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About

About

Susana. O. Silva received the Licenciatura degree in applied physics (optics and electronics) and the M.Sc. degree in optoelectronics and lasers from the University of Porto, Porto, Portugal, in 2004 and 2007, respectively. She received the Ph.D. degree in Physics at the University of Porto, Porto, Portugal. She is currently with INESC TEC in the Center for Applied Photonics as Pos-Doc researcher. In 2014 S. Silva received the prize for best PhD Theses in Optics and Photonics of 2013. In the last few years, S. Silva has published more than 4 papers in international journals and over 5 papers in national and international conferences. Her fiel of expertise is fabrication of optical fiber sensors for monitoring of physical parameters and development of interrogation systems based on optical fiber rings for monitoring sensors.

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Publications

2018

Analysis of amplification in a fiber ring resonator with a fabry-perot cavity

Authors
Magalhaes, R; Silva, S; Frazao, O;

Publication
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS

Abstract
The placement of an Erbium-doped Fiber Amplifier and a Fabry-Perot cavity inside a fiber ring resonator can generate a sinusoidal modulation in the optical signal obtained. The characterization of this behavior is achieved by changing the length of the Fabry-Perot cavity, which acts as a sensing device. A theoretical model of the optical signal modulation obtained with such configuration is also presented.

2017

Multimode interference-based fiber sensor in a cavity ring-down system for refractive index measurement

Authors
Silva, S; Frazao, O;

Publication
OPTICS AND LASER TECHNOLOGY

Abstract
This work reports a multimode interference-based fiber sensor in a cavity ring-down system (CRD) for sensing temperature-induced refractive index (RI) changes of water. The sensing head is based in multimodal interference (MMI) and it is placed inside the fiber loop cavity of the CRD system. A modulated laser source was used to send pulses down into the fiber loop cavity and an erbium-doped fiber amplifier (EDFA) was placed in the fiber ring to provide an observable signal with a reasonable decay time. The behavior of the sensing head to temperature was studied due to its intrinsic sensitivity to said parameter - a sensitivity of -1.6x10(-9) mu s/degrees C was attained. This allowed eliminating the temperature component from RI measurement of water and a linear sensitivity of 580 mu s/RIU in the RI range of 1.324-1.331 was obtained. The use of a MMI fiber sensor in the proposed CRD configuration allowed achieving a sensitivity similar to 4-fold than that obtained with a tilted fiber Bragg grating and similar to 2-fold than that when a micrometric channel inscribed in the fiber was used.

2017

Embedded Fabry-Perot based Sensor Using Three-Dimensional Printing Technology

Authors
Monteiro, CS; Santos, BF; Silva, SO; Abreu, P; Restivo, MT; Frazao, O;

Publication
2017 25TH INTERNATIONAL CONFERENCE ON OPTICAL FIBER SENSORS (OFS)

Abstract
A sensor based on Fabry-Perot interferometry with a hollow microsphere cavity embedded in a 3D printed structure is proposed. The sensor was tested for lateral loading and temperature, showing promising results. By imprintring the sensor on the structure, the dynamic range of application is severely increased enabling the application of the sensor in harsh environments.

2017

Strain sensor based on hollow microsphere Fabry-Perot cavity

Authors
Monteiro, CS; Silva, SO; Frazao, O;

Publication
THIRD INTERNATIONAL CONFERENCE ON APPLICATIONS OF OPTICS AND PHOTONICS

Abstract
Fusion splicing technique was explored for the fabrication of two sensing structures based on hollow microsphere Fabry-Perot cavity. The first sensor proposed was fabricated with a hollow microsphere tip, working as a probe sensor. This structure was studied for lateral load pressure, yielding a 1.56 +/- 0.01 nm/N sensitivity. The second sensing structure relied on an in-line hollow microsphere, which allowed the detection of lateral load, with a sensitivity of 2.62 +/- 0.02 nm/N. Furthermore, the proposed structure enabled strain sensing, with a sensitivity of 4.66 +/- 0.03 pm/mu epsilon. The two sensing structures were subjected to temperature, presenting low thermal cross-sensitivity.

2017

Analysis of Signal Saturation in a Fiber Ring Resonator integrating an Intensity Sensor

Authors
Magalhaes, R; Silva, SO; Frazao, O;

Publication
2017 25TH INTERNATIONAL CONFERENCE ON OPTICAL FIBER SENSORS (OFS)

Abstract
The proposed technique consists in an optical fiber resonator interrogated for sensor characterization, implementing an alternative technique for dynamic range improvement. Such technique relies on the analysis of an added-signal caused by signal saturation, which occurs due to the broadening of the laser pulse. A wide study for different pulse widths is presented in this work, namely for 100 ns, 5 mu s and 20 mu s, being the last one related to the emergence of an added-signal for the proposed configuration. The behavior of the waveform in the presence of an intensity sensor is also characterized.