DSpace@Çankaya

Yazar "7812" için Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu listeleme

Yazar "7812" için Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu listeleme

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  • Active laser radar systems with stochastic electromagnetic beams in turbulent atmosphere 
    Cai, Yangjian; Korotkova, Olga; Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2008-09-29)
    Propagation of stochastic electromagnetic beams through paraxial ABCD optical systems operating through turbulent atmosphere is investigated with the help of the ABCD matrices and the generalized Huygens-Fresnel integral. ...
  • Adaptive Optics Correction of Scintillation in Underwater Medium 
    Baykal, Yahya (Taylor&Francis LTD, 2020-02-06)
    Adaptive optics correction of the scintillation index of a Gaussian laser beam in underwater turbulence is studied. To introduce the adaptive optics correction, filter functions providing the piston, tilt and astigmatism ...
  • Analysis of laser multimode content on the angle-of-arrival fluctuations in free-space optics access systems 
    Eyyuboğlu, Halil T.; Baykal, Yahya (Spie-Soc Photo-Optical Instrumentation Engineers, 2005-05)
    The effects of laser beam multimode content on the angle-of-arrival fluctuations are examined for free-space optics (FSO) access systems. Multimode excitation is represented by coherent addition of Hermite-Gaussian modes. ...
  • Analysis of reciprocity of cos-Gaussian and cosh-Gaussian laser beams in a turbulent atmosphere 
    Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2004-10-04)
    In a turbulent atmosphere, starting with a cos-Gaussian excitation at the source plane, the average intensity profile at the receiver plane is formulated. This average intensity profile is evaluated against the variations ...
  • Angle-of-arrival fluctuations for general-type beams 
    Eyyuboğlu, Halil T.; Baykal, Yahya (Spie-Soc Photo-Optical Instrumentation Engineers, 2007-09)
    Starting with the recently introduced phase correlation function of a general-type beam, the angle-of-arrival fluctuations are derived and evaluated in atmospheric turbulence for lowest-order Gaussian, cos-Gaussian, ...
  • 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 ...
  • Aperture averaging in multiple-input single-output free-space optical systems 
    Gökçe, Muhsin Caner; Baykal, Yahya; Uysal, Murat (Optical Soc Amer, 2016-06-01)
    Multiple-input single-output (MISO) techniques are employed in free-space optical (FSO) links to mitigate the degrading effects of atmospheric turbulence. In this paper, for the MISO FSO system, a partially coherent radial ...
  • Aperture averaging in multiple-input single-output free-space optical systems 
    Gökçe, Muhsin Caner; Baykal, Yahya; Kamacıoğlu, Canan; Uysal, Murat (Spie-Soc Photo-Optical Instrumentation Engineers, 2015-06)
    Multiple-input single-output systems are employed in free-space optical links to mitigate the degrading effects of atmospheric turbulence. We formulate the power scintillation as a function of transmitter and receiver ...
  • Aperture Averaging of Focused Multi-Gaussian Beams 
    Kamacıoğlu, Canan; Baykal, Yahya; Yazgan, Erdem (Electromagnetics Acad, 2013)
    We investigate the behavior of the power fluctuations of the focused annular and flat-topped beams when a realistic receiver possessing a finite sized aperture is employed in turbulent atmospheric optics links. Employing ...
  • 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 ...
  • Arbitrary laser beam propagation in free space 
    Arpalı, Çağlar; Baykal, Yahya; Nakiboğlu, Cem (Elsevier Science, 2009-08-15)
    The propagation of arbitrary laser beams in free space is examined. For this purpose, starting with an incident field of arbitrary field distribution, the intensity at the receiver plane is formulated via Huygens Fresnel ...
  • Average intensity and spreading of an elegant Hermite-Gaussian beam in turbulent atmosphere 
    Yuan, Yangsheng; Cai, Yangjian; Qu, Jun; Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2009-06-22)
    The propagation of an elegant Hermite-Gaussian beam (EHGB) in turbulent atmosphere is investigated. Analytical propagation formulae for the average intensity and effective beam size of an EHGB in turbulent atmosphere are ...
  • Average intensity and spreading of cosh-Gaussian laser beams in the turbulent atmosphere 
    Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2005-02-20)
    The average intensity and spreading of cosh-Gaussian laser beams in the turbulent atmosphere are examined. Our research is based principally on formulating the average-intensity profile at the receiver plane for cosh-Gaussian ...
  • Average intensity and spreading of partially coherent standard and elegant Laguerre-Gaussian beams in turbulent atmosphere 
    Wang, F.; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya (E M W Publishing, 2010)
    Analytical expressions for the average intensity, mean-squared beam width and angular spread of partially coherent standard and elegant Laguerre-Gaussian (LG) beams propagating in turbulent atmosphere are derived. The ...
  • Average irradiance and polarization properties of a radially or azimuthally polarized beam in a turbulent atmosphere 
    Cai, Yangjian; Qiang, Lin; Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Society of America, 2008-05-26)
    Analytical formulas are derived for the average irradiance and the degree of polarization of a radially or azimuthally polarized doughnut beam (PDB) propagating in a turbulent atmosphere by adopting a beam coherence-polarization ...
  • Average received intensity for optical beam of arbitrary field profile after propagation in turbulent atmosphere 
    Arpalı, Çağlar; Baykal, Yahya (Spie-Int Soc Optical Engineering, 2009)
    Employing our previously obtained formulation of the average received intensity for arbitrary optical beam in turbulent atmosphere, intensity patterns of already known and new source profiles are obtained. Arbitrary beam ...
  • 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, ...
  • Averaging of receiver aperture for flat-topped incidence 
    Kamacıoğlu, Canan; Baykal, Yahya; Yazgan, Erdem (Elsevier Science Ltd, 2013-11)
    Using a flat-topped profile for the incident beam, the power scintillation index for weak atmospheric turbulence is formulated and analytically evaluated. Through the use of the aperture averaging factor, the averaging ...
  • Beam wander characteristics of cos and cosh-Gaussian beams 
    Çil, Celal Zaim; Eyyuboğlu, Halil T.; Baykal, Yahya; Cai, Yangjian (Springer, 2009-06)
    Within the context of a general beam formulation, beam wander characteristics of cos and cosh-Gaussian beams are derived and numerically evaluated. In our graphs, the fundamental Gaussian beam is used as a benchmark for ...