Encontrados 7 documentos, a visualizar página 1 de 1
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...
Remote Optical Monitor of Blood Oxygenation
D. R. Santos; R. J. O. Andrade; A L. J. Teixeira; C. A. C. Bastos; P. S. AndréPulse oximetry is a widely used technique in biomedical analyses. It enables monitoring the percentage of saturated hemoglobin and heart pulse in a noninvasive way.The mandatory permanence of patients in medical facilitiesdue to continuous measurements of blood oxygen saturationand cardiac pulse can be avoided by taking advantage of nowadays telecommunications technologies. This paperdescribes a pulse oximeter ...
Optimização eficiente do ganho espectral de amplificadores de Raman com bombage...
B. Neto; S. Stevan Jr.; R. Nogueira; A. L. J. Teixeira; M. J. N. Lima; P. S. AndréWe report the use of the Genetic Algorithm (GA) in the optimization of a distributed Raman amplifier spectralgain. The used methodology is based on the direct integrationof Raman propagation equations making use of the transfermatrix method, which ensue into a considerable reduction ofthe computation time. Pointing out an on/off Raman gain of10 dB, we develop a technique based in a combination of theGA with the...
Optimization of optical filter bandwidth for the FSK demodulator in combined IM...
Rui Teixeira; António J. Teixeira; P. S. AndréWe report the study and optimization of orthogonal IM/FSK modulation format systems. These combined modulation formats have been proposed recently to optical labeling of high speed IP packets through DWDM networks. Numerical simulation was used to optimize the optical filter bandwidth of FSK demodulator and to obtain the variation of FSK performance with different FSK and IM b...
Performance Degradations due to Crosstalk in Multiwavelength Optical Networks U...
P. S. André; J. L. Pinto; A. Nolasco Pinto; T. AlmeidaThe impact of homodyne and heterodyne crosstalk on an optical signal passing through an optical add drop multiplexer (OADM) node in dense wavelength division multiplexing (DWDM) network is studied, and the analytical expressions for the power penalty are obtain. The statistical impact of crosstalk on signal is studied by simulation and the results compared with experimental data. ;...
Birrefringência e Dispersão Devido aos Modos de Polarização em Fibras Ópticas
P. S. André; J. L. PintoWe study the birefringence in monomodo optical fibres. The propagation degradation mechanism due to the birefringence are analysed. Several models and characterisation techniques used to describe the phenomena and to measure the differential group delay are presented.We used an hybrid technique to measure the differential group delay due to polarisation mode. ; Este trabalho apresenta ...
Análise, Caracterização e Simulação do Processo de Dispersão Inelástica Estimul...
P. S. André; J. L. PintoWe report the investigation of stimulated Brillouin scattering in monomode optical fibres. The physical origins of the process and the analytically models used to describe it are presented. The stimulated Brillouin scattering process in an optical fibre is experimentally characterised and the results compared with simulation ones. ; Neste trabalho é estudado o processo de d...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||