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Browsing Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu by Publisher

Browsing Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu by Publisher "Optical Soc Amer"

Now showing items 21-40 of 70

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. ...
Equivalent functions for the Fresnel integral

Umul, Yusuf Ziya (Optical Soc Amer, 2005-10-17)

Fresnel integral is modeled with three equivalent functions. The first function is derived by considering the sum of the first term of the Fresnel integral's asymptotic expansion {(F) over cap (x)} and an exponential ...
Evolution of the degree of polarization of an electromagnetic Gaussian Schell-model. beam in a Gaussian cavity

Yao, Min; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya; Korotkova, Olga (Optical Soc Amer, 2008-10-01)

The interaction of an electromagnetic Gaussian Schell-model (EGSM) beam with a Gaussian cavity is analyzed. In particular, the evolution of the degree of polarization of the EGSM beam is investigated. The results show that ...
Fictitious diffracted waves in the diffraction theory of Kirchhoff

Umul, Yusuf Ziya (Optical Soc Amer, 2010-01)

The diffraction theory of Kirchhoff is applied to the semi-infinite aperture of a black half-screen. The derivative of the spherical Green's function is taken into account without any approximation. The uniformly evaluated ...
Field correlation of spherical wave in underwater turbulent medium

Ata, Yalçın; Baykal, Yahya (Optical Soc Amer, 2014-11-20)

The absolute field correlation of the spherical wave in an underwater turbulent medium is investigated at the receiver plane by using the extended Huygens-Fresnel principle. Results denote that increase in the propagation ...
Field correlations of laser arrays in atmospheric turbulence

Baykal, Yahya (Optical Soc Amer, 2014-03-01)

Correlations of the fields at the receiver plane are evaluated after a symmetrical radial laser array beam incident field propagates in a turbulent atmosphere. The laser array configuration is composed of a number of the ...
Formulation of correlations for general-type beams in atmospheric turbulence

Baykal, Yahya (Optical Soc Amer, 2006-04)

Log-amplitude and phase correlations of general-type beams are formulated in atmospheric turbulence. A general beam is described as the superposition of many sets of multimode contents, each mode being off-axis Hermite-Gaussian. ...
Hermite-cosine-Gaussian laser beam and its propagation characteristics in turbulent atmosphere

Eyyuboğlu, Halil T. (Optical Soc Amer, 2005-08)

Hermite-cosine-Gaussian (HcosG) laser beams are studied. The source plane intensity of the HcosG beam is introduced and its dependence on the source parameters is examined. By application of the Fresnel diffraction integral, ...
Hermite-sine-Gaussian and Hermite-sinh-Gaussian laser beams in turbulent atmosphere

Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2005-12)

Hermite-sine-Gaussian and Hermite-sinh-Gaussian laser beam intensities in a turbulent atmosphere are investigated. The received intensity is formulated by applying the extended Huygens-Fresnel principle to generalized ...
Integral representation of the edge diffracted waves along the ray path of the transition region

Umul, Yusuf Ziya (Optical Soc Amer, 2008-09)

The expression of the edge diffracted fields, in terms of the Fresnel integral, is transformed into a path integral. The obtained integral considers the integration of the incident field along the ray path of the transition ...
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 ...
Log-amplitude and phase fluctuations of higher-order annular laser beams in a turbulent medium

Baykal, Yahya (Optical Soc Amer, 2005-04)

Log-amplitude and phase-correlation and structure functions of higher-order annular laser beams in a turbulent atmosphere are derived. A higher-order annular beam source is defined as the superposition of two different ...
M-ary pulse position modulation performance in non-Kolmogorov turbulent atmosphere

Ata, Yalçın; Baykal, Yahya; Gökçe, Muhsin Caner (Optical Soc Amer, 2018-08-20)

The performance of atmospheric optical wireless communication systems in terms of the bit error rate (BER) is investigated when a Gaussian laser beam propagating in non-Kolmogorov turbulence is M-ary pulse-position-modulated ...
Modeling of an interface between isorefractive media by a resistive surface

Başdemir, Hüsnü Deniz (Optical Soc Amer, 2018-02-20)

In this study, the scattering of plane waves by a half-plane with different face impedances, which lie between isorefractive media, is analyzed. A new approach for the solution of this scenario is proposed. According to ...
Modified diffraction theory of Kirchhoff

Umul, Yusuf Ziya (Optical Soc Amer, 2008-08)

The diffraction theory of Kirchhoff is reinterpreted and a new form of a surface diffraction integral is developed by using the axioms of the modified theory of physical optics, which leads to the exact scattered fields ...
Modified theory of physical optics

Umul, Yusuf Ziya (Optical Soc Amer, 2004-10-04)

A new procedure for calculating the scattered fields from a perfectly conducting body is introduced. The method is defined by considering three assumptions. The reflection angle is taken as a function of integral variables, ...
Modified theory of physical optics approach to wedge diffraction problems

Umul, Yusuf Ziya (Optical Soc Amer, 2005-01-10)

The problem of diffraction from a perfectly conducting wedge is examined with the modified theory of physical optics (MTPO). The exact wedge diffraction coefficient is compared with the asymptotic edge waves of MTPO integral ...
Modified theory of the physical-optics approach to the impedance wedge problem

Umul, Yusuf Ziya (Optical Soc Amer, 2006-02-01)

The problem of a wedge with equal face impedances is examined with a modified theory of physical optics. The surface integral is constructed by use of the impedance boundary condition. The aperture equivalent current is ...
Performance of M-ary pulse position modulation for aeronautical uplink communications in an atmospheric turbulent medium

Ata, Yalçın; Baykal, Yahya; Gökçe, Muhsin Caner (Optical Soc Amer, 2019-10-01)

This paper discusses the bit-error-rate (BER) performance of an aeronautical uplink optical wireless communication system (OWCS) when a Gaussian beam is employed and the M-ary pulse position modulation technique is used ...
Physical optics theory for the diffraction of waves by impedance surfaces

Umul, Yusuf Ziya (Optical Soc Amer, 2011-02)

The solution of the scattering problem of waves by a half-screen with equal face impedances, which was introduced by Malyughinetz, is transformed into a physical optics integral by using the inverse edge point method. The ...

Now showing items 21-40 of 70

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Browsing Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu by Publisher "Optical Soc Amer"

Browsing Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu by Publisher "Optical Soc Amer"

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