Analytical models for evaluation of optical amplifiers, namely EDFA, on communications systerns are developed. Particular aspects like opical gain, ASE noise and saturated operation are given special attention. Development of a new moment generation function for the electrical decision current is reported.The model is now abLe to deal with the main stochastic processes ocurring on ...
This 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...
This 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...
This 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...
With 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...
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