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Browsing Elektrik Elektronik Mühendisliği Bölümü Yayın Koleksiyonu by Author "Baykal, Yahya"

Now showing items 1-20 of 97

Adaptive optics correction of beam spread in biological tissues

Baykal, Yahya (2022-06)

Beam spread in turbulent biological tissues is examined when the tissue is excited with a collimated Gaussian laser beam. Adaptive optics correction is applied to the beam spread in the form of piston only (P Only), tilt ...
Adaptive optics corrections of scintillations of Hermite-Gaussian modes in an oceanic medium

Baykal, Yahya (2020-06-01)

Adaptive optics correction of the scintillation index is found when Hermite-Gaussian laser beams are used in oceanic turbulence. Adaptive optics filter functions are used to find how the tilt, focus, astigmatism, coma, and ...
Adaptive optics effect on performance of BPSK-SIM oceanic optical wireless communication systems with aperture averaging in weak turbulence

Gökçe, Muhsin Caner; Baykal, Yahya; Ata, Yalçın (2020-11)

Turbulence-induced wavefront deformations cause the irradiance of an optical signal to fluctuate resulting a in serious degradation in the bit-error-rate (BER) performance of optical wireless communication (OWC) system. ...
Analysis of Field Correlations in Atmospheric Optical MIMO Systems

Baykal, Yahya; Uysal, Murat (IEEE, 2014)

In this paper, we evaluate the absolute field correlations for a free space optical (FSO) multiple-input multiple-output (MIMO) link operating in a turbulent atmosphere. Such knowledge is needed in heterodyne reception to ...
Analysis of wander and spreading of an optical beam by using the oceanic turbulence optical power spectrum

Ata, Yalçın; Baykal, Yahya; Gökçe, Muhsin Caner (2022-08)

Variance of beam displacement and short-term and long-term spreading of a Gaussian beam propagating in the presence of underwater turbulence are examined by using the oceanic turbulence optical power spectrum (OTOPS). ...
Anisotropic non-Kolmogorov turbulence effect on transmittance of multi-Gaussian beam

Ata, Yalçın; Baykal, Yahya (2020-01-02)

The effect of anisotropic non-Kolmogorov turbulent atmosphere on multi-Gaussian beam is investigated and the results are presented against different beam and medium parameters. Results show that anisotropy increases the ...
Anisotropy effect on multi-Gaussian beam propagation in turbulent ocean

Ata, Yalçın; Baykal, Yahya (Chinese Laser Press, 2018-08-10)

Average transmittance of multi-Gaussian (flat-topped and annular) optical beams in an anisotropic turbulent ocean is examined analytically based on the extended Huygens-Fresnel principle. Transmittance variations depending ...
Anisotropy effect on performance of PPM optical wireless oceanic communication links

Baykal, Yahya (Pergamon-Elsevier Science LTD, 2019-05)

The performance, quantified by the bit-error-rate (BER), of M-ary pulse position modulated (PPM) optical wireless oceanic communication (OWOC) link is investigated when such a link operates in anisotropic weak oceanic ...
Anisotropy effect on performance of subcarrier intensity modulated binary phase shift keying optical wireless communication links in weakly turbulent underwater channel

Baykal, Yahya; Gökçe, Muhsin Caner; Ata, Yalçın (Taylor&Francis LTD, 2019-10)

The effect of the anisotropy on the bit-error-rate (BER) performance of subcarrier intensity modulated (SIM) binary phase shift keying (BPSK) optical wireless communication (OWC) links operating in weakly turbulent underwater ...
Aperture averaging and BER for Gaussian beam in underwater oceanic turbulence

Gökçe, Muhsin Caner; Baykal, Yahya (Elsevier Science BV, 2018-03-01)

In an underwater wireless optical communication (UWOC) link, power fluctuations over finite-sized collecting lens are investigated for a horizontally propagating Gaussian beam wave. The power scintillation index, also known ...
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 in strong oceanic turbulence

Gökçe, Muhsin Caner; Baykal, Yahya (Elsevier Science BV, 2018-04-15)

Receiver aperture averaging technique is employed in underwater wireless optical communication (UWOC) systems to mitigate the effects of oceanic turbulence, thus to improve the system performance. The irradiance flux ...
Application of adaptive optics on bit error rate of M-ary pulse-position-modulated oceanic optical wireless communication systems

Baykal, Yahya; Gökçe, Muhsin Caner; Ata, Yalçın (2020-07)

An adaptive optics correction arising from the sum of tilt, focus, astigmatism and coma components is applied to the bit error rate (BER) of M-ary pulse-position-modulated (PPM) oceanic optical wireless communication ...
Average channel capacity in anisotropic atmospheric non-Kolmogorov turbulent medium

Ata, Yalçın; Baykal, Yahya; Gökçe, Muhsin Caner (Elsevier, 2019-11-15)

The average channel capacity of a free space optical (FSO) communication system running an intensity modulated Gaussian beam is examined in anisotropic non-Kolmogorov atmospheric weak turbulence based on Rytov variance. ...
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 ...
BER of asymmetrical optical beams in oceanic and marine atmospheric media

Baykal, Yahya (Elsevier Science Bv, 2017-06-15)

The average bit-error-rate (BER) performances of asymmetrical optical Gaussian beams propagating in oceanic and marine atmospheric turbulence are examined. Both type of media are assumed to exhibit weak turbulence. The ...
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 ...
Bit error rate of pulse position modulated optical wireless communication links in oceanic turbulence

Baykal, Yahya (Optical Soc Amer, 2018-09-01)

The upper bound of the average bit error rate (BER) of a pulse position modulated (PPM) optical wireless communication (OWC) link operating in oceanic turbulence is formulated. BER variations against the changes in the ...
Bit-error-rate performance of optical wireless system using higher order mode laser in anisotropic non-Kolmogorov turbulence

Yalçın, Ata; Baykal, Yahya (Spie-Soc Photo-Optical Instrumentation Engineers, 2018-05)

The average bit-error-rate, (BER), of optical wireless system using higher order mode laser beam is investigated when atmospheric turbulence shows anisotropic and non-Kolmogorov characteristics. Results reveal that increase ...

Now showing items 1-20 of 97

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Browsing Elektrik Elektronik Mühendisliği Bölümü Yayın Koleksiyonu by Author "Baykal, Yahya"

Browsing Elektrik Elektronik Mühendisliği Bölümü Yayın Koleksiyonu by Author "Baykal, Yahya"

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