Transmission of a net 467-Gb/s PDM-16QAM Nyquist-spaced superchannel is reported with an intra-su... more Transmission of a net 467-Gb/s PDM-16QAM Nyquist-spaced superchannel is reported with an intra-superchannel net spectral efficiency (SE) of 6.6 (b/s)/Hz, over 364-km SMF-28 ULL ultra-low loss optical fiber, enabled by bi-directional second-order Raman amplification and digital nonlinearity compensation. Multi-channel digital back-propagation (MC-DBP) was applied to compensate for nonlinear interference; an improvement of 2 dB in Q<sup>2</sup> factor was achieved when 70-GHz DBP bandwidth was applied, allowing an increase in span length of 37 km.
The achievable transmission capacity of conventional optical fibre communication systems is limit... more The achievable transmission capacity of conventional optical fibre communication systems is limited by nonlinear distortions due to the Kerr effect and the difficulty in modulating the optical field to effectively use the available fibre bandwidth. In order to achieve a high information spectral density (ISD), while simultaneously maintaining transmission reach, multi-channel fibre nonlinearity compensation and spectrally efficient data encoding must be utilised. In this work, we use a single coherent super-receiver to simultaneously receive a DP-16QAM super-channel, consisting of seven spectrally shaped 10GBd sub-carriers spaced at the Nyquist frequency. Effective nonlinearity mitigation is achieved using multi-channel digital back-propagation (MC-DBP) and this technique is combined with an optimised forward error correction implementation to demonstrate a record gain in transmission reach of 85%; increasing the maximum transmission distance from 3190 km to 5890 km, with an ISD of ...
2011 18th International Conference on Telecommunications, 2011
The performance of Optical Code/Wavelength Conversion (OCWC) switch architectures are investigate... more The performance of Optical Code/Wavelength Conversion (OCWC) switch architectures are investigated in this work. We employed hybrid technologies within in Optical Burst Switching (OBS) networks, which include wavelength and optical code division multiplexing. The simulated results demonstrate the concomitant increase of optical codes per wavelength and the utilization of Sparse Partial Optical Code/Wavelength Conversion. Both lead to a considerable decrease of the Burst Blocking Probability (BBP). In addition, such hybrid approach also improves the utilization of network resources.
ABSTRACT The performance of an WDM/OCDM switch architecture is investigated under impairment of M... more ABSTRACT The performance of an WDM/OCDM switch architecture is investigated under impairment of Multiple Access Interference (MAI). Analytical models are employed to evaluate the switch resources, such as the number of optical codes carried on each wavelength. In addition, the performance of Sparse Partial Optical Code Conversion (SPOCC) architecture is investigated using a hybrid technology, in Optical Burst Switching (OBS) networks, which employ wavelength and optical code division multiplexing. The simulation results indicate that both the increase of the number of optical codes per wavelength and the utilization SPOCC architecture, leads to considerable decrease of the Burst Blocking Probability (BBP). In addition, such hybrid approach also improves the utilization of network resources.
This paper proposes and investigates the performance of a dynamic routing and wavelength code ass... more This paper proposes and investigates the performance of a dynamic routing and wavelength code assignment (RWCA) algorithm using hybrid technology with wavelength and optical code division multiplexing (WDM/OCDM) for Optical Burst Switching (OBS) network. An OCDM-based multigranularity optical cross-connect (MG-OXC) is used to enable the better granularity in optical path (wavelength and code) switching than the wavelength-based path. The results
2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011), 2011
ABSTRACT The performance of Sparse Optical Code Conversion (SOCC) architectures is investigated i... more ABSTRACT The performance of Sparse Optical Code Conversion (SOCC) architectures is investigated in Optical Burst Switching (OBS) networks using a hybrid technology, which apply optical code and wavelength division multiplexing. The simulation results indicate that the increase of the number of optical codes and the utilization of SOCC conversion, lead to considerable decrease of the Burst Blocking Probability and latency. In addition, this hybrid technology also improves the utilization of network resources.
Resumo Neste trabalho apresenta-se uma análise de redes ópticas híbridas multiplexadas em comprim... more Resumo Neste trabalho apresenta-se uma análise de redes ópticas híbridas multiplexadas em comprimentos de onda e códigos ópticos WDM/OCDM (Wavelength Division Multiplexing/Optical Code-Division Multiplexing). Nesta análise foram apresentadas as ...
2010 Sixth Advanced International Conference on Telecommunications, 2010
This paper investigates the performance of optical code conversion architectures in hybrid techno... more This paper investigates the performance of optical code conversion architectures in hybrid technology using wavelength and optical code division multiplexing for optical burst switching network. An OCDM-based multigranularity optical cross-connect is used to enable and convert the optical path switching in bandwidth granularity finer than the wavelength-based path. Such an optical path switched by OCDM-based MG-OXC is capable of hybrid
The paper investigates the performance of a blind symbol synchronisation technique for optical OF... more The paper investigates the performance of a blind symbol synchronisation technique for optical OFDM systems based on virtual subcarriers. The test-bed includes a real-time 16-QAM OFDM transmitter operating at a net data rate of 30.65 Gb/s using a single OFDM band with a single FPGA-DAC subsystem and demonstrates transmission over 23.3 km SSMF with direct detection at a BER of 10(-3). By comparing the performance of the proposed synchronisation scheme with that of the Schmidl and Cox algorithm, it was found that the two approaches achieve similar performance for large numbers of averaging symbols, but the performance of the proposed scheme degrades as the number of averaging symbols is reduced. The proposed technique has lower complexity and bandwidth overhead as it does not rely on training sequences. Consequently, it is suitable for implementation in high speed optical OFDM transceivers.
Transmission of a net 467-Gb/s PDM-16QAM Nyquist-spaced superchannel is reported with an intra-su... more Transmission of a net 467-Gb/s PDM-16QAM Nyquist-spaced superchannel is reported with an intra-superchannel net spectral efficiency (SE) of 6.6 (b/s)/Hz, over 364-km SMF-28 ULL ultra-low loss optical fiber, enabled by bi-directional second-order Raman amplification and digital nonlinearity compensation. Multi-channel digital back-propagation (MC-DBP) was applied to compensate for nonlinear interference; an improvement of 2 dB in Q<sup>2</sup> factor was achieved when 70-GHz DBP bandwidth was applied, allowing an increase in span length of 37 km.
The achievable transmission capacity of conventional optical fibre communication systems is limit... more The achievable transmission capacity of conventional optical fibre communication systems is limited by nonlinear distortions due to the Kerr effect and the difficulty in modulating the optical field to effectively use the available fibre bandwidth. In order to achieve a high information spectral density (ISD), while simultaneously maintaining transmission reach, multi-channel fibre nonlinearity compensation and spectrally efficient data encoding must be utilised. In this work, we use a single coherent super-receiver to simultaneously receive a DP-16QAM super-channel, consisting of seven spectrally shaped 10GBd sub-carriers spaced at the Nyquist frequency. Effective nonlinearity mitigation is achieved using multi-channel digital back-propagation (MC-DBP) and this technique is combined with an optimised forward error correction implementation to demonstrate a record gain in transmission reach of 85%; increasing the maximum transmission distance from 3190 km to 5890 km, with an ISD of ...
2011 18th International Conference on Telecommunications, 2011
The performance of Optical Code/Wavelength Conversion (OCWC) switch architectures are investigate... more The performance of Optical Code/Wavelength Conversion (OCWC) switch architectures are investigated in this work. We employed hybrid technologies within in Optical Burst Switching (OBS) networks, which include wavelength and optical code division multiplexing. The simulated results demonstrate the concomitant increase of optical codes per wavelength and the utilization of Sparse Partial Optical Code/Wavelength Conversion. Both lead to a considerable decrease of the Burst Blocking Probability (BBP). In addition, such hybrid approach also improves the utilization of network resources.
ABSTRACT The performance of an WDM/OCDM switch architecture is investigated under impairment of M... more ABSTRACT The performance of an WDM/OCDM switch architecture is investigated under impairment of Multiple Access Interference (MAI). Analytical models are employed to evaluate the switch resources, such as the number of optical codes carried on each wavelength. In addition, the performance of Sparse Partial Optical Code Conversion (SPOCC) architecture is investigated using a hybrid technology, in Optical Burst Switching (OBS) networks, which employ wavelength and optical code division multiplexing. The simulation results indicate that both the increase of the number of optical codes per wavelength and the utilization SPOCC architecture, leads to considerable decrease of the Burst Blocking Probability (BBP). In addition, such hybrid approach also improves the utilization of network resources.
This paper proposes and investigates the performance of a dynamic routing and wavelength code ass... more This paper proposes and investigates the performance of a dynamic routing and wavelength code assignment (RWCA) algorithm using hybrid technology with wavelength and optical code division multiplexing (WDM/OCDM) for Optical Burst Switching (OBS) network. An OCDM-based multigranularity optical cross-connect (MG-OXC) is used to enable the better granularity in optical path (wavelength and code) switching than the wavelength-based path. The results
2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011), 2011
ABSTRACT The performance of Sparse Optical Code Conversion (SOCC) architectures is investigated i... more ABSTRACT The performance of Sparse Optical Code Conversion (SOCC) architectures is investigated in Optical Burst Switching (OBS) networks using a hybrid technology, which apply optical code and wavelength division multiplexing. The simulation results indicate that the increase of the number of optical codes and the utilization of SOCC conversion, lead to considerable decrease of the Burst Blocking Probability and latency. In addition, this hybrid technology also improves the utilization of network resources.
Resumo Neste trabalho apresenta-se uma análise de redes ópticas híbridas multiplexadas em comprim... more Resumo Neste trabalho apresenta-se uma análise de redes ópticas híbridas multiplexadas em comprimentos de onda e códigos ópticos WDM/OCDM (Wavelength Division Multiplexing/Optical Code-Division Multiplexing). Nesta análise foram apresentadas as ...
2010 Sixth Advanced International Conference on Telecommunications, 2010
This paper investigates the performance of optical code conversion architectures in hybrid techno... more This paper investigates the performance of optical code conversion architectures in hybrid technology using wavelength and optical code division multiplexing for optical burst switching network. An OCDM-based multigranularity optical cross-connect is used to enable and convert the optical path switching in bandwidth granularity finer than the wavelength-based path. Such an optical path switched by OCDM-based MG-OXC is capable of hybrid
The paper investigates the performance of a blind symbol synchronisation technique for optical OF... more The paper investigates the performance of a blind symbol synchronisation technique for optical OFDM systems based on virtual subcarriers. The test-bed includes a real-time 16-QAM OFDM transmitter operating at a net data rate of 30.65 Gb/s using a single OFDM band with a single FPGA-DAC subsystem and demonstrates transmission over 23.3 km SSMF with direct detection at a BER of 10(-3). By comparing the performance of the proposed synchronisation scheme with that of the Schmidl and Cox algorithm, it was found that the two approaches achieve similar performance for large numbers of averaging symbols, but the performance of the proposed scheme degrades as the number of averaging symbols is reduced. The proposed technique has lower complexity and bandwidth overhead as it does not rely on training sequences. Consequently, it is suitable for implementation in high speed optical OFDM transceivers.
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Papers by Lidia Galdino