I am an academician and an educator. I have more than 45 years of experience in these activities. I mainly work on optical wireless communications in various turbulent media.
2009 WRI World Congress on Computer Science and Information Engineering, 2009
Access telecommunication systems are categorized as digital subscriber line (xDSL), fiber-to-the-... more Access telecommunication systems are categorized as digital subscriber line (xDSL), fiber-to-the-home (FTTH), hybrid fiber-coaxial (HFC), power line systems, local multipoint distribution system (LMDS), free space optics (FSO), satellite and worldwide interoperability for microwave access (WIMAX) systems. Basic specifications, such as the rate of information for upstream and downstream, access link length, frequency licence requirement for these access telecommunication networks are defined. Expert system analysis is applied to find out the possible systems that can be employed among the above mentioned choices of access telecommunication within the user defined inputs describing the requirements of the end user. The rule-based structure of the expert system is formed by using the Exsys expert system development tool.
2012 International Workshop on Optical Wireless Communications (IWOW), 2012
ABSTRACT Transmittance for a Dense Wavelength Division Multiplexing (DWDM) system operating in no... more ABSTRACT Transmittance for a Dense Wavelength Division Multiplexing (DWDM) system operating in non-Kolmogorov medium is evaluated. MODTRAN (MODerate resolution atmospheric TRANsmission) is also used to include the absorption and scattering effects due to atmospheric gases, aerosols and molecules. Increase in the power law of the non-Kolmogorov spectrum is found to decrease the transmittance at all the wavelengths employed in DWDM. Being valid for all the DWDM wavelengths and for all the power law exponent values of non-Kolmogorov spectra, as the turbulence falls into stronger regimes, the transmittance levels decrease.
Correlations of the fields at the receiver plane are evaluated after a symmetrical radial laser a... more 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 same size laser beamlets symmetrically located around a ring having a radius that determines the distance of the ring from the origin. The variations of the correlations of the received field originating from such laser array incidence versus the diagonal length starting from a receiver point are examined for various laser array parameters, turbulence parameters, and the locations of the reception points. Laser array parameters consist of the ring radius and the number and size of the beamlets. Structure constant, link length, and wavelength are the turbulence parameters whose effects on the field correlation of the laser arrays are also investigated.
This conference will bring together scientists and engineers carrying out the theoretical (includ... more This conference will bring together scientists and engineers carrying out the theoretical (including modeling and simulations) and the experimental work relating to interaction of electromagnetic.
The analytical formulae for the wave structure functions (WSF) and the spatial coherence radius o... more The analytical formulae for the wave structure functions (WSF) and the spatial coherence radius of plane and spherical waves propagating through oceanic turbulence are derived. It is found that the Kolmogorov five-thirds power law of WSF is also valid for oceanic turbulence in the inertial range. The changes of the WSF and the spatial coherence radius versus different parameters of oceanic turbulence are examined.
Süper Lorentz ışık hüzmesinin, zayıf türbülanslı atmosfer ortamında yayılımı, genişletilmiş Huyge... more Süper Lorentz ışık hüzmesinin, zayıf türbülanslı atmosfer ortamında yayılımı, genişletilmiş Huygens-Fresnel prensibi kullanılarak, yatay linkler için formüle edildi. Süper Lorentz ışık hüzmesi için alıcı düzlemindeki ışık şiddeti dağılımlarının, düzleştirme parametresi, yayılım ...
In order to analyze the effect of beam type on free space optical communication systems, bit erro... more In order to analyze the effect of beam type on free space optical communication systems, bit error rate (BER) values versus signal-to-noise ratio (SNR) are calculated for zero order and higher order general beam types, namely for Gaussian, cos-Gaussian, cosh-Gaussian, and annular beams. BER analysis is based on optical scintillation using log-normal distribution for the intensity, which is valid in weak atmospheric turbulence. BERs for these beams are plotted under variations of propagation length, source size, wavelength of operation, and order of the beam. According to our graphical outputs, at small source sizes and long propagation distances, the smallest BER value is obtained for the annular beam. On the other hand, at large source size and small propagation distance, the smallest BER value is obtained for the cos-Gaussian beam. Moreover, our study of the order of the beam shows that higher order beams have lower BER values than the zero order beams at longer propagation distances. But this drop compared with the order seems to be incremental.
2009 WRI World Congress on Computer Science and Information Engineering, 2009
Access telecommunication systems are categorized as digital subscriber line (xDSL), fiber-to-the-... more Access telecommunication systems are categorized as digital subscriber line (xDSL), fiber-to-the-home (FTTH), hybrid fiber-coaxial (HFC), power line systems, local multipoint distribution system (LMDS), free space optics (FSO), satellite and worldwide interoperability for microwave access (WIMAX) systems. Basic specifications, such as the rate of information for upstream and downstream, access link length, frequency licence requirement for these access telecommunication networks are defined. Expert system analysis is applied to find out the possible systems that can be employed among the above mentioned choices of access telecommunication within the user defined inputs describing the requirements of the end user. The rule-based structure of the expert system is formed by using the Exsys expert system development tool.
2012 International Workshop on Optical Wireless Communications (IWOW), 2012
ABSTRACT Transmittance for a Dense Wavelength Division Multiplexing (DWDM) system operating in no... more ABSTRACT Transmittance for a Dense Wavelength Division Multiplexing (DWDM) system operating in non-Kolmogorov medium is evaluated. MODTRAN (MODerate resolution atmospheric TRANsmission) is also used to include the absorption and scattering effects due to atmospheric gases, aerosols and molecules. Increase in the power law of the non-Kolmogorov spectrum is found to decrease the transmittance at all the wavelengths employed in DWDM. Being valid for all the DWDM wavelengths and for all the power law exponent values of non-Kolmogorov spectra, as the turbulence falls into stronger regimes, the transmittance levels decrease.
Correlations of the fields at the receiver plane are evaluated after a symmetrical radial laser a... more 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 same size laser beamlets symmetrically located around a ring having a radius that determines the distance of the ring from the origin. The variations of the correlations of the received field originating from such laser array incidence versus the diagonal length starting from a receiver point are examined for various laser array parameters, turbulence parameters, and the locations of the reception points. Laser array parameters consist of the ring radius and the number and size of the beamlets. Structure constant, link length, and wavelength are the turbulence parameters whose effects on the field correlation of the laser arrays are also investigated.
This conference will bring together scientists and engineers carrying out the theoretical (includ... more This conference will bring together scientists and engineers carrying out the theoretical (including modeling and simulations) and the experimental work relating to interaction of electromagnetic.
The analytical formulae for the wave structure functions (WSF) and the spatial coherence radius o... more The analytical formulae for the wave structure functions (WSF) and the spatial coherence radius of plane and spherical waves propagating through oceanic turbulence are derived. It is found that the Kolmogorov five-thirds power law of WSF is also valid for oceanic turbulence in the inertial range. The changes of the WSF and the spatial coherence radius versus different parameters of oceanic turbulence are examined.
Süper Lorentz ışık hüzmesinin, zayıf türbülanslı atmosfer ortamında yayılımı, genişletilmiş Huyge... more Süper Lorentz ışık hüzmesinin, zayıf türbülanslı atmosfer ortamında yayılımı, genişletilmiş Huygens-Fresnel prensibi kullanılarak, yatay linkler için formüle edildi. Süper Lorentz ışık hüzmesi için alıcı düzlemindeki ışık şiddeti dağılımlarının, düzleştirme parametresi, yayılım ...
In order to analyze the effect of beam type on free space optical communication systems, bit erro... more In order to analyze the effect of beam type on free space optical communication systems, bit error rate (BER) values versus signal-to-noise ratio (SNR) are calculated for zero order and higher order general beam types, namely for Gaussian, cos-Gaussian, cosh-Gaussian, and annular beams. BER analysis is based on optical scintillation using log-normal distribution for the intensity, which is valid in weak atmospheric turbulence. BERs for these beams are plotted under variations of propagation length, source size, wavelength of operation, and order of the beam. According to our graphical outputs, at small source sizes and long propagation distances, the smallest BER value is obtained for the annular beam. On the other hand, at large source size and small propagation distance, the smallest BER value is obtained for the cos-Gaussian beam. Moreover, our study of the order of the beam shows that higher order beams have lower BER values than the zero order beams at longer propagation distances. But this drop compared with the order seems to be incremental.
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