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Ferramenta de Simulação para Análise Espectral de Redes de Bragg
Rogério P. Dionísio; Mário J. Lima; J. R. Ferreira da Rocha; J. L. Pinto; António J. TeixeiraFiber Bragg gratings are becoming important components for optical communication networks, allowing many operations to be realized without the need of conversion between electrical and optical domain. This paper presents a simulation and design tool for spectral characterization of Bragg gratings, based on Matlab, together with a graphical user interface created fromGUIDE toolbox, ...
Performance Degradations due to Crosstalk in Multiwavelength Optical Networks U...
P. S. André; J. L. Pinto; A. Nolasco Pinto; T. AlmeidaThe impact of homodyne and heterodyne crosstalk on an optical signal passing through an optical add drop multiplexer (OADM) node in dense wavelength division multiplexing (DWDM) network is studied, and the analytical expressions for the power penalty are obtain. The statistical impact of crosstalk on signal is studied by simulation and the results compared with experimental data. ;...
Birrefringência e Dispersão Devido aos Modos de Polarização em Fibras Ópticas
P. S. André; J. L. PintoWe study the birefringence in monomodo optical fibres. The propagation degradation mechanism due to the birefringence are analysed. Several models and characterisation techniques used to describe the phenomena and to measure the differential group delay are presented.We used an hybrid technique to measure the differential group delay due to polarisation mode. ; Este trabalho apresenta ...
Análise, Caracterização e Simulação do Processo de Dispersão Inelástica Estimul...
P. S. André; J. L. PintoWe report the investigation of stimulated Brillouin scattering in monomode optical fibres. The physical origins of the process and the analytically models used to describe it are presented. The stimulated Brillouin scattering process in an optical fibre is experimentally characterised and the results compared with simulation ones. ; Neste trabalho é estudado o processo de d...
Dosimetric Study of Enhanced Dynamic Wedges to Clinical Implementation into XiO...
C. Rodrigues; V. Batel; S. Germano; I. Monteiro Grillo; J.L. PintoThis work presents the physical and dosimetric properties of the Enhanced Dynamic Wedges (EDW) including depth doses, beam profiles and effective wedge attenuatin factors (EWAF) by experimental determinations.The measurements were performed for 6 MV at a Linear accelerator Varian Clinac 2100 C/D, Varian Medical Systems. The main purpose of this work was to study the dosimetric properties of EDW in order to impl...
Bragg Gratings with Enhanced Temperature Sustainability Written in a High- Germ...
M. J. N. Lima; R. N. Nogueira; J. C. C. Silva; A. L. J. Teixeira; P. S. B. André; J. R. F. da Rocha; J. H. Kalinowski; J. L. PintoIn this contribution we report the achievement offiber Bragg gratings exhibiting high temperaturesustainability, resultant from type IIA and a new abnormalexposition regimes, and compare their thermal stability withother gratings obtained from different growth mechanisms,namely type I and IA. It is expected that type IIA and thedesignated as abnormal gratings improve the reliability ofhigh-temperature grating-s...
Dispersion modeling a dynamic chromatic dispersion compensator based on Bragg g...
B. Neto; M. J. N. Lima; A. L. J. Teixeira; R. N. Nogueira; J. L. Pinto; J. R. F. da Rocha; P. AndréWe report a method to realize tunable chromatic dispersion compensation based on chirped fiber Bragg gratings (CFBG). The changes on the CFBG dispersion are achieved by controlling a temperature gradient applied to the grating. A thermodynamic model is presented enabling us to simulate the temperature distribution along the grating lenght. Furthermore, a theoretical approach was de...
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