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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 29 — Oct. 10, 2008
  • pp: 5378–5389

Investigation of multilevel amplitude modulation for a dual-wavelength free-space optical communications system using realistic channel estimation and minimum mean-squared-error linear equalization

Colin N. Reinhardt, Sermsak Jaruwatanadilok, Yasuo Kuga, Akira Ishimaru, and James A. Ritcey  »View Author Affiliations

Applied Optics, Vol. 47, Issue 29, pp. 5378-5389 (2008)

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Fog is a highly dispersive medium at optical wavelengths, and the received pulse waveform may suffer significant distortion. Thus it is desirable to have the impulse response of the propagation channel to recover data transmitted through fog. The fog particle density and the particle size distribution both strongly influence the channel impulse response, yet it is difficult to estimate these parameters. We present a method using a dual-wavelength free-space optical system for estimating the average particle diameter and the particle number density and for approximating the particle distribution function. These parameters serve as inputs to estimate the atmospheric channel impulse response using simulation based on the modified vector radiative transfer theory. The estimated channel response is used to design a minimum mean-square-error equalization filter to improve the bit error rate by correcting distortion in the received signal waveform due to intersymbol interference and additive white Gaussian noise.

© 2008 Optical Society of America

OCIS Codes
(010.1300) Atmospheric and oceanic optics : Atmospheric propagation
(010.3310) Atmospheric and oceanic optics : Laser beam transmission
(290.1090) Scattering : Aerosol and cloud effects
(060.2605) Fiber optics and optical communications : Free-space optical communication
(200.2605) Optics in computing : Free-space optical communication
(010.5620) Atmospheric and oceanic optics : Radiative transfer

ToC Category:
Atmospheric and Oceanic Optics

Original Manuscript: February 13, 2008
Revised Manuscript: May 16, 2008
Manuscript Accepted: July 7, 2008
Published: October 7, 2008

Colin N. Reinhardt, Sermsak Jaruwatanadilok, Yasuo Kuga, Akira Ishimaru, and James A. Ritcey, "Investigation of multilevel amplitude modulation for a dual-wavelength free-space optical communications system using realistic channel estimation and minimum mean-squared-error linear equalization," Appl. Opt. 47, 5378-5389 (2008)

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