Fyath raad sami (68 risultati)

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Paperback. Condizione: Brand New. 188 pages. 8.66x5.91x0.43 inches. In Stock.

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Taschenbuch. Condizione: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - This work addresses theoretically some issues related to CO-OFDM system and identifies some parameters that affect its performance. The performance of a long-haul CO-OFDM system is simulated taking into account the effect of fiber chromatic dispersion, polarization mode dispersion, and nonlinear fiber optic effects. A theoretical study regarding the relation between the number of subcarriers and the mean launched optical power is carried out and supported by simulation results. The study reveals that there is an optimum launched power value for a fixed number of subcarriers. Further, The inphase/quadrature (I/Q) amplitude and phase imbalance effects are studied in CO-OFDM and an analytical model for the I/Q imbalance is developed and supported by simulation results. The results indicate that the I/Q imbalance degrades the BER performance considerably.Simulation results are obtained using OptiSystem (version 9.0) software package.…

Taschenbuch. Condizione: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - Comprehensive numerical model is developed to investigate the characteristics of FWM in silicon nanowire waveguides. The model is based on a set of coupled nonlinear Schrödinger equations describing the propagation of the pump, signal, and converted waveform through the waveguide. The effect of dispersion, free-carrier absorption, two-photon absorption, and state of polarization are taken into account. Analytical solutions are also deduced from the model under simplified conditions to get approximated description for the key roles played by various system parameters. Both numerical and analytical models are applied to four silicon nanowire waveguides, differ in their cross section dimensions, to assess their FWM-based wavelength conversion characteristics. The polarization-dependent parameters of these waveguides are included in the modeling. The effect of pump power, waveguide length, and wavelength shift on conversion efficiency are addressed in details. The investigation is carried further by simulating the performance of these wavelength converters in optical communication systems using Optisystem software.…

Condizione: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Al-Qadi Mustafa Alaulddin BahaulddinMr. Al-Qadi obtained the BSc and MSc degrees in Electronic and Communications Engineering from ALnahrain University(Baghdad, Iraq) in 2008 and 2011, respectively. He servied as a team leader in H.…

Taschenbuch. Condizione: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - Four-level rate equation model is used to describe the carrier dynamics in quantum dot (QD) semiconductor optical amplifiers (SOAs) which takes into account the effect of QD continuum state. A phenomenological description is used to model the intradot carrier scattering between discrete quantum dot states and the continuum state. Analytical results are presented for the small-signal response of wavelength conversion based on the four-wave mixing and cross gain modulation in these advanced amplifiers.…

Taschenbuch. Condizione: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - In recent years, there is increasing interest in using dual-polarization (DP) technique to enable future systems with at least 100 Gb/s rate per channel to operate over existing optical networks. The performance of these advanced systems can be enhanced further by using CO-OFDM technique which offers high spectral efficiency and outstanding tolerance of fiber dispersion.This work addresses the effect of fiber nonlinear optics on the performance of dual polarization CO-OFDM/WDM system operating with 100 Gb/s per channel. Different modulation formats, namely BPSK, QPSK and 16-QAM, are used. First, the performance of a single-channel system is investigated in the absence and presence of fiber nonlinearity. The results are compared with a conventional (single-polarization) system to identify the key role played by the DP technique. The investigation is then extended to WDM systems incorporating DP-OFDM technique. The results reveal that the effect of fiber nonlinearity can be reduced by using optimum transmitter laser power Popt. Further, the value of Popt is a function of transmission distance, number of multiplexed channels, and modulation formats.…

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Condizione: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Kadhom Moretadha JawadDr. Kadhom was born in Karbala, Iraq in 1982 and received the PhD degree in Modern Communication Engineering in 2013 from Alnahrain University, Baghdad, Iraq. He is currently a staff member in the Electrical . …