Publications

Publications by Orlando Frazão

2004

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
Proceedings of the IASTED International Conference Communication Systems and Networks

Abstract
A multiplexer/demultiplexer for 100 GHz 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 DWDM applications.

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2002

Widely tunable L-band erbium doped fiber ring laser by means of induced cavity loss control

Authors
Melo, M; Teixeira, A; Frazao, O; Gomes, L; Lima, M; Santos, C; Pereira, D; Rocha, F; Salgado, HM;

Publication
2002 IEEE/LEOS ANNUAL MEETING CONFERENCE PROCEEDINGS, VOLS 1 AND 2

Abstract
We present and demonstrate a 20 nm tunable L-band fiber ring laser. Tunability is achieved by curving a simple taper which controls the intra-cavity loss.

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2001

EDFA gain flattening using long-period fibre gratings based on the electric arc technique

Authors
Frazao, O; Rego, G; Lima, M; Teixeira, A; Araujo, FM; Andre, P; da Rocha, JF; Salgado, HM;

Publication
LONDON COMMUNICATIONS SYMPOSIUM 2001, PROCEEDINGS

Abstract
We have flattened the gain spectrum of a commercial Erbium-doped fibre amplifier, obtaining a curve with approximately 3 dB of ripple, from 1524 nm to 1551 nm, using long-period fibre gratings as equalising optical filters. The fabrication principle of the long-period fibre grating is based on the electric arc technique.

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2008

<title>Fibre Fabry-Perot sensor for acoustic detection</title>

Authors
Lima, SEU; Frazão, O; Araújo, FM; Ferreira, LA; Miranda, V; Santos, JL;

Publication
19th International Conference on Optical Fibre Sensors

Abstract

2010

<title>Acoustic source location of partial discharges in transformers</title>

Authors
Lima, SEU; Frazão, O; Farias, RG; Araújo, FM; Ferreira, LA; Miranda, V; Santos, JL;

Publication
Fourth European Workshop on Optical Fibre Sensors

Abstract

2010

<title>Fibre laser sensor based on a phase-shifted chirped grating for acoustic sensing of partial discharges in power transformers</title>

Authors
Lima, SEU; Frazão, O; Farias, RG; Araújo, FM; Ferreira, LA; Miranda, V; Santos, JL;

Publication
Fourth European Workshop on Optical Fibre Sensors

Abstract