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Extracção Óptica de Relógio para Redes de Elevado Débito
Orlando Frazão; Pedro Tavares; António F. Cunha; L. Botelho Ribeiro; J. Ferreira da RochaThis article reports a modelling and experimental work on all-optical clock extraction for high bit-rate systems using self-pulsation mechanisms in semiconductor lasers at 1300 nm. External cavity DFB semiconductor lasers have been used, of both bulk and multiple quantum-well (MQW) types. ; Este artigo descreve um trabalho de modelização e realização pr...
Automatização de Laboratórios de Medida de Componentes Ópticos e Electrónicos a...
P. J. Silva; P. Mendes; J. Ferreira da Rocha; J. C. Pedro; P. Tavares; P. S. André; N. B. CarvalhoThis paper describes the work developed in the final project of the degree in Electronics and Telecommunications Engineering, at Aveiro University in the domain of laboratory automation. Here are shown some final applications developed with the programming tool of National InstrumentsTM – LabVIEW, such as Pin/Pout, I/V and I/P for device characterisation. ; Nesta comunica&cc...
Auto-pulsação em Lasers de Semicondutor por Bloqueio de Modos e por Injecção
Pedro Tavares; J. Ferreira da Rocha; L. Botelho Ribeiro; Orlando Frazão; António F. CunhaThis article describes two techniques for operating a semiconductor laser in a pulsed regime, namely the mode locking and injection locking mechanisms. For each one we present the operational principle, the theory and simulation results. We also describe the self Q-switching mechanism in multi-sections DFB lasers. ; Este artigo descreve duas técnicas de operar um laser de s...
Auto-pulsação em Lasers de Semicondutor por Comutação do Ganho e do Factor de Q...
Pedro Tavares; J. Ferreira da Rocha; L. Botelho RibeiroThis article describes two techniques for operating a semiconductor laser in a pulsed regime, namely the gain switching and Q-switching mechanisms. For each one we present the operational principle, the theory and simulation results. ; Este artigo descreve duas técnicas de operar um laser de semicondutor em regime pulsado, nomeadamente o mecanismo de comutação...
Técnicas de Extracção Óptica de Relógio
Pedro Tavares; J. Ferreira da Rocha; L. Botelho RibeiroWith the increasing traffic and consequent demand for higher bitrates, optical telecommunications networks include new systems operating exclusively in the optical domain, thus avoiding the optical to electrical conversion. Modules implementing the procedure of alloptical clock recovery are of extreme importance because the produced signal has all the synchronisation information&nb...
Transmissão de Sinais Ópticos em Banda Lateral Única, com Igualação no Domínio ...
Edgardo Costa; António Pinho; Paulo Monteiro; Rui Ribeiro; J. Ferreira da Rocha; Tiago MaiaIn this article is investigated an optical single sideband transmission system at 10 Gbit/s with electrical equalization, using the zero forcing criteria, to compensate the chromatic dispersion. The optical transmission of single sideband signals increases the transmission distances relative to the transmission in double sideband (DSB) form.Simulation results also showed that using this...
Aplicações de Amplificadores de Fibra Dopada de Érbio na banda L
Davide B. M. Pereira; Carlos S. Santos; António L. J. Teixeira; J. Ferreira da Rocha; Mário J. N. Lima; Paulo S. B. AndréIn this paper we describe the principles and some of the aplications of the erbium amplifier for operation in a band extensible to the conventional.We will investigate the advantages of using optical amplifiers with large bandwidth on the actual comunications systems. Also, we will study and implement a recent technique for equalization of the gain by means C-band pumping. Based on...
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