2010
Autores
Pinto, AMR; Frazao, O; Santos, JL; Lopez Amo, M;
Publicação
APPLIED PHYSICS B-LASERS AND OPTICS
Abstract
In this work, a multiwavelength fiber Raman laser based on a highly birefringent photonic crystal fiber loop mirror is presented. A laser resonator is formed when the Raman amplification with cooperative Rayleigh scattering in a dispersion-compensating fiber is used as a distributed mirror and combined with a photonic crystal fiber loop mirror filtering structure. Stable multiwavelength lasing at room temperature is achieved due to the low temperature sensitivity of the highly birefringent photonic crystal fiber.
2000
Autores
Ferreira, LA; Diatzikis, EV; Moreira, PJ; Santos, JL; Farahi, F;
Publicação
OPTICAL FIBER TECHNOLOGY
Abstract
The interrogation of fiber Bragg grating sensors with multimode laser diodes is theoretically and experimentally analyzed using two different approaches: serrodyne and dithering techniques. It is also demonstrated that by using several laser modes it is possible to enhance the measurement range without compromising sensitivity, (C) 2000 Academic Press.
1998
Autores
Moreira, PJ; Ferreira, LA; Santos, JL; Farahi, F;
Publicação
EUROPEAN WORKSHOP ON OPTICAL FIBRE SENSORS
Abstract
1998
Autores
Ferreira, LA; Araujo, FM; Santos, JL; Farahi, F;
Publicação
EUROPEAN WORKSHOP ON OPTICAL FIBRE SENSORS
Abstract
1996
Autores
Baptista, JM; Cavaleiro, PM; Santos, JL;
Publicação
International Journal of Optoelectronics
Abstract
An investigation is performed of the characteristics of the self-referencing intensity based Q-type fibre optic sensor using a recirculation loop structure. Both transmissive and reflective configurations are analysed. Via the definition of the measurement parameter (the R parameter) the linearity and sensitivity of the sensor are addressed. Theoretical and experimental results are compared, considering the problem of sensor design and optimization. © 1995 Taylor & Francis Ltd.
2010
Autores
Aref, SH; Zibaii, MI; Kheiri, M; Porbeyram, H; Latifi, H; Frazao, O; Araujo, FM; Ferreira, LA; Santos, JL; Kobelke, J; Schuster, K;
Publicação
FOURTH EUROPEAN WORKSHOP ON OPTICAL FIBRE SENSORS
Abstract
In this work, two all-fibre interferometric configurations based on suspended core fibres (SCF) are investigated. A Fabry-Perot cavity made of SCF spliced in-between segments of single-mode and hollow-core fiber is proposed. An alternative sensing head configuration formed by the insertion of a length of SCF as a birefringence element in a Sagnac interferometer is also demonstrated. The sensitivity to pressure and temperature was determined for both configurations.
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