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Browsing Mühendislik Fakültesi by Author "Gerçekçioğlu, Hamza"

Now showing items 1-19 of 19

Annular beam scintillations in non-Kolmogorov weak turbulence

Gerçekçioğlu, Hamza; Baykal, Yahya (Springer, 2012-03)

In a weakly turbulent atmosphere governed by the non-Kolmogorov spectrum, the on-axis scintillation index is formulated and evaluated when the incidence is an annular Gaussian type. When the power law of the non-Kolmogorov ...
Annular beam scintillations in strong turbulence

Gerçekçioğlu, Hamza; Baykal, Yahya; Nakiboğlu, Cem (Optical Soc Amer, 2010-08)

A scintillation index formulation for annular beams in strong turbulence is developed that is also valid in moderate and weak turbulence. In our derivation, a modified Rytov solution is employed to obtain the small-scale ...
Application of equivalent structure constant in scintillations and BER found for non-Kolmogorov spectrum

Baykal, Yahya; Gerçekçioğlu, Hamza (Elsevier Science Bv, 2014-01-01)

The evaluation of system parameters in the non-Kolmogorov turbulent atmosphere involves the structure constant valid at the relevant non-Kolmogorov power law exponent. In some of the existing results, the comparisons of ...
Average transmittance in non-Kolmogorov turbulence

Ata, Yalçın; Baykal, Yahya; Gerçekçioğlu, Hamza (Elsevier Science Bv, 2013-09-15)

Average transmittance in non-Kolmogorov turbulence is evaluated. Our recently published equivalent structure constant formulation is employed in our numerical evaluations. At the fixed propagation distance and wavelength, ...
BER of annular and flat-topped beams in non-Kolmogorov weak turbulence

Gerçekçioğlu, Hamza; Baykal, Yahya (Elsevier Science Bv, 2013-01-01)

The average bit error rate (BER) of multi-Gaussian beams in non-Kolmogorov weak turbulence is examined. For each specific incidence of annular and flat-topped optical beam, a power law of non-Kolmogorov spectrum is found ...
BER of annular and flat-topped beams in strong turbulence

Gerçekçioğlu, Hamza; Baykal, Yahya (Elsevier Science Bv, 2013-07-01)

The average bit error rate (< BER >) of annular and flat-topped beams are evaluated in strong turbulence. In this respect, our earlier results on the scintillation indices obtained by the unified Rytov method are employed ...
Ber of Annular Beams in Strong Turbulence

Gerçekçioğlu, Hamza; Baykal, Yahya; Eyyuboğlu, Halil T. (2010)

Bit error rate (BER) of annular beams is found in strong turbulence. Examining effects of beam and medium parameters on BER reveals that annular beams become favorable in stronger turbulence and at smaller focal lengths.
Equivalence of structure constants in non-Kolmogorov and Kolmogorov spectra

Baykal, Yahya; Gerçekçioğlu, Hamza (Optical Soc Amer, 2011-12-01)

We find the equivalence of the structure constants in non-Kolmogorov and Kolmogorov spectra in a turbulent atmosphere. As the reference point, the spherical wave scintillation index in a non-Kolmogorov medium is used. ...
Hermite Gaussian beam scintillations in weak atmospheric turbulence for aerial vehicle laser communications

Sayan, Ömer F.; Gerçekçioğlu, Hamza; Baykal, Yahya (2020-03-01)

Scintillation index of Hermite Gaussian beams used for air vehicle communication systems in vertical paths of weak atmospheric turbulent medium are investigated by employing the modified Rytov method. By evaluating the ...
Intensity fluctuations of flat-topped beam in non-Kolmogorov weak turbulence

Gerçekçioğlu, Hamza; Baykal, Yahya (Optical Soc Amer, 2012-09)

Results obtained on the intensity fluctuations of flat-topped Gaussian beams in weakly turbulent non-Kolmogorov horizontal atmospheric optics links are represented. Effects on the scintillation index of the power law a ...
Intensity fluctuations of laser array beams in non-kolmogorov turbulence

Gerçekçioğlu, Hamza; Baykal, Yahya (IEEE-Inst Electrical Electronics Engineers Inc, 2015-09)

On-axis intensity fluctuations of laser array beams are evaluated when they are used in a weakly turbulent non-Kolmogorov atmosphere. Our formulation of the scintillation index is based on the Rytov method, which in the ...
Laser beam scintillations of LIDAR operating in weak oceanic turbulence

Gerçekçioğlu, Hamza; Baykal, Yahya (2023-01)

The formulation of light detection and ranging (LIDAR) systems is derived and examined for the scintillation index, evaluated on-axis, of laser beams in horizontal links in the ocean with weak turbulence by utilizing the ...
Minimization effects on scintillations of sinusoidal Gaussian beams in strong turbulence

Gerçekçioğlu, Hamza; Baykal, Yahya (IOP Publishing Ltd, 2011-11)

Minimization effects on the on-axis scintillation index of cos Gaussian (cG) and cosh Gaussian (chG) beams are studied in strong turbulence. In our formulation, the unified solution of the Rytov method, which imposes spatial ...
Minimization of scintillation index against displacement parameters

Eyyuboğlu, Halil T.; Gerçekçioğlu, Hamza; Baykal, Yahya (Elsevier Science, 2008-09-01)

For sinusoidal beams, minimization of scintillation index is carried out against the displacements parameters. It is found-that x-y asymmetric cosh-Gaussian beam fulfills the requirements of such optimum beam. Our minimization ...
Minimization of the scintillation index of sinusoidal Gaussian beams in weak turbulence for aerial vehicle-satellite laser communications

Gerçekçioğlu, Hamza; Baykal, Yahya (2021-06-01)

Minimization of the on-axis scintillation index of sinusoidal Gaussian beams is investigated by using the modified Rytov method in weak atmospheric turbulence for uplink/downlink of aerial vehicle-satellite laser communications. ...
Multimode laser beam scintillations in strong atmospheric turbulence

Baykal, Yahya; Gerçekçioğlu, Hamza (Springer Heidelberg, 2019-08)

Multimode laser beam scintillation index is formulated at the origin of the receiver plane (on-axis) in strong atmospheric turbulence using the modified Rytov method. Variations of the scintillation index against the ...
Scintillation and BER for optimum sinusoidal Gaussian beams in weak non-Kolmogorov turbulence

Gerçekçioğlu, Hamza; Baykal, Yahya (Elsevier Science Bv, 2014-06-01)

The scintillation index and the average bit error rate (BER) are evaluated for the optimum sinusoidal Gaussian beams in weak non-Kolmogorov turbulence. The beam parameters that minimize the scintillation index and the ...
Scintillation index of flat-topped Gaussian laser beam in strongly turbulent medium

Gerçekçioğlu, Hamza; Baykal, Yahya (Optical Soc Amer, 2011-08)

In a strongly turbulent medium, the scintillation index of flat-topped Gaussian beams is derived and evaluated. In the formulation, unified solution of Rytov method is utilized. Our results correctly reduce to the existing ...
Transmittance for Dense Wavelength Division Multiplexing system in non-Kolmogorov turbulence

Ata, Yalçın; Baykal, Yahya; Gerçekçioğlu, Hamza (2012)

Transmittance for a Dense Wavelength Division Multiplexing (DWDM) system operating in non-Kolmogorov medium is evaluated. MODTRAN (MODerate resolution atmospheric TRANsmission) is also used to include the absorption and ...

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Browsing Mühendislik Fakültesi by Author "Gerçekçioğlu, Hamza"

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