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Publicações

Publicações por Henrique Salgado

2009

Brillouin Effects in Distributed Raman Amplifiers under Saturated Conditions

Autores
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;

Publicação
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.

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

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

2011

Developing aircraft photonic networks - An overview of the European DAPHNE project

Autores
Proudley, GM; Brownjohn, N; Baptista, J; Bacou, A; Salgado, HM; Clausen, A; Deimel, P; Farries, M; Gauchy, S; Kopacek, I; Lee, A; Napier, B; Traversone, M; Vincent, J; Zimmermann, A;

Publicação
2011 IEEE Avionics, Fiber- Optics and Photonics Technology Conference, AVFOP 2011

Abstract
DAPHNE (Developing Aircraft PHotonic NEtworks) is a 3-year European FP7 project (started September 2009). The aim of DAPHNE is to exploit terrestrial optical networking technology (with associated performance advantages) in future aircraft and systems. The consortium comprises fifteen partners (from seven nations) ranging from major air framers (both fixed and rotary wing) through component and equipment manufacturers and leading European universities. The project is coordinated by Airbus. © 2011 IEEE.

1986

SPATIAL-FILTERING AND FREQUENCY COLOR CODING WITH PHOTOREFRACTIVE CRYSTALS

Autores
BERNARDO, LM; SALGADO, HM; SOARES, ODD;

Publicação
OPTICA ACTA

Abstract
Image processing can be supported by efficient thick holographic recording media such as photorefractive crystals. A numerical analysis is presented showing how low- and band-pass tunable filtering as well as frequency color coding can be performed with reflection holographic gratings recorded in photorefractive crystals.

2011

Signal Processing Techniques for Transmission Impairments Compensation in Optical Systems

Autores
Oliveira, JMB; Pessoa, LM; Salgado, HM; Darwazeh, I;

Publicação
2010 12TH INTERNATIONAL CONFERENCE ON TRANSPARENT OPTICAL NETWORKS (ICTON)

Abstract
We discuss recent developments in signal processing techniques for post-compensation of fiber dispersion and nonlinear distortion in both coherent and radio-over-fiber optical systems.

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