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Fiber-coupling efficiency for free-space optical communication through atmospheric turbulence.

Yamaç Dikmelik1, Frederic M Davidson

  • 1Department of Electrical and Computer Engineering, Johns Hopkins University, 105 Barton Hall, 3400 North Charles Street, Baltimore, Maryland 21218, USA. yamac@jhu.edu

Applied Optics
|August 24, 2005
PubMed
Summary

Atmospheric turbulence degrades laser beam quality, reducing fiber coupling efficiency in free-space optical communications. Using a seven-element coherent fiber array receiver significantly enhances this coupling efficiency.

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Area of Science:

  • Optical Engineering
  • Telecommunications
  • Atmospheric Optics

Background:

  • High-speed free-space optical communication systems increasingly utilize fiber-optic components.
  • Effective coupling of received laser beams into single-mode fibers is crucial for receiver performance.
  • Atmospheric turbulence degrades laser beam spatial coherence, limiting fiber-coupling efficiency.

Purpose of the Study:

  • To numerically evaluate fiber-coupling efficiency for laser light distorted by atmospheric turbulence.
  • To investigate the potential of a coherent fiber array as an improved receiver structure.

Main Methods:

  • Numerical evaluation of fiber-coupling efficiency under simulated atmospheric turbulence.
  • Analysis of a coherent fiber array receiver composed of multiple subapertures.

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Main Results:

  • Fiber-coupling efficiency is significantly reduced by atmospheric turbulence.
  • A coherent fiber array receiver demonstrates a substantial increase in fiber-coupling efficiency compared to single-element receivers.
  • A seven-subaperture coherent fiber array shows marked improvement in coupling efficiency.

Conclusions:

  • Coherent fiber arrays offer a promising solution to overcome turbulence-induced signal degradation in free-space optical communications.
  • Implementing a seven-element coherent fiber array can significantly enhance the reliability and performance of high-speed optical links.
  • This approach mitigates the impact of atmospheric turbulence on laser beam coupling into optical fibers.