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Browsing Elektrik Elektronik Mühendisliği Bölümü by Subject "Atmospheric Turbulence"

Now showing items 1-20 of 27

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 ...
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. ...
Beam wander of J 0- and i 0-Bessel Gaussian beams propagating in turbulent atmosphere

Çil, C.Z.; Eyyuboğlu, H.T.; Baykal, Y.; Korotkova, O.; Cai, Y. (2010-01)

Root mean square (rms) beam wander of J 0-Bessel Gaussian and I 0-Bessel Gaussian beams, normalized by the rms beam wander of the fundamental Gaussian beam, is evaluated in atmospheric turbulence. Our formulation is based ...
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 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 ...
Correlation of multimode fields in atmospheric turbulence

Baykal, Yahya; Gökçe, Muhsin Caner; Ata, Yalçın; Gerçekcioğlu, Hamza (2023-03)

Multimode field correlations are evaluated in atmospheric turbulence. High order field correlations are special cases of the results that we obtained in this paper. Field correlations are presented for various numbers of ...
Effect of partial coherence on signal-to-noise ratio performance of free space optical communication system in weak turbulence

Akbucak, Volkan; Aymelek, Görkem; Yolcu, Begüm; Kayam, Orkun; Ünal, Onur; Gökçe, Muhsin Caner; Baykal, Yahya (2022-09-01)

The effect of source coherence on the average signal-to-noise ratio SNR performance of free space optical communication (FSOC) systems operating in weak atmospheric turbulence is investigated with the help of the extended ...
Effects of laser multimode content on the angle-of-arrival fluctuations in free space optics access systems

Eyyuboğlu, Halil T.; Baykal, Yahya (Spie-Int Soc Optical Engineering, 2004)

The effects of the multimode content in a laser beam 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 ...
Error performance of optical wireless communication systems exercising BPSK subcarrier intensity modulation in non-Kolmogorov turbulent atmosphere

Ata, Yalçın; Baykal, Yahya; Gökçe, Muhsin Caner (Elsevier Science BV, 2019-04-01)

Subcarrier intensity modulation (SIM) scheme is preferred due to efficient bandwidth usage superiority over other modulation techniques such as on-off keying (OOK), pulse position modulation (PPM). In this paper, we ...
Fiber-Coupling Efficiency of Laser Array Beam From Turbulent Atmosphere to Fiber Link

Gökçe, Muhsin Caner; Baykal, Yahya; Ata, Yalçın (2023-01-01)

Free-space optical communication (FSOC) systems are nowadays integrated with fiber optical components developed for fiber-optic communications. In such integrated systems, the collected portion of the incident beam on the ...
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 ...
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 ...
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 ...
Influence of Atmospheric Turbulence on Quality of Multichannel Laser Radiation and Correction for Distortion

Kanev, F. Yu.; Lukin, V. P.; Makenova, N. A.; Antipov, Oleg; Eyyuboğlu, Halil T. (SPIE, 2016)

In this paper the results of simulation are presented of multichannel radiation propagation in the atmosphere, and correction for turbulent distortion on the base of the beam phase control is considered. The results ...
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 ...
Intensity Fluctuations of Incoherently Superposed Gaussian Beams In Atmospheric Turbulence

Baykal, Yahya (Spie-Int Soc Optical Engineering, 2010)

Intensity fluctuations of incoherently superposed Gaussian beams are formulated in weak turbulence by employing the extended Huygens-Fresnel principle. Each individual beam superposed is taken to be fully incoherent. The ...
Intensity fluctuations of multimode laser beams in underwater medium

Baykal, Yahya (Optical Soc Amer, 2015-04)

In an oceanic optical communications link, the received intensity fluctuations, quantified by the scintillation index, are formulated and evaluated when a multimode laser is used. The variations of the scintillation index ...
M-ary pulse position modulation performance with adaptive optics corrections in atmospheric turbulence

Ata, Yalçın; Gökçe, Muhsin Caner; Baykal, Yahya (2020-03-29)

The performance of M-ary pulse position modulated (PPM) optical wireless communication (OWC) systems in atmospheric weak turbulence medium is evaluated by using adaptive optics corrections. Piston, tilt, defocus and coma ...
Mitigation of atmospheric turbulence on up and downlink optical communication systems using receiver diversity and adaptive optics

Yalçın, Ata; Gökçe, Muhsin Caner; Baykal, Yahya (2022-10)

Improvement in the performance of uplink and downlink optical communication systems by means of receive diversity and adaptive optics correction is investigated. We develop a communication system model using adaptive optics ...

Now showing items 1-20 of 27

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Browsing Elektrik Elektronik Mühendisliği Bölümü by Subject "Atmospheric Turbulence"

Browsing Elektrik Elektronik Mühendisliği Bölümü by Subject "Atmospheric Turbulence"

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