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In this paper, the ultimate limit of the signal to nonlinear noise ratio (SNRNLI) for high bit rate system operating near zero-dispersion wavelength is calculated. Carried out simulations revealed that the shape coefficient (Φ) is a very important factor that must be taken into account in the theoretical model.
The new type of narrowband bandpass filter is presented. The design and realization of the filter in microstrip technology is described. The filter has been etched from YBCO thin film deposited on sapphire substrate. The filter has bandwidth of 0.2 %, RL better than 20 dB and a size of 2 inch in diameter. The structure consists of coupled half-wavelength resonators with additional cross couplings...
We concentrated on the development of our own software for simulating semiconductor lasers and laser amplifiers, interactive simulation of optical communication systems, numerical analysis of transient effects in Raman fibre amplifiers and improving the efficiency and accuracy of splitstep Fourier analysis suitable for solution of non-linear Schrödinger equation.
Scilab toolbox for fiber optic communication systems simulation was developed, named SSS. The features of SSS simulator are presented by including examples of program code with short comments explaining the key instructions, followed by graphical presentation of simulation results. Scilab is an open-source alternative of Matlab and combined with SSS toolbox could be implemented in research and education.
We introduce a mixed-integer optimization model for two-layer IP-over-Flexgrid networks, and present a cost study performed using the CPLEX package for the introduced model. The study concerns a generic German network with 12 nodes and 20 links in the optical layer, and a set of six IP traffic matrices with increasing demand volumes. The optimization assumes a hot-standby mechanism in the optical...
Closed-form analytical expressions for nonlinear noise power FWM density (IFWM) have been derived for Nyquist WDM systems as a function of the optical fiber and system parameters (i.e. dispersion, nonlinearity, power spectral density, and spectral efficiency) in case of near-zero fiber attenuation.
Closed-form analytical expressions for nonlinear noise power FWM density Ifwm have been derived for WDM systems as a function of the optical fiber and system properties (i.e. fiber attenuation, dispersion, nonlinearity, power spectral density, and spectral efficiency).
The idea, design and realization of HTS bandpass filters for ISM band is presented. The YBCO deposited on sapphire substrate has been used. The filter consists of stepped impedance planar resonators forming a lattice structure. Such a structure is suitable for filters with small size and narrow to intermediate bandwidths. The filters have been designed by combined optimization in Microwave Office...
Optical network architectures with elastic bandwidth provisioning are a very promising approach for next generation optical networks. Such elastic optical networks will enable efficient resource utilization and flexible sub-wavelength and super-channel connection provisioning to support heterogeneous and immense bandwidth demands. In this paper, we focus on the problem of Routing, Modulation Level,...
In this paper we address the problem of the impairments in Radio-over-Fiber (RoF) transmission which occur in an optical link in a millimeter-wave (mm-wave) band, e.g. for 60 GHz carrier frequency. We carry out some basic relations between DSB, SSB and OSC modulation formats and than compare duobinary and RZ modulation by numerical simulations.
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