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Bringing the Visible Universe into Focus with Robo-AO
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Coherent optical link through the turbulent atmosphere.

Khelifa Djerroud1, Ouali Acef, André Clairon

  • 1LNE-SYRTE, Observatoire de Paris, CNRS, UPMC, 61 av. de l'Observatoire, 75014 Paris, France.

Optics Letters
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PubMed
Summary

Researchers established a 5 km free-space coherent optical link through atmospheric turbulence. The link

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Area of Science:

  • Optical physics and atmospheric science.

Background:

  • Free-space optical links are crucial for modern communication and sensing.
  • Atmospheric turbulence and mechanical vibrations pose significant challenges to link stability and performance.

Purpose of the Study:

  • To demonstrate a long-distance free-space coherent optical link.
  • To characterize the phase noise and identify its sources in such a link.
  • To explore the potential applications of this technology.

Main Methods:

  • Established a 5 km free-space coherent optical link between a telescope and a ground target.
  • Measured and analyzed the phase noise of the optical signal transmitted through the turbulent atmosphere.
  • Investigated the contributions of atmospheric turbulence and mechanical vibrations to the overall phase noise.

Main Results:

  • Successfully realized a 5 km free-space coherent optical link.
  • Identified atmospheric turbulence and mechanical vibrations as the primary sources of phase noise.
  • Quantified the phase noise characteristics of the link.

Conclusions:

  • The developed free-space coherent optical link is feasible over significant distances despite atmospheric challenges.
  • Understanding and mitigating phase noise is critical for practical applications.
  • The technology shows promise for satellite optical Doppler ranging and long-distance frequency transfer.