1996
Autores
Ribeiro, ABL; Ferreira, LA; Tsvetkov, M; Santos, JL;
Publicação
ELECTRONICS LETTERS
Abstract
A passive self-referencing all-fibre technique for Bragg wavelength detection using a biconical fibre filter is described. This filter, basically a tapered depressed-cladding fibre, exhibits a periodic spectral power dependence which permits direct tracking of wavelength shifts in a 20nm unambiguous range. Dynamic strain resolution of 1.5 mu strain/root Hz has been achieved.
1995
Autores
RIBEIRO, ABL; CALEYA, RF; SANTOS, JL;
Publicação
APPLIED OPTICS
Abstract
Progressive ladder topology is studied by consideration of its properties of power budget and coupler tailoring. Optimization criteria are addressed for lossless and real systems, and their basic characteristics are compared with other topologies. Numerical results are presented, and an experiment is described for the case in which the network supports interferometric and intensity (with referentiation) fiber-optic-based sensors.
2002
Autores
Abe, I; Schiller, MW; Nogueira, RN; Lopes, P; Frazao, O; Santos, JL; Pinto, JL; Kalinowski, HJ;
Publicação
2002 IEEE/LEOS ANNUAL MEETING CONFERENCE PROCEEDINGS, VOLS 1 AND 2
Abstract
A simulation characterization with FEM was made, showing that the HiBi fibre was sensitive to different applied load angles. As such, the experimental data for transversal strain was assessed and the obtained sensibility values were in accordance with the simulation results. The collected data enable the complete characterization of the HiBi FBG, showing its capability to be used as a multiparameter sensor.
2003
Autores
Romero, R; Salgado, HM; Frazão, O; Marques, PVS; Santos, JL;
Publicação
Optics InfoBase Conference Papers
Abstract
A chirped fibre Bragg grating was written in an Erbium doped fibre. It was found that the slope of the reflected spectral power could be tuned by changing the pump power. The gratings fabricated were demonstrated to be useful in the development of a technique for optical interrogation of FBGs sensing heads with tunable sensitivity. © 2003 OSA/BGPP.
2005
Autores
Rego G.M.; Fernandez A.F.; Santos J.L.; Salgado H.M.; Berghmans F.; Gusarov A.;
Publicação
Recent Advances in Multidisciplinary Applied Physics
Abstract
2005
Autores
Rego G.; Santos J.; Salgado H.;
Publicação
Recent Advances in Multidisciplinary Applied Physics
Abstract
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