Uiara Moura - Academia.edu (original) (raw)
Papers by Uiara Moura
Latin America Optics and Photonics Conference, 2012
ABSTRACT We experimentally demonstrate the transmission of 80 channels over 2000km of SSMF fiber.... more ABSTRACT We experimentally demonstrate the transmission of 80 channels over 2000km of SSMF fiber. Hybrid optical amplifiers (DRA couter-propagating and EDFA) were used to amplify the 112Gbps DP-QPSK channels leading to 1.14E-5 of BER after 2000km.
Journal of Microwaves, Optoelectronics and Electromagnetic Applications, 2013
In this work we present and analyze three approaches for the adaptive control of the operating po... more In this work we present and analyze three approaches for the adaptive control of the operating point of a cascade of Erbium-doped fiber amplifiers (EDFA), aiming optical networks performance enhancement. The first approach is called Annealing Search Heuristic with Backpropagation and flexible output (AsHB flex) and uses machine learning concepts to update the amplifiers gains through an iterative process. The second one (Exhaustive Method) uses an exhaustive search to evaluate all possible solutions for the problem and obtain the optimum solution. The last one (MaxGain) is a heuristic method that uses previous knowledge about the problem to obtain the solutions. The amplifier characteristics and specifications were obtained experimentally through measurements of gain, noise figure, gain ripple and power consumption on commercially available EDFAs. We performed comparisons among these approaches and others found in the literature, and the results show that the three proposals outperformed the previous ones in terms of noise figure, gain ripple and BER. For example, in a link with 4 amplifiers the Exhaustive Method achieved a reduction of the cascade noise figure from 10.05 dB to 5.18 dB, a reduction of the gain ripple from 24.08 dB to 18.56 dB and a reduction of the BER in almost two orders of magnitude, when compared with the traditional approach, which defines the gain to compensate the loss of the previous link. However, the computation time of Exhaustive Method becomes prohibitive as the number of amplifiers in the link increases. Both Max-Gain and AsHB flex obtained similar solutions, close to the optimum operation point in a reasonable time.
Latin America Optics and Photonics Conference, 2012
We experimentally demonstrate the transmission of 80 channels over 2000km of SSMF fiber. Hybrid o... more We experimentally demonstrate the transmission of 80 channels over 2000km of SSMF fiber. Hybrid optical amplifiers (DRA couter-propagating and EDFA) were used to amplify the 112Gbps DP-QPSK channels leading to 1.14E-5 of BER after 2000km.
2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011), 2011
This paper presents a systemic simulation analysis to find the maximum reach of an optical WDM di... more This paper presents a systemic simulation analysis to find the maximum reach of an optical WDM distributed Raman amplified system evaluated in the following scenario: three different channel loads located at the C-Band, advanced modulation formats for 46 and 112 Gb/s data rates, chromatic dispersion compensation across the span and signal re-amplification carried out through optimized distributed Raman amplifiers (DRAs),
Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2013, 2013
We demonstrate cognitive gain control for EDFA operation in real-time GMPLS controlled heterogene... more We demonstrate cognitive gain control for EDFA operation in real-time GMPLS controlled heterogeneous optical testbed with 10G/100G/200G/400G lightpaths. Cognitive control maintains the network BER below FEC-limit for up to 6 dB of induced attenuation penalty.
Journal of Microwaves, Optoelectronics and Electromagnetic Applications, 2013
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC), 2013
ABSTRACT A hybrid Raman/EDF amplifier topology with a novel hybrid gain control (HGC) scheme base... more ABSTRACT A hybrid Raman/EDF amplifier topology with a novel hybrid gain control (HGC) scheme based on joint actuation to provide flattened spectral gain together with improved noise figure was developed. This paper compares the hybrid amplifier performance with the most used optical amplifier topology to provide flat spectral gain (two-stage EDFA with coupled AGC), showing an improved of equivalent noise figure (1.12-6.53 dB) with flattened spectrum for all dynamic operation range (full C-band load). The hybrid amplifier yet improve the channels output OSNR along 100km SSMF span (1.67-5.04 dB) and reduces the channels OSNR degradation, enabling its use for WDM reconfigurable optical networks with 100 Gb/s advanced modulation formats transceivers.
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC), 2013
In this paper, we analyze the EDFA adaptive gain control impact on 80 modulated C-band channels (... more In this paper, we analyze the EDFA adaptive gain control impact on 80 modulated C-band channels (10 Gbps NRZ) in a DWDM optical system composed of four cascaded amplifiers. System performance was evaluated in terms of channels optical signal-to-noise ratio (OSNR), noise figure (NF), bit error rate (BER), and gain flatness (GF) measurements. The EDFA adaptive gain control scheme aims to optimize NF and GF spectra and was improved here to prioritize one of these parameters when BER of the received signal remains under the FEC limit.
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC), 2013
ABSTRACT This paper presents a method to autonomously adjust the operating point of amplifiers in... more ABSTRACT This paper presents a method to autonomously adjust the operating point of amplifiers in a cascade using an approach based on machine learning. The goal is to smoothly adjust the gain of each amplifier in the cascade in order to reach predefined input and output power levels for the entire link, aiming to minimize both the noise figure and the gain flatness of the transmission system. The proposal uses an iterative method and performs feedforward and backward error adjustments based on local information. The experimental results indicate that our proposal can optimize the performance of the link ensuring predefined input and output power levels, which is important in a network scenario. As an example, our proposal was capable to define the gain of 6 amplifiers returning a link with a noise figure equal to 30.06 dB and a gain flatness equal to 5.26 dB, while maintaing the input and output powers around 3 dBm with an error lower than 0.1 dB.
Journal of Lightwave Technology, 2000
In this work we carry out a comprehensive experimental study on hybrid optical amplification topo... more In this work we carry out a comprehensive experimental study on hybrid optical amplification topologies (based on first order Raman and Erbium doped fiber amplifiers) for repeaterless transmission of 112 Gb/s dual polarizationquadrature phase shift keying (DP-QPSK) enabling a 4.48 Tb/s (40x112Gb/s) transmission over 302 km of standard single mode fiber with coherent detection. Hybrid optical amplification was employed for signal boosting and pre-amplification and repeaterless transmission is assured without the use of neither inline amplification nor remote optical amplifiers. The goal was to achieve the highest bandwidth-distance product for repeaterless DWDM transmission systems over legacy fiber without any inline amplification technology. The achieved result is a significant milestone, when compared to recent state-of-the-art investigations.
Journal of Microwaves, Optoelectronics and Electromagnetic Applications
Resumo—Este artigo apresenta uma metodologia para projeto de amplificadores Raman distribuídos co... more Resumo—Este artigo apresenta uma metodologia para projeto de amplificadores Raman distribuídos com múltiplos lasers de bombeio. O objetivo dessa metodologia é determinar os comprimentos de onda e os níveis de potência dos lasers de bombeio, maximizando ganho com perfil espectral plano. Utilizando as restrições físicas dos componentes ópticos, são avaliadas todas as combinações de bombeio no projeto do amplificador Raman distribuído. Foram projetados amplificadores com 2, 3 e 4 lasers de bombeio, obtendo bons resultados comparados com outros métodos de otimização utilizados na literatura. Os resultados obtidos apresentaram ganho on-off de 27,93 dB com ripple aproximado de 1 dB utilizando 3 lasers de bombeios. Palavras-Chave—amplificadores ópticos, amplificadores distribuídos, otimização, espalhamento Raman, redes WDM . Abstract—This paper presents an optimized design methodology of distributed Raman amplifiers with multiple pump lasers. The goal of this methodology is determine the p...
Journal of Microwaves, Optoelectronics and Electromagnetic Applications, 2014
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC), 2013
ABSTRACT This paper presents a method to autonomously adjust the operating point of amplifiers in... more ABSTRACT This paper presents a method to autonomously adjust the operating point of amplifiers in a cascade using an approach based on machine learning. The goal is to smoothly adjust the gain of each amplifier in the cascade in order to reach predefined input and output power levels for the entire link, aiming to minimize both the noise figure and the gain flatness of the transmission system. The proposal uses an iterative method and performs feedforward and backward error adjustments based on local information. The experimental results indicate that our proposal can optimize the performance of the link ensuring predefined input and output power levels, which is important in a network scenario. As an example, our proposal was capable to define the gain of 6 amplifiers returning a link with a noise figure equal to 30.06 dB and a gain flatness equal to 5.26 dB, while maintaing the input and output powers around 3 dBm with an error lower than 0.1 dB.
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC), 2013
In this paper, we analyze the EDFA adaptive gain control impact on 80 modulated C-band channels (... more In this paper, we analyze the EDFA adaptive gain control impact on 80 modulated C-band channels (10 Gbps NRZ) in a DWDM optical system composed of four cascaded amplifiers. System performance was evaluated in terms of channels optical signal-to-noise ratio (OSNR), noise figure (NF), bit error rate (BER), and gain flatness (GF) measurements. The EDFA adaptive gain control scheme aims to optimize NF and GF spectra and was improved here to prioritize one of these parameters when BER of the received signal remains under the FEC limit.
Journal of Microwaves, Optoelectronics and Electromagnetic Applications, 2013
2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011), 2011
This paper presents a systemic simulation analysis to find the maximum reach of an optical WDM di... more This paper presents a systemic simulation analysis to find the maximum reach of an optical WDM distributed Raman amplified system evaluated in the following scenario: three different channel loads located at the C-Band, advanced modulation formats for 46 and 112 Gb/s data rates, chromatic dispersion compensation across the span and signal re-amplification carried out through optimized distributed Raman amplifiers (DRAs),
Latin America Optics and Photonics Conference, 2012
ABSTRACT We experimentally demonstrate the transmission of 80 channels over 2000km of SSMF fiber.... more ABSTRACT We experimentally demonstrate the transmission of 80 channels over 2000km of SSMF fiber. Hybrid optical amplifiers (DRA couter-propagating and EDFA) were used to amplify the 112Gbps DP-QPSK channels leading to 1.14E-5 of BER after 2000km.
Journal of Microwaves, Optoelectronics and Electromagnetic Applications, 2013
In this work we present and analyze three approaches for the adaptive control of the operating po... more In this work we present and analyze three approaches for the adaptive control of the operating point of a cascade of Erbium-doped fiber amplifiers (EDFA), aiming optical networks performance enhancement. The first approach is called Annealing Search Heuristic with Backpropagation and flexible output (AsHB flex) and uses machine learning concepts to update the amplifiers gains through an iterative process. The second one (Exhaustive Method) uses an exhaustive search to evaluate all possible solutions for the problem and obtain the optimum solution. The last one (MaxGain) is a heuristic method that uses previous knowledge about the problem to obtain the solutions. The amplifier characteristics and specifications were obtained experimentally through measurements of gain, noise figure, gain ripple and power consumption on commercially available EDFAs. We performed comparisons among these approaches and others found in the literature, and the results show that the three proposals outperformed the previous ones in terms of noise figure, gain ripple and BER. For example, in a link with 4 amplifiers the Exhaustive Method achieved a reduction of the cascade noise figure from 10.05 dB to 5.18 dB, a reduction of the gain ripple from 24.08 dB to 18.56 dB and a reduction of the BER in almost two orders of magnitude, when compared with the traditional approach, which defines the gain to compensate the loss of the previous link. However, the computation time of Exhaustive Method becomes prohibitive as the number of amplifiers in the link increases. Both Max-Gain and AsHB flex obtained similar solutions, close to the optimum operation point in a reasonable time.
Latin America Optics and Photonics Conference, 2012
We experimentally demonstrate the transmission of 80 channels over 2000km of SSMF fiber. Hybrid o... more We experimentally demonstrate the transmission of 80 channels over 2000km of SSMF fiber. Hybrid optical amplifiers (DRA couter-propagating and EDFA) were used to amplify the 112Gbps DP-QPSK channels leading to 1.14E-5 of BER after 2000km.
2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011), 2011
This paper presents a systemic simulation analysis to find the maximum reach of an optical WDM di... more This paper presents a systemic simulation analysis to find the maximum reach of an optical WDM distributed Raman amplified system evaluated in the following scenario: three different channel loads located at the C-Band, advanced modulation formats for 46 and 112 Gb/s data rates, chromatic dispersion compensation across the span and signal re-amplification carried out through optimized distributed Raman amplifiers (DRAs),
Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2013, 2013
We demonstrate cognitive gain control for EDFA operation in real-time GMPLS controlled heterogene... more We demonstrate cognitive gain control for EDFA operation in real-time GMPLS controlled heterogeneous optical testbed with 10G/100G/200G/400G lightpaths. Cognitive control maintains the network BER below FEC-limit for up to 6 dB of induced attenuation penalty.
Journal of Microwaves, Optoelectronics and Electromagnetic Applications, 2013
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC), 2013
ABSTRACT A hybrid Raman/EDF amplifier topology with a novel hybrid gain control (HGC) scheme base... more ABSTRACT A hybrid Raman/EDF amplifier topology with a novel hybrid gain control (HGC) scheme based on joint actuation to provide flattened spectral gain together with improved noise figure was developed. This paper compares the hybrid amplifier performance with the most used optical amplifier topology to provide flat spectral gain (two-stage EDFA with coupled AGC), showing an improved of equivalent noise figure (1.12-6.53 dB) with flattened spectrum for all dynamic operation range (full C-band load). The hybrid amplifier yet improve the channels output OSNR along 100km SSMF span (1.67-5.04 dB) and reduces the channels OSNR degradation, enabling its use for WDM reconfigurable optical networks with 100 Gb/s advanced modulation formats transceivers.
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC), 2013
In this paper, we analyze the EDFA adaptive gain control impact on 80 modulated C-band channels (... more In this paper, we analyze the EDFA adaptive gain control impact on 80 modulated C-band channels (10 Gbps NRZ) in a DWDM optical system composed of four cascaded amplifiers. System performance was evaluated in terms of channels optical signal-to-noise ratio (OSNR), noise figure (NF), bit error rate (BER), and gain flatness (GF) measurements. The EDFA adaptive gain control scheme aims to optimize NF and GF spectra and was improved here to prioritize one of these parameters when BER of the received signal remains under the FEC limit.
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC), 2013
ABSTRACT This paper presents a method to autonomously adjust the operating point of amplifiers in... more ABSTRACT This paper presents a method to autonomously adjust the operating point of amplifiers in a cascade using an approach based on machine learning. The goal is to smoothly adjust the gain of each amplifier in the cascade in order to reach predefined input and output power levels for the entire link, aiming to minimize both the noise figure and the gain flatness of the transmission system. The proposal uses an iterative method and performs feedforward and backward error adjustments based on local information. The experimental results indicate that our proposal can optimize the performance of the link ensuring predefined input and output power levels, which is important in a network scenario. As an example, our proposal was capable to define the gain of 6 amplifiers returning a link with a noise figure equal to 30.06 dB and a gain flatness equal to 5.26 dB, while maintaing the input and output powers around 3 dBm with an error lower than 0.1 dB.
Journal of Lightwave Technology, 2000
In this work we carry out a comprehensive experimental study on hybrid optical amplification topo... more In this work we carry out a comprehensive experimental study on hybrid optical amplification topologies (based on first order Raman and Erbium doped fiber amplifiers) for repeaterless transmission of 112 Gb/s dual polarizationquadrature phase shift keying (DP-QPSK) enabling a 4.48 Tb/s (40x112Gb/s) transmission over 302 km of standard single mode fiber with coherent detection. Hybrid optical amplification was employed for signal boosting and pre-amplification and repeaterless transmission is assured without the use of neither inline amplification nor remote optical amplifiers. The goal was to achieve the highest bandwidth-distance product for repeaterless DWDM transmission systems over legacy fiber without any inline amplification technology. The achieved result is a significant milestone, when compared to recent state-of-the-art investigations.
Journal of Microwaves, Optoelectronics and Electromagnetic Applications
Resumo—Este artigo apresenta uma metodologia para projeto de amplificadores Raman distribuídos co... more Resumo—Este artigo apresenta uma metodologia para projeto de amplificadores Raman distribuídos com múltiplos lasers de bombeio. O objetivo dessa metodologia é determinar os comprimentos de onda e os níveis de potência dos lasers de bombeio, maximizando ganho com perfil espectral plano. Utilizando as restrições físicas dos componentes ópticos, são avaliadas todas as combinações de bombeio no projeto do amplificador Raman distribuído. Foram projetados amplificadores com 2, 3 e 4 lasers de bombeio, obtendo bons resultados comparados com outros métodos de otimização utilizados na literatura. Os resultados obtidos apresentaram ganho on-off de 27,93 dB com ripple aproximado de 1 dB utilizando 3 lasers de bombeios. Palavras-Chave—amplificadores ópticos, amplificadores distribuídos, otimização, espalhamento Raman, redes WDM . Abstract—This paper presents an optimized design methodology of distributed Raman amplifiers with multiple pump lasers. The goal of this methodology is determine the p...
Journal of Microwaves, Optoelectronics and Electromagnetic Applications, 2014
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC), 2013
ABSTRACT This paper presents a method to autonomously adjust the operating point of amplifiers in... more ABSTRACT This paper presents a method to autonomously adjust the operating point of amplifiers in a cascade using an approach based on machine learning. The goal is to smoothly adjust the gain of each amplifier in the cascade in order to reach predefined input and output power levels for the entire link, aiming to minimize both the noise figure and the gain flatness of the transmission system. The proposal uses an iterative method and performs feedforward and backward error adjustments based on local information. The experimental results indicate that our proposal can optimize the performance of the link ensuring predefined input and output power levels, which is important in a network scenario. As an example, our proposal was capable to define the gain of 6 amplifiers returning a link with a noise figure equal to 30.06 dB and a gain flatness equal to 5.26 dB, while maintaing the input and output powers around 3 dBm with an error lower than 0.1 dB.
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC), 2013
In this paper, we analyze the EDFA adaptive gain control impact on 80 modulated C-band channels (... more In this paper, we analyze the EDFA adaptive gain control impact on 80 modulated C-band channels (10 Gbps NRZ) in a DWDM optical system composed of four cascaded amplifiers. System performance was evaluated in terms of channels optical signal-to-noise ratio (OSNR), noise figure (NF), bit error rate (BER), and gain flatness (GF) measurements. The EDFA adaptive gain control scheme aims to optimize NF and GF spectra and was improved here to prioritize one of these parameters when BER of the received signal remains under the FEC limit.
Journal of Microwaves, Optoelectronics and Electromagnetic Applications, 2013
2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011), 2011
This paper presents a systemic simulation analysis to find the maximum reach of an optical WDM di... more This paper presents a systemic simulation analysis to find the maximum reach of an optical WDM distributed Raman amplified system evaluated in the following scenario: three different channel loads located at the C-Band, advanced modulation formats for 46 and 112 Gb/s data rates, chromatic dispersion compensation across the span and signal re-amplification carried out through optimized distributed Raman amplifiers (DRAs),