C. J. A. Bastos-Filho

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In all-optical networks signals are transmitted through physical layer with no regeneration. Therefore, physical impairments along lightpath can severely reduce network performance. For this reason, many efforts have been made to develop impairment aware routing and wavelength assignment algorithms (IRWA) in order to mitigate the impairments effects,(More)
A fundamental issue in Elastic Optical Networks (EONs) relies on choosing a proper route and necessary number of contiguous frequency slots from end-to-end to accommodate the traffic demands. Spectrum assignment based on the traditional First-Fit assignment has been extensively employed in EON investigations due to its inherent simplicity and favorable(More)
In this paper we propose a methodology based on an evolutionary multi-objective optimization algorithm, called NSGA-II to design the topology and define the devices for both all-optical and translucent optical network. We aim to define the topology layout and the specification of the optical devices that should be deployed in the network in order to(More)
We investigate the impact of different physical impairments in the performance of all-optical networks. The physical impairments considered are the gain saturation and amplified spontaneous emission noise depletion in amplifiers, homodyne crosstalk in optical switches, four wave mixing and polarization mode dispersion in the transmission fibers. Our(More)
We present experimental results of distributed gain measurements from a dual-pumped (1050 nm +1550 nm) thulium-doped fiber amplifier using optical frequency-domain reflectometry. We show that significant reductions in total pump power and/or fiber length are realized with the addition of a few milliwatts at 1550 nm. For our experimental conditions, the(More)
We demonstrate the influence of pump direction in the all-optical gain-clamped erbium doped fiber amplifier configuration using optical circulators in the feedback loop. The circulator disposition imposes the clamping laser to counterpropagate with the probe signal. We showed a better performance when the pump laser copropagates with the probe signal for(More)
We propose an adaptive-alternative routing algorithm for all-optical networks, named NrPSR. The algorithm finds the Nrroutes with minor cost for a given source-destination pair according to a cost function expanded in a power series (PSR) in which the coefficients are determined by a Particle Swarm Optimizer. The selected route to attend to the call request(More)
We report on the characterization of a recently introduced dual-wavelength pumping scheme for thulium-doped fiber amplifiers using 800 and 1050 nm. Using a counterpropagating pump configuration, 180 mW of total pump power yielded 27-dB small-signal gain and less than 5-dB noise figure. Furthermore, using optical frequency domain reflectometry, the(More)
We demonstrate the impact of optical switch, amplifier and MUX/DEMUX characteristics on optical network performance evaluated from our physical-impairment-based RWA algorithm. We present blocking probabilities as a function of traffic load and network device parameters.
Fish School Search (FSS) is swarm-based optimizer that excels on multimodal search problems, but presents some drawbacks, such as the necessity to proper define the step used in some operators and the need to evaluate the fitness function twice per fish per iteration. This paper presents a simpler and enhanced version of the FSS, that features three(More)