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

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

Research output: Contribution to journalArticle

79 Citations (Scopus)

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

Fingerprint

free-space optical communication
atmospheres
scintillation
turbulence
optical communication
laser beams
detectors
approximation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Optimized multiemitter beams for free-space optical communications through turbulent atmosphere. / Polynkin, Pavel G; Peleg, Avner; Klein, Laura; Rhoadarmer, Troy; Moloney, Jerome V.

In: Optics Letters, Vol. 32, No. 8, 15.04.2007, p. 885-887.

Research output: Contribution to journalArticle

@article{677ba1e5768147e4904d2facf2508031,
title = "Optimized multiemitter beams for free-space optical communications through turbulent atmosphere",
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.",
author = "Polynkin, {Pavel G} and Avner Peleg and Laura Klein and Troy Rhoadarmer and Moloney, {Jerome V}",
year = "2007",
month = "4",
day = "15",
doi = "10.1364/OL.32.000885",
language = "English (US)",
volume = "32",
pages = "885--887",
journal = "Optics Letters",
issn = "0146-9592",
publisher = "The Optical Society",
number = "8",

}

TY - JOUR

T1 - Optimized multiemitter beams for free-space optical communications through turbulent atmosphere

AU - Polynkin, Pavel G

AU - Peleg, Avner

AU - Klein, Laura

AU - Rhoadarmer, Troy

AU - Moloney, Jerome V

PY - 2007/4/15

Y1 - 2007/4/15

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=33947373385&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33947373385&partnerID=8YFLogxK

U2 - 10.1364/OL.32.000885

DO - 10.1364/OL.32.000885

M3 - Article

C2 - 17375142

AN - SCOPUS:33947373385

VL - 32

SP - 885

EP - 887

JO - Optics Letters

JF - Optics Letters

SN - 0146-9592

IS - 8

ER -