San Carlos de Bariloche, Argentina
San Carlos de Bariloche, Argentina

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Bulus Rossini L.A.,Instituto Balseiro CNEA UNCuyo | Costanzo Caso P.A.,Instituto Balseiro CNEA UNCuyo | Paulucci E.,CONICET | Duchowicz R.,CONICET | Sicre E.E.,Argentine Business University, Buenos Aires
Optical Fiber Technology | Year: 2014

In this paper a novel technique for obtaining the amplitude and phase of optical pulses with time extents as short as tens of ps is presented. The method which is based on the transport-of-intensity equation only requires, for a practical realization, of passive fiber optic devices. It employs as the main component a dispersive element with a known second order dispersion coefficient. Two different setup implementations are considered, for which simulations are carried out in order to test the method performance taking into account both, realizable models of the involved devices and typical pulses found in optical transmission systems. The characterization of optical pulses affected by dispersion and nonlinear effects, such as self-phase modulation, is used to evaluate the performance of the method and show the practical feasibility of the future implementation. © 2014 Elsevier Inc. All rights reserved.


Cantargi F.,Bariloche Atomic Center | Cantargi F.,Instituto Balseiro CNEA UnCuyo | Granada J.R.,Bariloche Atomic Center | Granada J.R.,Instituto Balseiro CNEA UnCuyo | Granada J.R.,CONICET
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2010

Solid phases of aromatic hydrocarbons, such as benzene, toluene, mesitylene and a 3:2 mixture by volume of mesitylene and toluene, were studied as potential moderator materials for a cold neutron source. Existing information on the (lattice) translational and rotational modes of the different molecular species was used to produce generalized frequency spectra; the latter included the internal vibrational modes which in turn involved the analysis of the weights of the different modes. Cross-section libraries were generated in ENDF and ACE formats for hydrogen bounded in those materials at several temperatures, and were used in Monte Carlo calculations to analyze their neutron production compared with standard cryogenic materials like liquid hydrogen and solid methane, the best moderators in terms of cold neutron production. In particular, cross-section libraries were generated at 20 K, which is a typical operating temperature for the majority of the existing cold neutron sources. It was found that those aromatic hydrocarbons produce neutron spectra which are slightly warmer than that of solid methane while presenting a high resistance to radiation, conforming in this way a new and advantageous alternative to traditional moderator materials. © 2010 Elsevier B.V. All rights reserved.


Natoli A.,Instituto Balseiro CNEA UNCuyo | Bulus Rossini L.A.,Instituto Balseiro CNEA UNCuyo | Costanzo Caso P.A.,Instituto Balseiro CNEA UNCuyo
2014 IEEE Biennial Congress of Argentina, ARGENCON 2014 | Year: 2014

This paper presents a study of a method called Digital Backward Propagation (DBP) to compensate, simultaneously, the linear and nonlinear effects that occur in a communication link of 10 Gb/s over 500 km of optical fiber (FO), with 8 wavelength division multiplexed (WDM) channels. The procedure used consists in applying the Split Step Fourier Method (SSFM) to solve the inverse Nonlinear Schrödinger Equation (NLSE) by using digital signal processing (DSP) techniques with no inline compensation. The modulation format used for transmission is 4-QAM (Quadrature Amplitude Modulation). The DBP compensation system is compared with a system without compensation and with a link in which only the chromatic dispersion is compensated by dispersion compensated fibers (DCF). © 2014 IEEE.


Segui S.,Bariloche Atomic Center | Segui S.,Instituto Balseiro CNEA UNCuyo | Gervasoni J.L.,Bariloche Atomic Center | Gervasoni J.L.,Instituto Balseiro CNEA UNCuyo | And 3 more authors.
Journal of Physics: Conference Series | Year: 2015

In this work we analyze the fluctuations of the electronic density Δρ and the average number of the excited plasmons, for the case of the diatomic charged molecule traveling near or passing through a metallic nanocylinder at different positions, and compare the results with the case of a single particle. © Published under licence by IOP Publishing Ltd.


Rabal S.,CONICET | Bulus Rossini L.A.,Instituto Balseiro CNEA UNCuyo | Costanzo Caso P.A.,Instituto Balseiro CNEA UNCuyo
2014 IEEE Biennial Congress of Argentina, ARGENCON 2014 | Year: 2014

This paper presents a method to control the delays generated by a cascade of optical ring resonators (ORRs). Delays generated were implemented numerically using 5 ORRs of 12 mm diameter, embedded in silicon dioxide (SiO2) and silicon nitride (Si3N4), and their values were approximately constant in a bandwidth near to 3 GHz. The control parameters of the system are given by the coupling factor and the phase shift of each ORR. © 2014 IEEE.


Cantargi F.,Bariloche Atomic Center | Granada J.R.,Instituto Balseiro CNEA UnCuyo | Mayer R.E.,Instituto Balseiro CNEA UnCuyo
Annals of Nuclear Energy | Year: 2015

Sapphire and silicon are materials usually employed as filters in facilities with thermal neutron beams. Due to the lack of the corresponding thermal cross section libraries for those materials, necessary in calculations performed in order to optimize beams for specific applications, here we present the generation of new thermal neutron scattering kernels for those materials. The Debye model was used in both cases to represent the vibrational frequency spectra required to feed the NJOY nuclear data processing system in order to produce the corresponding libraries in ENDF and ACE format. These libraries were validated with available experimental data, some from the literature and others obtained at the pulsed neutron source at Centro Atómico Bariloche. © 2015 Elsevier Ltd. All rights reserved.


Natoli A.,Instituto Balseiro CNEA UNCuyo | Rossini L.A.B.,Instituto Balseiro CNEA UNCuyo | Caso P.A.C.,Instituto Balseiro CNEA UNCuyo
2015 16th Workshop on Information Processing and Control, RPIC 2015 | Year: 2015

A method to compensate linear and nonlinear effects in a high capacity fiber-optic (FO) communication systems, called Distance Folded Digital Backward Propagation (DF or DF-DBP), is implemented. It is a variant of the Digital Backward Propagation method (DBP) and it has the advantage of reducing the computational cost with respect to DBP. The DF consists in applying the Split Step Fourier Method (SSFM) to solve the nonlinear Schrödinger equation (NLSE) conversely, but using fewer steps than in the DBP. It is evaluated a DF implementation for an 8-channel division multiplexed wavelength (WDM) system, with a transmission rate of 128 Gb/s per channel, a 16-QAM modulation format, and a link of 1200 km length. The system performance is compared in three cases: when electronic compensation is used by DF and by DBP, and when optical dispersion compensation is employed through DCF fiber. © 2015 IEEE.


Battocchio E.,Instituto Balseiro CNEA UNCuyo | Rossini L.B.,Instituto Balseiro CNEA UNCuyo | Caso P.C.,Instituto Balseiro CNEA UNCuyo
2015 16th Workshop on Information Processing and Control, RPIC 2015 | Year: 2015

In this paper we introduce an estimation model of the non-linear effects which affect the signal propagating through optical fiber communication systems with wavelength division multiplexing (WDM). The emergence of non-linear effects with the increase of the transmitted power represents a fundamental limit in current high capacity communication systems. Previously proposed models based in perturbation theory such as the Gaussian Noise model (GN) consider the non-linear interference as additive Gaussian noise. We compare the model estimation results with those obtained through simulation of the optical fiber system by means of extensively verified algorithms based on the integration of the Non-Linear Schroedinger Equation (NLSE) and the Manakov Equation (ME). © 2015 IEEE.


Fernandez M.P.,Instituto Balseiro CNEA UNCuyo | Caso P.A.C.,Instituto Balseiro CNEA UNCuyo | Rossini L.A.B.,Instituto Balseiro CNEA UNCuyo
2015 16th Workshop on Information Processing and Control, RPIC 2015 | Year: 2015

Optical coding has numerous properties that make its application to remote monitoring and failure detection in passive optical networks very attractive. Several approaches for encoder implementation have been proposed. One of them consist of a couple of fiber Bragg gratings forming a cavity producing multi-level periodic codes. In this work we propose and evaluate the performance of two new encoder schemes based on this premise. These new encoders generate codes with Hamming weight 2 and 3 in order to improve the performance of multi-level periodic codes. We observe that the proposed coding schemes show a better performance under certain scenarios. © 2015 IEEE.


Morbidel L.,Instituto Balseiro CNEA UNCuyo | Morbidel L.,CONICET | Bulus Rossini L.A.,Instituto Balseiro CNEA UNCuyo | Costanzo Caso P.A.,Instituto Balseiro CNEA UNCuyo
2014 IEEE Biennial Congress of Argentina, ARGENCON 2014 | Year: 2014

This paper describes the design and analysis of an impedance matching network for spiral logarithmic (self-complementary) broadband antennas, able to operate in a frequency band of 1 GHz to 9 GHz. The proposed design is based on tapered microstrip lines which exhibit a progressive variation of its width by obtaining a gradual change in the impedance. Employing similar concepts over the ground plane, the transformation of a balanced to unbalanced system is achieved (Microstrip to Parallel Striplines Balun), which is necessary to connect the antenna to its feed. This design was optimized for low return loss and unity power transfer. The design was validated by simulation, yielding a return loss greater than 10 dB and an impedance matching between 50 ö and 188 ö, throughout the frequency range of interest. © 2014 IEEE.

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