&lt;title&gt;Mitigation of aberration in a beam-shaping telescope and optical inhomogeinity in a free-space optical path using an extended light source coupled to the telescope&lt;/title&gt;

Sidorovich, V. G.; Ragulsky, V. V.; Vasil'ev, Michael V.; Leshchev, Alexey; Sadovnikov, M.

doi:10.1117/12.464099

Cited by 7 publications

(4 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[1][2][3][4][5][6][7][8][9] Although it was theoretically understood before that partially coherent beams are affected less by atmospheric turbulence compared with perfectly coherent beams, 10 the efficient mathematical tools are not yet developed to carry this analysis over to the design of optical systems for communication links with required quality. In this paper, we establish the theoretical model for the calculation of the scintillation index of the partially coherent Gaussian beam in turbulence and demonstrate that it can provide such a tool for optical systems of different complexity and for a variety of atmospheric spectrum models.…”

Section: Introductionmentioning

confidence: 98%

Model for a partially coherent Gaussian beam in atmospheric turbulence with application in Lasercom

Korotkova

2004

Opt. Eng

211

View full text Add to dashboard Cite

Analytic expressions for the mutual coherence function (MCF) and the scintillation index of a partially coherent lowest order Gaussian beam wave propagating through the atmosphere (based on Kolmogorov spectrum model) are developed for the pupil plane of a receiving system. Partial coherence of the beam is modeled as a thin (complex) phase screen with Gaussian spectrum (Rytov theory and ABCD ray matrices are applied). The relation between the second-and fourth-order statistics for a beam with any degree of coherence in the atmosphere is introduced with the help of ''effective'' beam parameters, deduced from the free-space MCF. In particular, the scintillation (in weak and strong atmospheric conditions), based on these parameters, is studied as a function of the diffuser's strength and that of the atmosphere. The model is applied for the calculation of the SNR and bit error rates (OOK modulation) of the communication link with diffuser at the transmitter and slow detection system. The improvement of bit error rates is observed in weak and strong atmospheric turbulence. In the weak regime, the optimal diffuser can be found. © 2004 Society of Photo-Optical Instrumentation Engineers.

show abstract

Section: Introductionmentioning

confidence: 98%

Model for a partially coherent Gaussian beam in atmospheric turbulence with application in Lasercom

Korotkova

2004

Opt. Eng

211

View full text Add to dashboard Cite

show abstract

“…Phase screen diffuser which well known as partially coherent beam improve the laser performance in communication system has taken an interest recently [1][2][3][4]. The conventional FSO using the pefectly coherence beam suffers from the various weather in the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Enhance the Performance of Free Space Optical (FSO) Communication due to Atmospheric Turbulence via the Dual Diffuser Modulation (DDM)

Rahman

Aljunid

Anuar

et al. 2013

KEM

View full text Add to dashboard Cite

This paper focus on mitigating the atmospheric turbulence effect in free space optical communication using dual diffuser modulation (DDM) technique. Phase screen diffuser located on transmitter create 'new' beam wave to propagate through turbulence more efficiently. This technique uses two transmitter and differential mode detection at the receiver. The numerical result show that the DDM produce better performance compare to conventional FSO that using intensity modulation/direct detection (IM/DD) for On-Off Keying Modulation (OOK). The reduction in the scintillation level also improve in DDM compare to conventional technique that using a perfectly coherence beam.

show abstract

“…The interest in the (spatially) partially coherent beam as a tool improving the performance of the laser communication systems was indicated recently in a number of publications [1][2][3][4]. Although the theoretical foundations of partial coherence in free space were established in early 60s [5,6] there is still a lack of knowledge about the behavior of partially coherent beams in the atmospheric turbulence.…”

Section: Introductionmentioning

confidence: 99%

Phase diffuser at the transmitter for lasercom link: effect of partially coherent beam on the bit-error rate

Korotkova

Andrews

Phillips³

2003

Atmospheric Propagation

View full text Add to dashboard Cite

By using a complex phase screen model for a diffuser located at the transmitter, analytic expressions are developed for the scintillation index of a lowest order Gaussian-beam wave in the pupil plane of the receiver in weak and strong atmospheric conditions. The effect of partial coherence on the scintillation index is analyzed as a function of the propagation distance and the correlation length of the diffuser. The reduction in the scintillation level (due to the transmitter aperture averaging effect) is shown under all atmospheric conditions. The signal to noise ratio and the bit error rates (for OOK signal modulation) are discussed.

show abstract

<title>Mitigation of aberration in a beam-shaping telescope and optical inhomogeinity in a free-space optical path using an extended light source coupled to the telescope</title>

Cited by 7 publications

References 1 publication

Model for a partially coherent Gaussian beam in atmospheric turbulence with application in Lasercom

Model for a partially coherent Gaussian beam in atmospheric turbulence with application in Lasercom

Enhance the Performance of Free Space Optical (FSO) Communication due to Atmospheric Turbulence via the Dual Diffuser Modulation (DDM)

Phase diffuser at the transmitter for lasercom link: effect of partially coherent beam on the bit-error rate

Contact Info

Product

Resources

About