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Thermally Tunable Bragg Grating Filtrers for Wavelength-Multiplexed Systems
M. J. N. Lima; O. Frazão; A. L. J. Teixeira; P. S. B. André; J. R. Ferreira da RochaIn this contribution we compare the thermal tuning capabilities of two type I gratings, considering an unloaded and a hydrogen-loaded fiber, and a type IIa grating. We further study their responses stability with temperature, analyzing their potential as optical filters in wavelength division multiplexing systems. We conclude that all of them have similar tuning efficiencies, howev...
Tunable L-band erbium-doped fibre ring laser by means of induced cavity loss us...
M. Melo; O. Frazão; A. L. J. Teixeira; L. A. Gomes; J.R. Ferreira da Rocha; H. M. SalgadoIn this paper, we present a continuous-wave tunable fibre ring laser operating in the L-band. A bi-directional pumped L-band erbium-doped fibre amplifier provides gain to the loop. Tunability is achieved by bending a single-mode fibre taper using a micrometer drive, controlling in this way the spectral cavity losses. Laser emission is achieved between 1587 and 1606 nm, and low variation of the output laser powe...
Microangiopathic hemolytic anemia. A form of presentation of stomach neoplasm.
Oliveira, A; Serviço de Medicina I, Hospital de Santa Maria, Lisboa.; Frazão, A; Duarte, P C; Nogueira, BThe authors report the case of a 53-year-old female with symptomatic anemia and hemorrhagic diathesis. The patient presented thrombocytopenia, microangiopathic hemolytic anemia and leukoerythroblastic reaction in peripheral blood film. The diagnosis of metastatic gastric carcinoma was made by subsequent studies. A review is made of the literature concerning microangiopathic hemolytic anemia, namely its etiology...
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