Daniel Fonseca | Coriant R&D (original) (raw)

Papers by Daniel Fonseca

Research paper thumbnail of Comparison between DWDM Transmission Systems over SMF and NZDSF 25×40Gb/s Signals and 50GHz Channel Spacing

The use of new types of fibre with high density and high capacity dense wavelength division multi... more The use of new types of fibre with high density and high capacity dense wavelength division multiplexing (DWDM) systems leads to the investigation of system performance with these fibres. This paper compares the performance of a high-density (0.8bits/s/Hz) DWDM transmission system with 25 channels and 40Gb/s per channel with a channel spacing of 50GHz, using conventional single-mode fibre or non-zero dispersion shifted fibre (NZDSF). For this, semi-analytical simulation of the DWDM system is performed using rigorous models for optical multiplexer and external modulator. Nonlinear transmission phenomena in the fibre are also included in the simulation. The results show that NZDSF allows significant extension of reachable distances with dispersion compensation and in-line amplification.

Research paper thumbnail of Dependence of reduced model of SPM-limited dispersion managed systems on transmission fiber parameters

Research paper thumbnail of Design and performance of AWG multiplexer / demultiplexer in WDM systems

This paper addresses the design of arrayed waveguide grating (AWG) devices from the viewpoint of ... more This paper addresses the design of arrayed waveguide grating (AWG) devices from the viewpoint of -3dB bandwidth and free spectral range. A straightforward numerical method of obtaining the physical dimensions of a real device for given -3dB bandwidth and free spectral range is presented. The paper assesses also the influence of the -3dB bandwidth of the AWG on the performance of a dense wavelength division multiplexing system with 25 channels, channel spacing of 50GHz and full width half maximum of 40GHz. _____________________________________________________________________

Research paper thumbnail of Corrections to

IEEE Photonics Technology Letters

Research paper thumbnail of 40 Gbit/s OSSB-NRZ transmitter for high capacity systems

31st European Conference on Optical Communications (ECOC 2005), 2005

ABSTRACT

Research paper thumbnail of Site-Dependent Pumping Effect on Two-Level EDFAs

Journal of Lightwave Technology, 2015

ABSTRACT The impact of site-dependent pumping (SDP) on the performance of erbium-doped fiber ampl... more ABSTRACT The impact of site-dependent pumping (SDP) on the performance of erbium-doped fiber amplifiers (EDFAs) pumped at wavelengths around 1480 nm is investigated, both experimentally and numerically. An improved numerical model incorporating the SDP effect for two-level EDFAs is derived and experimentally validated. We confirm by comparing with experimental data that the proposed model accurately describes the dependence of the amplifier gain spectrum on the pump wavelength and pump power. We conclude that SDP has a significant impact on the dynamic response of an EDFA due to input spectral variations and should be considered when simulating high performance links.

Research paper thumbnail of Transmission improvements using electrical dispersion compensation at the transmitter side and RZ pulse format in optical single sideband systems

Proceedings of 2005 7th International Conference on Transparent Optical Networks, ICTON 2005, 2005

ABSTRACT

Research paper thumbnail of On the transition to pseudo-linear regime in dispersion managed systems with NRZ, RZ and duobinary signal formats

IEE Proceedings: Optoelectronics, 2005

ABSTRACT

Research paper thumbnail of Comparison of implementations using the phase shift technique to generate OSSB-NRZ and OSSB-RZ signals

Proceedings of 2005 7th International Conference on Transparent Optical Networks, ICTON 2005, 2005

-Motivation -Phase-shift technique to generate OSSB signals -Implementation of OSSB transmitters ... more -Motivation -Phase-shift technique to generate OSSB signals -Implementation of OSSB transmitters based on the phase-shift technique -Theoretical results -Conclusion Daniel Fonseca et. al., "Comparison of Implementations Using the Phase Shift Technique to Generate OSSB-NRZ and OSSB-RZ Signals", ICTON 2005 Motivation (I) -Study of spectrally efficient signal formats to increase the transmission capacity. -OSSB (optical single sideband) modulation advantages: § Reduction to one half the optical bandwidth used by conventional double sideband formats § Increased tolerance to group velocity dispersion § Doubles the number of channels in wavelength division multiplexing systems -Combining OSSB with carrier-unsuppressed optical signals allows efficient electrical dispersion compensation after direct detection Daniel Fonseca et. al., "Comparison of Implementations Using the Phase Shift Technique to Generate OSSB-NRZ and OSSB-RZ Signals", ICTON 2005 Motivation (II)

Research paper thumbnail of Modelling and experimental validation of an x-cut four phase modulators structure

IEE Proceedings: Optoelectronics, 2006

ABSTRACT

Research paper thumbnail of Electronic channel equalization techniques

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 2009

Abstract. This paper presents the key design approaches and results in the field of optical impai... more Abstract. This paper presents the key design approaches and results in the field of optical impairment distortion compensation by electronic means, as an outcome of the studies and research innovations developed within the COST 291 action. The research topics addressed are related with chromatic dispersion and nonlinearities, with particular reference on FFE/DFE and MLSE-based equalizers as well as with the assistance of different modulation formats. Additionally, the use of electronic compensation in metroaccess applications is ...

Research paper thumbnail of Analysis of optimum dispersion maps for DQPSK systems

2010 12th International Conference on Transparent Optical Networks, ICTON 2010, 2010

Abstract The optimum dispersion maps (ODMs) for 43 Gbit/s DQPSK systems are analyzed using a semi... more Abstract The optimum dispersion maps (ODMs) for 43 Gbit/s DQPSK systems are analyzed using a semi-analytical simulation method. We show that the ODMs for DQPSK systems show reduced dependence on the duty-cycle of the transmitted signal and nonlinear ...

Research paper thumbnail of Influence of local oscillator-to-signal power ratio on the gaussianity of CP-QPSK signal statistics

International Conference on Transparent Optical Networks, 2011

The statistics of quadrature phase-shift keying with coherent-detection and polarization multiple... more The statistics of quadrature phase-shift keying with coherent-detection and polarization multiplexing (CP-QPSK) signal at the decision circuit input is assessed by numerical simulation for different local oscillator-to-signal (LO/S) power ratios. It is shown that the signal statistics at the decision circuit input is approximately Gaussian distributed for high LO/S power ratios. However, the mean and variance of the Gaussian distribution that approximates the statistics of each symbol depend on the transmitted symbol sequence, especially for low LO/S power ratios, demonstrating the impact of the waveform on the statistics of the detected signal. Moreover, the signal statistics starts to deviate from Gaussian for LO/S power ratios below 17 dB. A semi-analytical simulation method (SASM) based on the Gaussian approximation for the signal statistics at the decision circuit input is used for performance evaluation of CP-QPSK system. The accuracy of the SASM is assessed for different LO/S power ratios by comparison with Monte-Carlo (MC) simulation results. The SASM shows good agreement with MC simulation results for LO/S power ratios between 6 and 30 dB.

Research paper thumbnail of Highly linear radio-over-fiber transmitter for subcarrier multiplexed systems

2008 34th European Conference on Optical Communication, 2008

A highly linear RoF transmitter, employing a dual Mach-Zehnder modulator, is proposed and experim... more A highly linear RoF transmitter, employing a dual Mach-Zehnder modulator, is proposed and experimentally tested. Carrier to interference ratio improvement of 16 dB, compared to conventional external modulation, is reported.

Research paper thumbnail of Influence of spectrum location of Gigabit-Ethernet in coexistence with multi-band OFDM-UWB wireless signals on the long-reach PON performance using directly modulated lasers

2011 International Topical Meeting on Microwave Photonics jointly held with the 2011 Asia-Pacific Microwave Photonics Conference, 2011

Abstract The influence of spectrum location of OFDM-based Gigabit-Ethernet (GbE) in coexistence w... more Abstract The influence of spectrum location of OFDM-based Gigabit-Ethernet (GbE) in coexistence with multi-band OFDM-UWB wireless signals on the performance of long-reach PON using directly modulated lasers is experimentally evaluated. It is shown that the ...

Research paper thumbnail of Multi-band UWB signals transmission improvement due to pre-emphasis in LR-PONs using DMLs

IEEE Photonic Society 24th Annual Meeting, 2011

ABSTRACT The impact of pre-emphasis on the performance of multi-band OFDM-UWB signals in LR-PONs ... more ABSTRACT The impact of pre-emphasis on the performance of multi-band OFDM-UWB signals in LR-PONs using directly modulated lasers is evaluated. BER improvement from 10-4 to less than 10-6 is experimentally observed after 100 km of SSMF.

Research paper thumbnail of Transmission of coexisting OFDM-baseband and multi-band OFDM-UWB signals along LR-PONs using DMLs

IEEE Photonic Society 24th Annual Meeting, 2011

ABSTRACT Transmission of coexisting OFDM-baseband and multi-band OFDM-UWB signals along LR-PONs u... more ABSTRACT Transmission of coexisting OFDM-baseband and multi-band OFDM-UWB signals along LR-PONs using DMLs is experimentally demonstrated. Reach of 100 km of SSMF is achieved with BERs below 10-3 and an OSNR of 25 dB@0.1 nm.

Research paper thumbnail of A perspective on optical-wireless converged NG-FTTH networks using directly modulated lasers

2011 13th International Conference on Transparent Optical Networks, 2011

Abstract OFDM-based next generation fiber to the home (NG-FTTH) networks using directly modulated... more Abstract OFDM-based next generation fiber to the home (NG-FTTH) networks using directly modulated lasers (DMLs) have been proposed as a solution to deliver quintuple play services addressing cost-effective optical-wireless convergence. In this article, we ...

Research paper thumbnail of Transmission of Multi-Band OFDM-UWB Signals along NG-FTTH Networks using Directly Modulated Lasers

Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2011, 2011

Transmission of multi-band OFDM-UWB signals along FTTH networks using directly modulated lasers i... more Transmission of multi-band OFDM-UWB signals along FTTH networks using directly modulated lasers is experimentally evaluated. Reach of 100 km of standard SMF is achieved with a BER below 10 -4 and an OSNR of 25 dB.

Research paper thumbnail of Asynchronous sampled amplitude histogram models for optical performance monitoring in high-speed networks

Journal of Optical Networking, 2004

RECEIVED 31 OCTOBER 2003; REVISED 11 JUNE 2004; ACCEPTED 30 JUNE 2004; PUBLISHED 20 JULY 2004 A m... more RECEIVED 31 OCTOBER 2003; REVISED 11 JUNE 2004; ACCEPTED 30 JUNE 2004; PUBLISHED 20 JULY 2004 A methodology that allows us to characterize the main performance parameters of high-rate (up to 40Gbit/s) systems based on slow, bit-rate-independent sampling is ...

Research paper thumbnail of Comparison between DWDM Transmission Systems over SMF and NZDSF 25×40Gb/s Signals and 50GHz Channel Spacing

The use of new types of fibre with high density and high capacity dense wavelength division multi... more The use of new types of fibre with high density and high capacity dense wavelength division multiplexing (DWDM) systems leads to the investigation of system performance with these fibres. This paper compares the performance of a high-density (0.8bits/s/Hz) DWDM transmission system with 25 channels and 40Gb/s per channel with a channel spacing of 50GHz, using conventional single-mode fibre or non-zero dispersion shifted fibre (NZDSF). For this, semi-analytical simulation of the DWDM system is performed using rigorous models for optical multiplexer and external modulator. Nonlinear transmission phenomena in the fibre are also included in the simulation. The results show that NZDSF allows significant extension of reachable distances with dispersion compensation and in-line amplification.

Research paper thumbnail of Dependence of reduced model of SPM-limited dispersion managed systems on transmission fiber parameters

Research paper thumbnail of Design and performance of AWG multiplexer / demultiplexer in WDM systems

This paper addresses the design of arrayed waveguide grating (AWG) devices from the viewpoint of ... more This paper addresses the design of arrayed waveguide grating (AWG) devices from the viewpoint of -3dB bandwidth and free spectral range. A straightforward numerical method of obtaining the physical dimensions of a real device for given -3dB bandwidth and free spectral range is presented. The paper assesses also the influence of the -3dB bandwidth of the AWG on the performance of a dense wavelength division multiplexing system with 25 channels, channel spacing of 50GHz and full width half maximum of 40GHz. _____________________________________________________________________

Research paper thumbnail of Corrections to

IEEE Photonics Technology Letters

Research paper thumbnail of 40 Gbit/s OSSB-NRZ transmitter for high capacity systems

31st European Conference on Optical Communications (ECOC 2005), 2005

ABSTRACT

Research paper thumbnail of Site-Dependent Pumping Effect on Two-Level EDFAs

Journal of Lightwave Technology, 2015

ABSTRACT The impact of site-dependent pumping (SDP) on the performance of erbium-doped fiber ampl... more ABSTRACT The impact of site-dependent pumping (SDP) on the performance of erbium-doped fiber amplifiers (EDFAs) pumped at wavelengths around 1480 nm is investigated, both experimentally and numerically. An improved numerical model incorporating the SDP effect for two-level EDFAs is derived and experimentally validated. We confirm by comparing with experimental data that the proposed model accurately describes the dependence of the amplifier gain spectrum on the pump wavelength and pump power. We conclude that SDP has a significant impact on the dynamic response of an EDFA due to input spectral variations and should be considered when simulating high performance links.

Research paper thumbnail of Transmission improvements using electrical dispersion compensation at the transmitter side and RZ pulse format in optical single sideband systems

Proceedings of 2005 7th International Conference on Transparent Optical Networks, ICTON 2005, 2005

ABSTRACT

Research paper thumbnail of On the transition to pseudo-linear regime in dispersion managed systems with NRZ, RZ and duobinary signal formats

IEE Proceedings: Optoelectronics, 2005

ABSTRACT

Research paper thumbnail of Comparison of implementations using the phase shift technique to generate OSSB-NRZ and OSSB-RZ signals

Proceedings of 2005 7th International Conference on Transparent Optical Networks, ICTON 2005, 2005

-Motivation -Phase-shift technique to generate OSSB signals -Implementation of OSSB transmitters ... more -Motivation -Phase-shift technique to generate OSSB signals -Implementation of OSSB transmitters based on the phase-shift technique -Theoretical results -Conclusion Daniel Fonseca et. al., "Comparison of Implementations Using the Phase Shift Technique to Generate OSSB-NRZ and OSSB-RZ Signals", ICTON 2005 Motivation (I) -Study of spectrally efficient signal formats to increase the transmission capacity. -OSSB (optical single sideband) modulation advantages: § Reduction to one half the optical bandwidth used by conventional double sideband formats § Increased tolerance to group velocity dispersion § Doubles the number of channels in wavelength division multiplexing systems -Combining OSSB with carrier-unsuppressed optical signals allows efficient electrical dispersion compensation after direct detection Daniel Fonseca et. al., "Comparison of Implementations Using the Phase Shift Technique to Generate OSSB-NRZ and OSSB-RZ Signals", ICTON 2005 Motivation (II)

Research paper thumbnail of Modelling and experimental validation of an x-cut four phase modulators structure

IEE Proceedings: Optoelectronics, 2006

ABSTRACT

Research paper thumbnail of Electronic channel equalization techniques

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 2009

Abstract. This paper presents the key design approaches and results in the field of optical impai... more Abstract. This paper presents the key design approaches and results in the field of optical impairment distortion compensation by electronic means, as an outcome of the studies and research innovations developed within the COST 291 action. The research topics addressed are related with chromatic dispersion and nonlinearities, with particular reference on FFE/DFE and MLSE-based equalizers as well as with the assistance of different modulation formats. Additionally, the use of electronic compensation in metroaccess applications is ...

Research paper thumbnail of Analysis of optimum dispersion maps for DQPSK systems

2010 12th International Conference on Transparent Optical Networks, ICTON 2010, 2010

Abstract The optimum dispersion maps (ODMs) for 43 Gbit/s DQPSK systems are analyzed using a semi... more Abstract The optimum dispersion maps (ODMs) for 43 Gbit/s DQPSK systems are analyzed using a semi-analytical simulation method. We show that the ODMs for DQPSK systems show reduced dependence on the duty-cycle of the transmitted signal and nonlinear ...

Research paper thumbnail of Influence of local oscillator-to-signal power ratio on the gaussianity of CP-QPSK signal statistics

International Conference on Transparent Optical Networks, 2011

The statistics of quadrature phase-shift keying with coherent-detection and polarization multiple... more The statistics of quadrature phase-shift keying with coherent-detection and polarization multiplexing (CP-QPSK) signal at the decision circuit input is assessed by numerical simulation for different local oscillator-to-signal (LO/S) power ratios. It is shown that the signal statistics at the decision circuit input is approximately Gaussian distributed for high LO/S power ratios. However, the mean and variance of the Gaussian distribution that approximates the statistics of each symbol depend on the transmitted symbol sequence, especially for low LO/S power ratios, demonstrating the impact of the waveform on the statistics of the detected signal. Moreover, the signal statistics starts to deviate from Gaussian for LO/S power ratios below 17 dB. A semi-analytical simulation method (SASM) based on the Gaussian approximation for the signal statistics at the decision circuit input is used for performance evaluation of CP-QPSK system. The accuracy of the SASM is assessed for different LO/S power ratios by comparison with Monte-Carlo (MC) simulation results. The SASM shows good agreement with MC simulation results for LO/S power ratios between 6 and 30 dB.

Research paper thumbnail of Highly linear radio-over-fiber transmitter for subcarrier multiplexed systems

2008 34th European Conference on Optical Communication, 2008

A highly linear RoF transmitter, employing a dual Mach-Zehnder modulator, is proposed and experim... more A highly linear RoF transmitter, employing a dual Mach-Zehnder modulator, is proposed and experimentally tested. Carrier to interference ratio improvement of 16 dB, compared to conventional external modulation, is reported.

Research paper thumbnail of Influence of spectrum location of Gigabit-Ethernet in coexistence with multi-band OFDM-UWB wireless signals on the long-reach PON performance using directly modulated lasers

2011 International Topical Meeting on Microwave Photonics jointly held with the 2011 Asia-Pacific Microwave Photonics Conference, 2011

Abstract The influence of spectrum location of OFDM-based Gigabit-Ethernet (GbE) in coexistence w... more Abstract The influence of spectrum location of OFDM-based Gigabit-Ethernet (GbE) in coexistence with multi-band OFDM-UWB wireless signals on the performance of long-reach PON using directly modulated lasers is experimentally evaluated. It is shown that the ...

Research paper thumbnail of Multi-band UWB signals transmission improvement due to pre-emphasis in LR-PONs using DMLs

IEEE Photonic Society 24th Annual Meeting, 2011

ABSTRACT The impact of pre-emphasis on the performance of multi-band OFDM-UWB signals in LR-PONs ... more ABSTRACT The impact of pre-emphasis on the performance of multi-band OFDM-UWB signals in LR-PONs using directly modulated lasers is evaluated. BER improvement from 10-4 to less than 10-6 is experimentally observed after 100 km of SSMF.

Research paper thumbnail of Transmission of coexisting OFDM-baseband and multi-band OFDM-UWB signals along LR-PONs using DMLs

IEEE Photonic Society 24th Annual Meeting, 2011

ABSTRACT Transmission of coexisting OFDM-baseband and multi-band OFDM-UWB signals along LR-PONs u... more ABSTRACT Transmission of coexisting OFDM-baseband and multi-band OFDM-UWB signals along LR-PONs using DMLs is experimentally demonstrated. Reach of 100 km of SSMF is achieved with BERs below 10-3 and an OSNR of 25 dB@0.1 nm.

Research paper thumbnail of A perspective on optical-wireless converged NG-FTTH networks using directly modulated lasers

2011 13th International Conference on Transparent Optical Networks, 2011

Abstract OFDM-based next generation fiber to the home (NG-FTTH) networks using directly modulated... more Abstract OFDM-based next generation fiber to the home (NG-FTTH) networks using directly modulated lasers (DMLs) have been proposed as a solution to deliver quintuple play services addressing cost-effective optical-wireless convergence. In this article, we ...

Research paper thumbnail of Transmission of Multi-Band OFDM-UWB Signals along NG-FTTH Networks using Directly Modulated Lasers

Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2011, 2011

Transmission of multi-band OFDM-UWB signals along FTTH networks using directly modulated lasers i... more Transmission of multi-band OFDM-UWB signals along FTTH networks using directly modulated lasers is experimentally evaluated. Reach of 100 km of standard SMF is achieved with a BER below 10 -4 and an OSNR of 25 dB.

Research paper thumbnail of Asynchronous sampled amplitude histogram models for optical performance monitoring in high-speed networks

Journal of Optical Networking, 2004

RECEIVED 31 OCTOBER 2003; REVISED 11 JUNE 2004; ACCEPTED 30 JUNE 2004; PUBLISHED 20 JULY 2004 A m... more RECEIVED 31 OCTOBER 2003; REVISED 11 JUNE 2004; ACCEPTED 30 JUNE 2004; PUBLISHED 20 JULY 2004 A methodology that allows us to characterize the main performance parameters of high-rate (up to 40Gbit/s) systems based on slow, bit-rate-independent sampling is ...