Elektrik Elektronik Mühendisliği Bölümü Yayın Koleksiyonu: Recent submissions

  • Scintillations of partially coherent annular and flat-topped array beams in extremely strong turbulent medium 
    Öztan, Mehmet A.; Baykal, Yahya (Elsevier Science Bv, 2015-11-01)
    Scintillation index of partially coherent multi-Gaussian array beams is analytically derived and numerically evaluated in extremely strong atmospheric turbulence. In the evaluations, partially coherent annular array and ...
  • Multimode laser beam scintillations in non-kolmogorov turbulence 
    Baykal, Yahya (IEEE-Inst Electrical Electronics Engineers Inc, 2015-09)
    Employing the Rytov solution, the scintillation index at the origin of the receiver plane is evaluated in non-Kolmogorov weak atmospheric turbulence when multimode laser incidence is used. The solution presented can be ...
  • 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 ...
  • Higher order mode laser beam scintillations in oceanic medium 
    Baykal, Yahya (Taylor&Francis Ltd, 2016-01-02)
    In a horizontal oceanic optical wireless communication link, the scintillation index (the measure for the intensity fluctuations) of the received intensity caused by the oceanic turbulence is formulated and evaluated when ...
  • Expressing oceanic turbulence parameters by atmospheric turbulence structure constant 
    Baykal, Yahya (Optical Soc Amer, 2016-02-20)
    The parameters composing oceanic turbulence are the wavelength, link length, rate of dissipation of kinetic energy per unit mass of fluid, rate of dissipation of mean-squared temperature, Kolmogorov microscale, and the ...
  • Higher-order laser beam scintillation in weakly turbulent marine atmospheric medium 
    Baykal, Yahya (Optical Soc Amer, 2016-04-01)
    The atmosphere above the sea or ocean, known as the marine atmosphere, affects optical waves propagating through it in a different manner than the atmosphere above land. Like other system design parameters, intensity ...
  • Fourth-order mutual coherence function in oceanic turbulence 
    Baykal, Yahya (Optical Soc Amer, 2016-04-10)
    We have recently expressed the structure constant of atmospheric turbulence in terms of the oceanic turbulence parameters, which are the ratio of temperature to salinity contributions to the refractive index spectrum, rate ...
  • Scintillation index in strong oceanic turbulence 
    Baykal, Yahya (Elsevier Science Bv., 2016-09-15)
    Scintillation index of spherical wave in strongly turbulent oceanic medium is evaluated. In the evaluation, modified Rytov solution and our recent formulation that expresses the oceanic turbulence parameters by the atmospheric ...
  • BER evaluations for multimode beams in underwater turbulence 
    Altay Arpalı, Serap; Baykal, Yahya; Arpalı, Çağlar (Taylor&Francis Ltd., 2016)
    In underwater optical communication links, bit error rate (BER) is an important performance criterion. For this purpose, the effects of oceanic turbulence on multimode laser beam incidences are studied and compared in terms ...
  • Intensity fluctuations of asymmetrical optical beams in anisotropic turbulence 
    Baykal, Yahya (Optical Soc Amer, 2016-09)
    Intensity fluctuations of asymmetrical optical beams are examined when such beams propagate through anisotropic turbulence. Anisotropic turbulence is modeled by non-Kolmogorov von Karman spectrum. The variations of the ...
  • Cross-beam scintillations in underwater medium 
    Baykal, Yahya (Spie-Soc Photo-Optical Instrumentation Engineers, 2016-11)
    The fluctuation in the intensity, which is quantified by the scintillation index, is evaluated for cross beams when such beams propagate in an underwater medium experiencing turbulence. The variations in the scintillation ...
  • Scintillations of higher order laser beams in anisotropic atmospheric turbulence 
    Baykal, Yahya; Luo, Yujuan; Ji, Xiaoling (Optical Soc Amer, 2016-11-20)
    The scintillation index of higher order laser beams is examined when such beams propagate in anisotropic atmospheric turbulence. Anisotropy is introduced through non-Kolmogorov atmospheric turbulence. The scintillation ...
  • Scintillations of LED sources in oceanic turbulence 
    Baykal, Yahya (Optical Soc Amer, 2016-11-01)
    The scintillation index of light emitting diode (LED) sources is evaluated when such sources are employed in oceanic wireless optical communication (UWOC) links. In the formulation, LED source radiation is taken to be ...
  • 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 ...
  • Performance analysis of multiple-input multiple-output free-space optical systems with partially coherent Gaussian beams and finite-sized detectors 
    Gökçe, Muhsin Caner; Baykal, Yahya; Uysal, Murat (Spie-Soc Photo-Optical Instrumentation Engineers, 2016-11)
    Multiple-input multiple-output (MIMO) techniques are employed in free-space optical (FSO) links to mitigate the degrading effects of atmospheric turbulence. We consider a MIMO FSO system, which consists of a radial laser ...
  • Scintillation analysis of multiple-input single-output underwater optical links 
    Gökçe, Muhsin Caner; Baykal, Yahya (Optical Soc Amer, 2016-08-01)
    Multiple-input single-output (MISO) techniques are employed in underwater wireless optical communication (UWOC) links to mitigate the degrading effects of oceanic turbulence. In this paper, we consider a MISO UWOC system ...
  • Bit error rate analysis of MISO FSO systems 
    Gökçe, Muhsin Caner; Baykal, Yahya; Uysal, Murat (Taylor&Francis Ltd., 2016)
    Multiple-input single-output (MISO) systems are employed in free space optical (FSO) links to mitigate the degrading effects of atmospheric turbulence. In this paper, we consider a MISO FSO system with practical transmitter ...