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.
We demonstrate that, by using maximum-likelihood sequence detection with proper branch metrics an... more We demonstrate that, by using maximum-likelihood sequence detection with proper branch metrics and a proper front end, it is possible to implement multilevel optical transmissions insensitive to GVD and PMD.
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.
A novel, fast, accurate and simple method for outage probability evaluation in compensated system... more A novel, fast, accurate and simple method for outage probability evaluation in compensated systems is proposed. The Monte Carlo method is applied to Markov chains to drastically reduce the number of simulations required to estimate rare events. The accuracy is quite independent of the outage probability value to estimate, and the uncertainty can be continuously monitored and reduced at will.
2009 International Conference on Photonics in Switching, 2009
We propose a novel modulation scheme for the generation of 16-QAM optical signals. The proposed s... more We propose a novel modulation scheme for the generation of 16-QAM optical signals. The proposed scheme employs only two-level electrical driving signals and implements a quadrant differential encoding rule with minimum precoding.
Some simple recursive methods are described for constructing asymptotically exact solutions of th... more Some simple recursive methods are described for constructing asymptotically exact solutions of the nonlinear Schrödinger equation (NLSE). It is shown that the NLSE solution can be expressed analytically by two recurrence relations corresponding to two different perturbation methods.
2010 14th Conference on Optical Network Design and Modeling (ONDM), 2010
In this paper we propose and compare two different methods, based either on multicanonical Monte-... more In this paper we propose and compare two different methods, based either on multicanonical Monte-Carlo (MMC) simulations or Pearson fitting, for performance evaluation of realistic wavelength-division-multiplexed (WDM) optical transmission systems. Both methods are able to account for linear and nonlinear propagation effects, and can be applied to any modulation format. As regards MMC, we estimate the distribution of the received
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
European Conference and Exhibition on Optical Communication, 2012
ABSTRACT We demonstrate the feasibility of a novel time-frequency packing technique to implement ... more ABSTRACT We demonstrate the feasibility of a novel time-frequency packing technique to implement DP-QPSK communication with a record spectral efficiency ranging from 5.14 to 4.3 bit/s/Hz over a distance ranging from 3000 km to 5200 km of uncompensated standard fiber, respectively.
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.
We demonstrate that, by using maximum-likelihood sequence detection with proper branch metrics an... more We demonstrate that, by using maximum-likelihood sequence detection with proper branch metrics and a proper front end, it is possible to implement multilevel optical transmissions insensitive to GVD and PMD.
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.
A novel, fast, accurate and simple method for outage probability evaluation in compensated system... more A novel, fast, accurate and simple method for outage probability evaluation in compensated systems is proposed. The Monte Carlo method is applied to Markov chains to drastically reduce the number of simulations required to estimate rare events. The accuracy is quite independent of the outage probability value to estimate, and the uncertainty can be continuously monitored and reduced at will.
2009 International Conference on Photonics in Switching, 2009
We propose a novel modulation scheme for the generation of 16-QAM optical signals. The proposed s... more We propose a novel modulation scheme for the generation of 16-QAM optical signals. The proposed scheme employs only two-level electrical driving signals and implements a quadrant differential encoding rule with minimum precoding.
Some simple recursive methods are described for constructing asymptotically exact solutions of th... more Some simple recursive methods are described for constructing asymptotically exact solutions of the nonlinear Schrödinger equation (NLSE). It is shown that the NLSE solution can be expressed analytically by two recurrence relations corresponding to two different perturbation methods.
2010 14th Conference on Optical Network Design and Modeling (ONDM), 2010
In this paper we propose and compare two different methods, based either on multicanonical Monte-... more In this paper we propose and compare two different methods, based either on multicanonical Monte-Carlo (MMC) simulations or Pearson fitting, for performance evaluation of realistic wavelength-division-multiplexed (WDM) optical transmission systems. Both methods are able to account for linear and nonlinear propagation effects, and can be applied to any modulation format. As regards MMC, we estimate the distribution of the received
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
European Conference and Exhibition on Optical Communication, 2012
ABSTRACT We demonstrate the feasibility of a novel time-frequency packing technique to implement ... more ABSTRACT We demonstrate the feasibility of a novel time-frequency packing technique to implement DP-QPSK communication with a record spectral efficiency ranging from 5.14 to 4.3 bit/s/Hz over a distance ranging from 3000 km to 5200 km of uncompensated standard fiber, respectively.
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Papers by Enrico Forestieri