Optimized multiemitter beams for free-space optical communications through turbulent atmosphere

Pavel Polynkin, Avner Peleg, Laura Klein, Troy Rhoadarmer, Jerome Moloney

Research output: Contribution to journalArticle

82 Scopus citations

Abstract

Using laser beams with less than perfect spatial coherence is an effective way of reducing scintillations in free-space optical communication links. We report a proof-of-principle experiment that quantifies this concept for a particular type of a partially coherent beam. In our scaled model of a free-space optical communication link, the beam is composed of several partially overlapping fundamental Gaussian beams that are mutually incoherent. The turbulent atmosphere is simulated by a random phase screen imprinted with Kolmogorov turbulence. Our experiments show that for both weak-to-intermediate and strong turbulence an optimum separation between the constituent beams exists such that the scintillation index of the optical signal at the detector is minimized. At the minimum, the scintillation reduction factor compared with the case of a single Gaussian beam is substantial, and it is found to grow with the number of constituent beams. For weak-to-intermediate turbulence, our experimental results are in reasonable agreement with calculations based on the Rytov approximation.

Original languageEnglish (US)
Pages (from-to)885-887
Number of pages3
JournalOptics letters
Volume32
Issue number8
DOIs
StatePublished - Apr 15 2007

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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