Encontrados 8 documentos, a visualizar página 1 de 1
Distribution of 3G signals over fiber
Daniel L. Beato; António J. V. Amador; N. Martins; R. Nogueira; A. Teixeira; P. André; M. LimaIn this work we study the feasibility of UMTS (3G) transmission over Passive Optical Networks (P.O.N.). In order to achieve such objective, it was developed a simulator, so that we could correctly model the system and conclude about its impairments. The simulation results obtained validate this kind of transmission and highlight the associated limitations. ; Neste trabalho é estudada a viabilidade da tr...
Caracterização da dispersão numa rede óptica em operação
M. Matos; A. Teixeira; P. AndréIn this work the dispersion characteristics of random spans in a installed private fiber-optic network are discussed, and some field testing measurements techniques are evaluated. ; Neste trabalho discute-se a caracterização da dispersão numa rede óptica em operação e avalia-se a técnica de campo mais usada na medição da dispersão (desvio de...
All-optical routing with MZI-SOAs Switches
T. Silveira; L. Oliveira; P. Teixeira; P. André; R. Nogueira; M. Lima; P. Monteiro; A. TeixeiraA router implementation based on OCDMA header recognition and MZI-SOA switching, allowing ps range packet switching capabilities is presented in this paper. Architecture results are presented. ; A router implementation based on OCDMA header recognition and MZI-SOA switching, allowing ps range packet switching capabilities is presented in this paper. Architecture results are presented.
Characterization of an Amplifier the Waveguide Erbium Doped
S. L. Stevan Jr.; F. Couto; P. André; P. Monteiro; A. L. J. Teixeira; Neste trabalho reportamos a caracterização e testede um amplificador de guia de onda dopado com Erbio(EDWA). As curvas de ganho e figura de ruído em função dapotência de entrada e em função do comprimento de ondaforam obtidas par um método por nós desenvolvido. Ascaracterísticas de largura de banda de ganho saturado efigura de ru&ia...
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...
Evaluating a bioremediation tool for atrazine contaminated soils in open soil m...
Lima, D.; Viana, P.; André, S.; Chelinho, S.; Costa, C.; Ribeiro, R.; Sousa, J. P.; Fialho, A. M.; Viegas, C. A.A previously developed potential cleanup tool for atrazine contaminated soils was evaluated in larger open soil microcosms for optimization under more realistic conditions, using a natural crop soil spiked with an atrazine commercial formulation (Atrazerba FL). The doses used were 20£ or 200£ higher than the recommended dose (RD) for an agricultural application, mimicking over-use or spill situations. Pseudomon...
EDFA Gain Flattening Using Long-Period Fibre Gratings Based on the Electric Arc...
O. Frazão; G. Rego; M. Lima; A. Teixeira; F. M. Araújo; P. André; J. F. da Rocha; Henrique SalgadoWe have flattened the gain spectrum of a commercial Erbium-doped fibre amplifier, obtaining a curve with approximately 3 dB of ripple, from 1524 nm to 1551 nm, using long-period fibre gratings as equalising optical filters. The fabrication principle of the long-period fibre grating is based on the electric arc technique.
Research of the optical communications groups at University of Aveiro and Insti...
da Rocha, J.F.; Tavares, P.; Frazão, O.; Monteiro, P.; Andre, P.S.; Teixeira, A.; Lima, M.; Pinto, A.N.; Gameiro, A.; Ribeiro, R.; Ribeiro, L.This paper summarizes the research activities of the optical communications group at University of Aveiro and Institute of Telecommunications – Aveiro pole. Several activities like clock recovery systems, both electrical and all optical, electrical equalizers for very high bit rate DST systems, post-detection filters for multigigabit optical receivers, soliton systems, simulation work on WDM, DST, EDFA and shor...
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