volume 4635, (2002) https://doi.org/10.1117/12.464089

KEYWORDS: Receivers, Turbulence, Scintillation, Transmitters, Atmospheric propagation, Telescopes, Transmittance, Atmospheric optics, Aerospace engineering, Data transmission

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Proceedings Article | 26 April 2002 Paper

Preliminary results of a 61km ground-to-ground optical IM/DD data transmission experiment

Florian David, Dirk Giggenbach, Rainer Landrock, Klaus Pribil, Edgar Fischer, Robert Buschner, Detlev Blaschke

Proceedings Volume 4635, (2002) https://doi.org/10.1117/12.464094

KEYWORDS: Atmospheric optics, Transmitters, Video, Receivers, Scintillation, Diodes, Free space optics, Data transmission, Data modeling, Error analysis

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Proceedings Article | 2 May 2000 Paper

Breadboard model of a coherent optical BPSK homodyne system with virtual pilot tone (ViP)-based receiver and MRC auxiliary channel

Florian David, Christoph Rapp

Proceedings Volume 3932, (2000) https://doi.org/10.1117/12.384316

KEYWORDS: Receivers, Modulation, Transmitters, Homodyne detection, Sensors, Phase shift keying, Clocks, Modulators, Signal detection, Channel projecting optics

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Showing 5 of 12 publications

Conference Committee Involvement (5)

Free-Space Laser Communication Technologies XX

24 January 2008 | San Jose, California, United States

Free-Space Laser Communication Technologies XIX

25 January 2007 | San Jose, California, United States

Free-Space Laser Communication Technologies XVIII

24 January 2006 | San Jose, California, United States

Atmospheric Propagation II

29 March 2005 | Orlando, Florida, United States

Free-Space Laser Communication Technologies XVII

25 January 2005 | San Jose, California, United States

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