Tommaso Foggi

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Jianguo Ding

Blekinge Institute of Technology

Carlos B Westphall

Universidade Federal de Santa Catarina - UFSC (Federal University of Santa Catarina)

Benny Nyambo

University of Zimbabwe

Yannis Corovesis

National Centre of Scientific Research "DEMOKRITOS"

George Papakonstantinou

National Technical University of Athens

Carlos Westphall

Universidade Federal de Santa Catarina - UFSC (Federal University of Santa Catarina)

Sotirios Xydis

National Technical University of Athens

F. Silva

Fatec

Armando Marques-Guedes

UNL - New University of Lisbon

Gwen Robbins Schug

University of North Carolina at Greensboro

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Papers by Tommaso Foggi

Signal Overlap for Efficient 1+1 Protection in Elastic Optical Networks (EONs)

Optical Fiber Communication Conference, 2017

Next steps in elasticity: Enabling signal overlap in optical networks

2016 18th International Conference on Transparent Optical Networks (ICTON), 2016

BICM and TCM Comparison in 100 Gbps Optical Coherent Links in Nonlinear Regime

Advanced Photonics, 2011

ABSTRACT The popular single-carrier QPSK modulation format is compared with 8PSK BICM and TCM sch... more

Electronic processing for optical communication systems

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Effective method for Blind Adaptive CD Compensation and Estimation in a DSP-based Coherent Optical Systems

Blind and Low Complexity CD Compensation and Estimation Method in DSP based Coherent Optical Systems

Asia Communications and Photonics Conference, 2012

ABSTRACT An accurate and low complexity blind adaptive chromatic dispersion compensation and esti... more ABSTRACT An accurate and low complexity blind adaptive chromatic dispersion compensation and estimation algorithm for coherent optical systems is proposed and experimentally validated. The method is based on a Frequency Domain Equalizer, a low complexity Butterfly Time Domain Equalizer and an Optical Performance Monitoring in a loop configuration.

Blind Adaptive Chromatic Dispersion Compensation and Estimation for DSP-Based Coherent Optical Systems

Journal of Lightwave Technology, 2000

We propose an accurate and low-complexity blind adaptive algorithm for chromatic dispersion (CD) ... more We propose an accurate and low-complexity blind adaptive algorithm for chromatic dispersion (CD) compensation and estimation in coherent optical systems. The method is based on a Frequency Domain Equalizer (FDE), a low complexity Time Domain Equalizer arranged in a butterfly structure (B-TDE) and an Optical Performance Monitoring (OPM) block in a loop configuration. The loop is such that, at each iteration, the CD value compensated by the B-TDE and estimated by the OPM is given to the FDE; according to this estimation, in the subsequent iteration, the FDE compensates also this quantity. The procedure is repeated until the majority of CD is compensated by the FDE and a small residual quantity is compensated by a low complexity B-TDE with a small number of taps. The method is extended to long haul uncompensated links exploiting the information on the mean square error (MSE) provided by the B-TDE. The proposed algorithm is then experimentally validated for a polarization multiplexed quadrature phase shift keying (PM-QPSK) signal at 112 Gbit/s propagating along 1000 km of uncompensated Z PLUS® optical fiber. A statistical analysis of the performance of the proposed solution, in terms of mean value and standard deviation of the CD estimation error, is carried out, running a set of simulations including different impairments, such as noise, polarization dependent loss, polarization mode dispersion and self-phase modulation in a line of 1000 km of uncompensated G.652 optical fiber. Our method could be used to compensate and estimate any CD quantity without increasing the number of taps in the B-TDE and exploiting devices already included in the system (TDE, FDE and OPM) arranged in a loop.

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Maximum-likelihood sequence detection with closed-form metrics in OOK optical systems impaired by GVD and PMD

by Giulio Colavolpe and Tommaso Foggi

Journal of Lightwave Technology, 2000

This paper thoroughly investigates the maximumlikelihood sequence detection (MLSD) receiver for t... more This paper thoroughly investigates the maximumlikelihood sequence detection (MLSD) receiver for the optical ON-OFF keying (OOK) channel in the presence of both polarization mode dispersion and group velocity dispersion (GVD). A reliable method is provided for computing the relevant performance for any possible value of the system parameters, with no constraint on the sampling rate. With one sample per bit time, a practically exact expression of the statistics of the received samples is found, and therefore the performance of a synchronous MLSD receiver is evaluated and compared with that of other electronic techniques such as combined feedforward and decision-feedback equalizers (FFE and DFE). It is also shown that the ultimate performance of electronic processing can be obtained by sampling the received signal at twice the bit rate. An approximate accurate closed-form expression of the receiver metrics is also identified, allowing for the implementation of a practically optimal MLSD receiver.

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Stop-and-Go Algorithm for Blind Equalization in QAM Single-Carrier Coherent Optical Systems

by Tommaso Foggi and Giulio Colavolpe

IEEE Photonics Technology Letters, 2010

Coherent detection has recently allowed the adoption of high-order modulation formats in single-c... more Coherent detection has recently allowed the adoption of high-order modulation formats in single-carrier optical systems where a simple feed-forward equalizer, in proper configuration, is able to perfectly compensate for fiber linear impairments, such as group velocity dispersion and polarization-mode dispersion. In this letter, the blind update of the equalizer taps is investigated with reference to a 16-ary quadrature amplitude modulation

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Phase Noise Sensitivity and Compensation Techniques in Long-Haul Coherent Optical Links

by Tommaso Foggi, Giulio Colavolpe, and Enrico Forestieri

Global Telecommunications Conference, . GLOBECOM . IEEE, 2010

In coherent optical systems, the phase noise due to transmit and receive lasers has a significant... more In coherent optical systems, the phase noise due to transmit and receive lasers has a significant impact on the receiver performance - the sensitivity to phase noise and the capability of electronic processing to compensate for its effects are reduced for increasing lasers'' linewidths. However, a detailed analysis of the effects of phase noise on the system performance cannot leave

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Sub-Nyquist field trial using time frequency packed DP-QPSK super-channel within fixed ITU-T grid

Optics Express

Sub-Nyquist time frequency packing technique was demonstrated for the first time in a super-chann... more Sub-Nyquist time frequency packing technique was demonstrated for the first time in a super-channel field trial transmission over long-haul distances. The technique allows a limited spectral occupancy even with low order modulation formats. The transmission was successfully performed on a deployed Australian link between Sydney and Melbourne which included 995 km of uncompensated SMF with coexistent traffic. 40 and 100 Gb/s co-propagating channels were transmitted together with the super-channel in a 50 GHz ITU-T grid without additional penalty. The super-channel consisted of eight sub-channels with low-level modulation format, i.e. DP-QPSK, guaranteeing better OSNR robustness and reduced complexity with respect to higher order formats. At the receiver side, coherent detection was used together with iterative maximum-a-posteriori (MAP) detection and decoding. A 975 Gb/s DP-QPSK super-channel was successfully transmitted between Sydney and Melbourne within four 50GHz WSS channels (20...

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Optical Time-Frequency Packing: Principles, Design, Implementation, and Experimental Demonstration

by Tommaso Foggi and Giulio Colavolpe

Journal of Lightwave Technology, 2015

Time-frequency packing (TFP) transmission provides the highest achievable spectral efficiency wit... more Time-frequency packing (TFP) transmission provides the highest achievable spectral efficiency with a constrained modulation format and detector complexity. In this work, the application of the TFP technique to fiber-optic systems is investigated and experimentally demonstrated. The main theoretical aspects, design guidelines, and implementation issues are discussed, focusing on those aspects which are peculiar to TFP systems. In particular, adaptive compensation of propagation impairments, matched filtering, and maximum a posteriori probability detection are obtained by a combination of a butterfly equalizer and four low-complexity parallel Bahl-Cocke-Jelinek-Raviv (BCJR) detectors. A novel algorithm that ensures adaptive equalization, channel estimation, and a proper distribution of tasks between the equalizer and BCJR detectors is proposed. A set of irregular low-density parity-check codes with different rates is designed to operate at low error rates and approach the spectral efficiency limit achievable by TFP at different signal-to-noise ratios. An experimental demonstration of the designed system is finally provided with five dual-polarization QPSK-modulated optical carriers, densely packed in a 100 GHz bandwidth, employing a recirculating loop to test the performance of the system at different transmission distances.

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Sub-Nyquist field trial using time frequency packed DP-QPSK super-channel within fixed ITU-T grid

Optics Express, 2015

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Adaptive Electronic Processing in Optical PMD-Impaired Systems

by Tommaso Foggi, Giulio Colavolpe, and Enrico Forestieri

IFIP International Federation for Information Processing, 2005

In high-speed optical transmission systems, one of the most challenging impairments is represente... more In high-speed optical transmission systems, one of the most challenging impairments is represented by the signal distortions produced by polarization-mode dispersion (PMD). In this paper, we analyze the limits of electronic compensation schemes, in the form of maximum-likelihood sequence detection receivers. With a constraint on the front-end processing after photo-detection, we compute the signal statistics necessary to implement this strategy. The receiver adaptivity is also discussed. The relevant performance is analyzed by means of computer simulations and accurate analytical performance bounds, and compared with the performance of all-optical compensators and decision-feedback equalizers. A significant performance loss with respect to optical compensation is observed for large values of the differential group delay (DGD) showing that, after the non reversible transformation operated by the photo-detector, it is not possible to effectively cope with the PMD-induced impairments.

Phase noise cancellation in coherent optical receivers by digital coherence enhancement

by Tommaso Foggi, Giulio Colavolpe, and Enrico Forestieri

36th European Conference and Exhibition on Optical Communication, 2010

A novel technique to cancel laser phase noise in coherent receivers is proposed. The equivalent l... more

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High spectral efficiency for long-haul optical links: time-frequency packing vs high-order constellations

by Tommaso Foggi and Giulio Colavolpe

39th European Conference and Exhibition on Optical Communication (ECOC 2013), 2000

ABSTRACT We investigate the time-frequency packing technique on long-haul optical links in order ... more

Next-generation long-haul optical links: Higher spectral efficiency through time-frequency packing

by Tommaso Foggi and Giulio Colavolpe

2013 IEEE Global Communications Conference (GLOBECOM), 2013

ABSTRACT We consider realistic long-haul optical links, where nonlinear effects represent the mai... more ABSTRACT We consider realistic long-haul optical links, where nonlinear effects represent the main impairment, and investigate the application of time-frequency packing with low-order constellations as a the most viable solution to increase the spectral efficiency. We will see that this technique allows to overcome the relevant theoretical and technological issues related to this spectral efficiency increase and is more effective than the simple adoption of high-order modulation formats which are more sensitive to nonlinear effects.

Spectral Efficiency Optimization in Flexi-Grid Long-Haul Optical Systems

by Tommaso Foggi and Giulio Colavolpe

Journal of Lightwave Technology, 2015

Flexible grid optical networks allow a better exploitation of fiber capacity, by enabling a dense... more Flexible grid optical networks allow a better exploitation of fiber capacity, by enabling a denser frequency allocation. A tighter channel spacing, however, requires narrower filters, which increase linear intersymbol interference (ISI), and may dramatically reduce system reach. Commercial coherent receivers are based on symbol by symbol detectors, which are quite sensitive to ISI. In this context, Nyquist spacing is considered as the ultimate limit to wavelength-division multiplexing (WDM) packing.

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Multilevel Optical Modulations with Closed-Form Optimal Metrics for MLSE Receiver Insensitive to GVD and PMD

by Tommaso Foggi, Giulio Colavolpe, and Enrico Forestieri

OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference, 2008

We demonstrate that, by using maximum-likelihood sequence detection with proper branch metrics an... more

Is Optical OFDM a Viable Alternative to Single-Carrier Transmission for Future Long-Haul Optical Systems?

by Tommaso Foggi, Giulio Colavolpe, and Enrico Forestieri

2010 IEEE International Conference on Communications, 2010

ABSTRACT Orthogonal frequency division multiplexing (OFDM) and single-carrier (SC) data transmiss... more ABSTRACT Orthogonal frequency division multiplexing (OFDM) and single-carrier (SC) data transmission are compared as potential candidates for the next generation coherent long-haul 100 Gbps optical communication systems. The comparison takes into account impairments either general or mainly related to coherent detection, e.g., group velocity dispersion (GVD), polarization mode dispersion (PMD), non-linear effects, phase noise due to transmit and receive lasers, uncompensated frequency offset, other synchronization aspects, overall complexity, power and spectral efficiency, technological constraints.

Signal Overlap for Efficient 1+1 Protection in Elastic Optical Networks (EONs)

Optical Fiber Communication Conference, 2017

Next steps in elasticity: Enabling signal overlap in optical networks

2016 18th International Conference on Transparent Optical Networks (ICTON), 2016

BICM and TCM Comparison in 100 Gbps Optical Coherent Links in Nonlinear Regime

Advanced Photonics, 2011

ABSTRACT The popular single-carrier QPSK modulation format is compared with 8PSK BICM and TCM sch... more

Electronic processing for optical communication systems

Download

Effective method for Blind Adaptive CD Compensation and Estimation in a DSP-based Coherent Optical Systems

Blind and Low Complexity CD Compensation and Estimation Method in DSP based Coherent Optical Systems

Asia Communications and Photonics Conference, 2012

Blind Adaptive Chromatic Dispersion Compensation and Estimation for DSP-Based Coherent Optical Systems

Journal of Lightwave Technology, 2000

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Maximum-likelihood sequence detection with closed-form metrics in OOK optical systems impaired by GVD and PMD

by Giulio Colavolpe and Tommaso Foggi

Journal of Lightwave Technology, 2000

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Stop-and-Go Algorithm for Blind Equalization in QAM Single-Carrier Coherent Optical Systems

by Tommaso Foggi and Giulio Colavolpe

IEEE Photonics Technology Letters, 2010

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Phase Noise Sensitivity and Compensation Techniques in Long-Haul Coherent Optical Links

by Tommaso Foggi, Giulio Colavolpe, and Enrico Forestieri

Global Telecommunications Conference, . GLOBECOM . IEEE, 2010

Download

Sub-Nyquist field trial using time frequency packed DP-QPSK super-channel within fixed ITU-T grid

Optics Express

Download

Optical Time-Frequency Packing: Principles, Design, Implementation, and Experimental Demonstration

by Tommaso Foggi and Giulio Colavolpe

Journal of Lightwave Technology, 2015

Download

Sub-Nyquist field trial using time frequency packed DP-QPSK super-channel within fixed ITU-T grid

Optics Express, 2015

Download

Adaptive Electronic Processing in Optical PMD-Impaired Systems

by Tommaso Foggi, Giulio Colavolpe, and Enrico Forestieri

IFIP International Federation for Information Processing, 2005

Phase noise cancellation in coherent optical receivers by digital coherence enhancement

by Tommaso Foggi, Giulio Colavolpe, and Enrico Forestieri

36th European Conference and Exhibition on Optical Communication, 2010

A novel technique to cancel laser phase noise in coherent receivers is proposed. The equivalent l... more

Download

High spectral efficiency for long-haul optical links: time-frequency packing vs high-order constellations

by Tommaso Foggi and Giulio Colavolpe

39th European Conference and Exhibition on Optical Communication (ECOC 2013), 2000

ABSTRACT We investigate the time-frequency packing technique on long-haul optical links in order ... more

Next-generation long-haul optical links: Higher spectral efficiency through time-frequency packing

by Tommaso Foggi and Giulio Colavolpe

2013 IEEE Global Communications Conference (GLOBECOM), 2013

Spectral Efficiency Optimization in Flexi-Grid Long-Haul Optical Systems

by Tommaso Foggi and Giulio Colavolpe

Journal of Lightwave Technology, 2015

Download

Multilevel Optical Modulations with Closed-Form Optimal Metrics for MLSE Receiver Insensitive to GVD and PMD

by Tommaso Foggi, Giulio Colavolpe, and Enrico Forestieri

OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference, 2008

We demonstrate that, by using maximum-likelihood sequence detection with proper branch metrics an... more

Is Optical OFDM a Viable Alternative to Single-Carrier Transmission for Future Long-Haul Optical Systems?

by Tommaso Foggi, Giulio Colavolpe, and Enrico Forestieri

2010 IEEE International Conference on Communications, 2010

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