&lt;title&gt;Fiber coupling with adaptive optics for free-space optical communication&lt;/title&gt;

Weyrauch, Thomas; Vorontsov, Mikhail A.; Gowens, John W.; Bifano, Thomas G.

doi:10.1117/12.453227

Cited by 51 publications

(21 citation statements)

References 9 publications

(5 reference statements)

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“…When both β and D are fixed, in the case of ζ 1, Eq. (19) is also assumed to be equivalent to the previous equation of η C in Refs. [12] and [13] because of the same spatial coherent radius obtained, which is not presented here.…”

Section: Analysis Of Spatial Coherent Radiusmentioning

confidence: 99%

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Fiber-coupling efficiency of Gaussian Schell model for optical communication through atmospheric turbulence

Tan

Yang

et al. 2015

Appl. Opt.

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In practice, due to the laser device and the inevitable error of the processing technique, the laser source emitted from the communication terminal is partially coherent, and is represented as a Gaussian Schell model (GSM). The cross-spectral density function based on the Gaussian model in previous research is replaced by the GSM. Thus the fiber-coupling efficiency equation of the GSM laser source through atmospheric turbulence is deduced. The GSM equation presents the effect of the source coherent parameter ζ on the fiber-coupling efficiency, which was not included previously. The effects of the source coherent parameter ζ on the spatial coherent radius and the fiber-coupling efficiency through atmospheric turbulence are numerically simulated and analyzed. The result manifests that the fiber-coupling efficiency invariably degrades with increasing ζ. The work in this paper is aimed to improve the redundancy design of fiber-coupling receiver systems by analyzing the fiber-coupling efficiency with the source coherent parameters.

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Section: Analysis Of Spatial Coherent Radiusmentioning

confidence: 99%

“…A host of research has focused on the fiber-coupling efficiency of the SMF [12][13][14][15][16][17][18][19][20][21]. The fiber-coupling efficiency of an ideally coherent laser source through atmospheric turbulence has been discussed previously, and the results have been applied to lidar and free-space optical communication [12,13].…”

Section: Introductionmentioning

confidence: 99%

Fiber-coupling efficiency of Gaussian Schell model for optical communication through atmospheric turbulence

Tan

Yang

et al. 2015

Appl. Opt.

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“…In 1997, Vorontsov and colleagues at the U.S. Army Research Laboratory used this algorithm in adaptive optical imaging and achieved major success [22][23][24], after which it was formally named the stochastic parallel gradient descent (SPGD) algorithm. Its relatively traditional optimization method has the obvious advantage of rapid convergence, and it is currently used in research and applications in many different fields such as free-space visible light communication [25], VLSI microchips [26,27], fiber optic array phase lockers [28], synthesis pore adaptive imaging [29], and laser communications [30].…”

Section: Introductionmentioning

confidence: 99%

Two-step camera calibration method based on the SPGD algorithm

Zheng¹,

Liu²,

et al. 2012

Appl. Opt.

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Given the rapid convergence characteristic of the stochastic parallel gradient descent (SPGD) algorithm, this study proposes a method that applies the algorithm to a two-step camera calibration method to resolve the frequent iteration and long calibration time deficiencies that exist under the traditional two-step camera calibration method, thereby achieving rapid calibration. The method first uses image coordinates obtained with subpixel positioning technology as initial values of control variables, in addition to positive disturbances produced on a two-dimensional plane, then uses two-step theory to calculate the average value of aberrations. Based on the same rationale, negative disturbances are then produced and the average value of the aberrations is calculated. Finally if, after assessing whether to continue with further iterations based on the difference in these values, continued iterations confirm new control variables based on the SPGD algorithm iteration formula, a new cycle is started until the results satisfy requirements. Theoretical analysis and experimental results show that the proposed rapid calibration method using the SPGD algorithm in the two-step camera calibration method is 3-4 times faster than the traditional two-step calibration method, and that it has significant potential value for use in certain time-constrained projects.

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“…They demonstrated a 12 dB improvement in the coupling efficiency in laboratory with this system. A similar system was also used to compare blind optimization with a conventional AO system based on wavefront conjugation, and it was found that using the coupling efficiency as a feedback signal in the AO system could provide better results [2].…”

mentioning

confidence: 99%

Modal correction for fiber-coupling efficiency in free-space optical communication systems through atmospheric turbulence

Yan

2010

Optik

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<title>Fiber coupling with adaptive optics for free-space optical communication</title>

Cited by 51 publications

References 9 publications

Fiber-coupling efficiency of Gaussian Schell model for optical communication through atmospheric turbulence

Fiber-coupling efficiency of Gaussian Schell model for optical communication through atmospheric turbulence

Two-step camera calibration method based on the SPGD algorithm

Modal correction for fiber-coupling efficiency in free-space optical communication systems through atmospheric turbulence

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