Publicacoes - INESC TEC

Publicações

Publicações por Orlando Frazão

2010

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

Autores
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;

Publicação
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

FecharLer Abstract

2012

Brillouin effect characterization in all-Raman amplified 4 40 Gb/s WDM system

Autores
Pontes, MJ; Segatto, MEV; Barbero, APL; Rocco Giraldi, MTM; Rocha, AM; Neto, B; Costa, JCW; Martinez, MAG; Frazao, O; Baptista, JM; Salgado, H; Teixeira, ALJ; Andre, PS;

Publicação
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS

Abstract
This article analyzes experimentally the limitations observed in a 45 km Raman amplified 4 x 40 Gb/s transmission system operating under multiple pump and single high pump power configurations. A signal-to-noise ratio of 19.2 dB, an extinction ratio of 10.4 dB and a jitter of 1097 fs are achieved for moderate pump powers and higher order stimulated Brillouin scattering lines give rise to system degradation for pump power levels more than 0.5 W. (C) 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:14031407, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26827

FecharLer Abstract

2004

<title>Intensity-referenced temperature-independent curvature sensing concept based on chirped gratings embedded in a composite laminate</title>

Autores
Romero, R; Frazao, O; Pereira, DA; Salgado, HM; Araujo, FM; Ferreira, LAA;

Publicação
Second European Workshop on Optical Fibre Sensors

Abstract

2002

Apodisation of uniform Fibre Bragg Gratings using electric arc discharges

Autores
Rego, G; Romero, R; Frazao, O; Marques, PVS; Salgado, HM;

Publicação
PROCEEDINGS OF 2002 IEEE/LEOS WORKSHOP ON FIBRE AND OPTICAL PASSIVE COMPONENTS

Abstract
We report the use of the electric arc technique to apodise Fibre Bragg Gratings (FBG). Electric arc discharges applied at the ends of the grating produce a smoothing of the refractive index modulation profile which reduces the side lobes at longer wavelengths. Using this technique, a FBG was apodised with a side lobe reduction of 17 dB.

FecharLer Abstract

2004

<title>Simultaneous measurement of strain and temperature based on polarization loss properties of arc-induced long-period gratings</title>

Autores
Frazao, O; Rego, GM; Araujo, FM; Ferreira, LA; Salgado, HM; Santos, JL;

Publicação
Second European Workshop on Optical Fibre Sensors

Abstract

2005

Low-loss splice in a microstructured fibre using a conventional fusion splicer

Autores
Frazao, O; Carvalho, JP; Salgado, HM;

Publicação
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS

Abstract
A simple splice technique to fuse a SMF-28 (TM) and a microstructured fibre using a conventional electric-are splicer is presented. The technique consists in applying the electric arc in the SMF-28 (TM) region. The fusion-loss dependence with arc duration for constant fusion power is also investigated. A splice loss of 0.25 dB is obtained with high rtproducibility. (c) 2005 Wiley Periodicals, Inc.

FecharLer Abstract