Turbulence strength and temporal correlation in a terrestrial laser communication link

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Abstract

In a laboratory experiment we propagate a continuous-wave, expanded laser beam over a surface with evenly distributed heat and record the received distorted optical signal. Temperature is continuously measured in two fixed points to determine turbulence strength. Through a number of trials covering a wide range of turbulence conditions we demonstrate that the temporal correlation of the received signal fluctuations has a strong dependence on the turbulence strength at the link path. Power spectra of the received signals show a clear increase in both slope and maximum frequency as the temperature gradient increases. Measurements suggest that scintillation also correlates with temporal correlation at weak turbulence conditions and such correlation decays in stronger conditions.

Original languageEnglish
Title of host publicationFree-Space Laser Communications X
DOIs
StatePublished - 2010
EventFree-Space Laser Communications X - San Diego, CA, United States
Duration: 2 Aug 20103 Aug 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7814
ISSN (Print)0277-786X

Conference

ConferenceFree-Space Laser Communications X
CountryUnited States
CitySan Diego, CA
Period2/08/103/08/10

Keywords

  • Atmospheric turbulence
  • Free-space laser communication
  • Optical propagation
  • Scintillation
  • Signal fading
  • Temporal correlation
  • Temporal spectrum

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