Publications

Publications by José Manuel Baptista

2000

Fiber optic intensity sensors based on a michelson head configuration with self-referentiation

Authors
Baptista, JM; Santos, JL; Lage, AS;

Publication
LEOS 2000 - IEEE ANNUAL MEETING CONFERENCE PROCEEDINGS, VOLS. 1 & 2

Abstract
Two self-referenced intensity based optical fiber sensors supported on a Michelson sensing head configuration with and without optical feedback are described. Theoretical and experimental studies that demonstrate both sensors are discussed.

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2000

Investigation of a self-referenced fibre optic intensity sensor supported by a multiple beam Sagnac topology

Authors
Baptista, JM; Santos, JL; Lage, AS;

Publication
14TH INTERNATIONAL CONFERENCE ON OPTICAL FIBER SENSORS

Abstract
A self-referenced fibre optic intensity sensor supported by a multiple beam Sagnac configuration is investigated. Sensor linearity and sensitivity are analysed. Theoretical and experimental results are compared, being considered the sensor design and its optimisation.

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1999

Fiber optic intensity sensors based on Michelson topologies

Authors
Baptista, JM; Santos, JL; Lage, AS;

Publication
1999 SBMO/IEEE MTT-S INTERNATIONAL MICROWAVE AND OPTOELECTRONICS CONFERENCE, PROCEEDINGS, VOLS 1 & 2: WIRELESS AND PHOTONICS BUILDING THE GLOBAL INFOWAYS

Abstract
An investigation is performed on the characteristics of two self-referencing resonant fiber optic intensity sensors supported by a Michelson topology. The sensors are based in transmissive and reflective configurations respectively. Via the definition of the measurement parameter (R parameter) the sensitivity and Linearity of the sensors are analyzed. The problem of sensor design and optimization is considered and the features of the two configurations are addressed.

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2009

Stimulated Raman Scattering and its Applications in Optical Communications and Optical Sensors

Authors
Baptista, JM; Costa, JW; Barbero, AP; Martinez, MA; Salgado, HM; Marques, MB; Rocco Giraldi, MM; Correia, C; Frazao, O;

Publication
The Open Optics Journal

Abstract

2009

Brillouin Effects in Distributed Raman Amplifiers under Saturated Conditions

Authors
Rocco Giraldi, MTMR; Rocha, AM; Neto, B; Correia, C; Segatto, MEV; Pontes, MJ; Barbero, APL; Costa, JCW; Martinez, MAG; Frazao, O; Baptista, JM; Salgado, HM; Marques, MB; Teixeira, ALJ; Andre, PS;

Publication
2009 SBMO/IEEE MTT-S INTERNATIONAL MICROWAVE AND OPTOELECTRONICS CONFERENCE (IMOC 2009)

Abstract
This paper analyzes experimentally the limitations observed in lightwave systems using distributed Raman amplifiers operating under large pump power input conditions. The Brillouin effect is observed as the pump power becomes equal to watt centered in a specific pump wavelength. The presence of Brillouin peaks degrades the system performance. The Raman amplifier is set with singlemode and dispersion compensating fibers and evaluated in a high capacity WDM link at transmission rates up to 40 Gb/s per channel. The dispersion compensation was accomplished by adjusting the length of the dispersion compensating fiber. The system and amplifier characterization were developed in terms of the on-off gain, ripple, optical signal-to-noise ratio, eye diagram and extinction ratio.

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2010

RAYLEIGH ASSISTED BRILLOUIN EFFECTS IN DISTRIBUTED RAMAN AMPLIFIERS UNDER SATURATED CONDITIONS AT 40 Gb/s

Authors
Rocco Giraldi, MTM; Rocha, AM; Neto, B; Correia, C; Segatto, MEV; Pontes, MJ; Barbero, APL; Costa, JCW; Martinez, MAG; Frazao, O; Baptista, JM; Salgado, HM; Marques, MB; Teixeira, ALJ; Andre, PS;

Publication
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS

Abstract
This article analyzes experimentally the limitations observed in lightwave systems using distributed Raman amplifiers operating under large pump power input conditions. The Brillouin effect is observed as the pump power reaches 1 W. The presence of Brillouin peaks degrades the performance of the system. The Raman amplification occurs in single mode and dispersion compensating fibers, being evaluated in a link at transmission rate of 40 Gb/s. (C) 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1331-1335, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25162

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