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Realização em tecnologia monolítica de Arsenieto de Gálio (GaAs MMIC) de amplif...
António L.J. Teixeira; Mário J. N. Lima; J. Nuno Matos; Paulo Monteiro; J. R. Ferreira da RochaNowadays the clock recovery circuits used for frequencies up to 10 Gbit/s use open-loop structures. The band-pass filters used on these structures are implemented with dielectric resonators (DR). This kind of filters introduce spurious modes that degradate the characteristics of the recovered clock signal. So, the clock amplification stage is required not only to provide the desired clock signal levels, but als...
Redes de Bragg para filtragem em sistemas WDM
Mário J. N. Lima; António L. J. Teixeira; J. R. Ferreira da RochaIn this contribution it is demonstrated the efficiency of apodized Bragg gratings, with negative variation of the refractive index, as optical filters in wavelength division multiplexing (WDM) systems, acting simultaneously as demultiplexers and dispersion compensators. Using a negative apodized Bragg grating, with a Gaussian profile, it is possible to demultiplex a 160 Gbit/s ...
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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