Cookies Policy
The website need some cookies and similar means to function. If you permit us, we will use those means to collect data on your visits for aggregated statistics to improve our service. Find out More
Accept Reject
  • Menu
Publications

Publications by Henrique Salgado

2003

Tunable L-band erbium-doped fibre ring laser by means of induced cavity loss using a fibre taper

Authors
Melo, M; Frazao, O; Teixeira, ALJ; Gomes, LA; da Rocha, JRF; Salgado, HM;

Publication
APPLIED PHYSICS B-LASERS AND OPTICS

Abstract
In 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 power is observed over all the tuning range.

2005

Chirped fibre Bragg grating based multiplexer and demultiplexer for DWDM applications

Authors
Romero, R; Frazao, O; Floreani, F; Zhang, L; Marques, PVS; Salgado, HM;

Publication
OPTICS AND LASERS IN ENGINEERING

Abstract
A multiplexer/demultiplexer for 100GHz channel spacing based on chirped fibre Bragg gratings with different bandwidths and optical circulators is presented. The spectral characteristics, specifications and operation of these passive devices are described, showing its potential use in dense wavelength division multiplexing (DWDM) applications.

2005

Optical fiber communications: Recent contributions in photonic device technology

Authors
Carvalho, JP; Romero, R; Melo, M; Gomes, LA; Frazao, O; Marques, MB; Salgado, HM;

Publication
FIBER AND INTEGRATED OPTICS

Abstract
The current status of the research and development as well as the recent contributions in optical communications at INESC Porto is reviewed. This review includes all the work carried out in the last few years in optical fiber communications, namely the development of passive and active optical devices. Some of the passive structures that have been studied and developed are: add-drop multiplexers, multiplexer/ demultiplexer based on Bragg grating technology, dispersion compensators, and optical cross-connects. Active photonic devices such as wavelength converters, fiber lasers, and fiber amplifiers have also been studied. New ideas are being continuously developed and tested.

2002

Sampled fibre Bragg grating sensors for simultaneous strain and temperature measurement

Authors
Frazao, O; Romero, R; Rego, G; Marques, PVS; Salgado, HM; Santos, JL;

Publication
ELECTRONICS LETTERS

Abstract
A new scheme is presented for simultaneous measurement of strain and temperature using a sampled fibre Bragg grating based on a long period structure written using the electric are technique. The temperature and strain measurement resolutions are estimated to be +/-0.50degreesC/rootHz and +/-3.38 muepsilon/rootHz, respectively.

2005

Arc-induced long-period gratings

Authors
Rego, G; Marques, PVS; Santos, JL; Salgado, HM;

Publication
FIBER AND INTEGRATED OPTICS

Abstract
The electric arc technique allows the inscription of long-period gratings (LPGs) virtually in all types of fibers, including non-photosensitive fibers, the case of non-Ge doped photonic crystal fibers being of particular interest. LPGs written in standard fibers using this technique have shown a high thermal stability. Also, the resistance to. - radiation of LPGs arc-induced in pure-silica-core fibers is being assessed and the achieved results are very promising. We have also demonstrated that the combination of arc-induced LPGs and UV-induced fiber Bragg gratings (FBGs) leads to sampled FBGs that are able to address sensing functionalities with enhanced performance. Therefore, as a result of their properties, gratings induced by arc-discharges can find a wide range of applications in optical communications as well as in fiber sensing.

2005

Simultaneous measurement of temperature and strain based on arc-induced long-period fibre gratings

Authors
Rego, G; Marques, PVS; Salgado, HM; Santos, JL;

Publication
ELECTRONICS LETTERS

Abstract
A study on arc-induced long-period fibre gratings (LPFGs) revealed that their strain sensitivity depends on the electric current of the arc discharge. Based on that property, a sensor scheme comprising two concatenated LPFGs was implemented for discrimination of temperature and strain effects. This sensor presented resolutions of +/-0.1 degreesC/rootHz and +/-35 muepsilon/rootHz, respectively.

  • 14
  • 25