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Nikos Pleros - One of the best experts on this subject based on the ideXlab platform.

  • memory speed analysis of optical t flip flop circuits based on an soa mzi and a feedback loop
    International Conference on Photonics in Switching, 2012
    Co-Authors: D Fitsios, Nikos Pleros, A Miliou, C Vagionas, G T Kanellos
    Abstract:

    We demonstrate a frequency-Domain Transfer Function analysis for optical T-Flip-Flops relying on feedback loops, along with experimental verification. Our analysis confirms experimental results, showing that optimized circuit design can enable optical T-Flip-Flop memory speeds higher than 40GHz.

  • memory speed analysis of optical ram and optical flip flop circuits based on coupled soa mzi gates
    IEEE Journal of Selected Topics in Quantum Electronics, 2012
    Co-Authors: D Fitsios, K Vyrsokinos, A Miliou, Nikos Pleros
    Abstract:

    We demonstrate analytical frequency-Domain Transfer Function expressions for an optical random access memory (RAM) cell that employs two SOA-based ON/OFF switches and two coupled SOA-MZI gates forming an optical flip-flop. Our theoretical model relies on first-order perturbation theory approximations applied for the first time to coupled optical switching structures, resulting to an optical RAM cell frequency response that allows for a qualitative and quantitative analysis of optical RAM memory speed and performance characteristics and their dependence on certain RAM cell device parameters. We show that the Transfer Function of an optical RAM cell and its incorporated flip-flop device exhibits periodic resonance frequencies resembling the behavior of optical ring resonator configurations. Its free spectral range is mainly dictated by the length of the waveguide that enables the coupling of the two SOA-MZI gates, yielding this coupling length as the dominant memory speed determining factor. The obtained results are in close agreement with experimental observations, demonstrating that optimized RAM cell designs with waveguide coupling lengths lower than 5 mm can enable RAM operation at memory speeds well beyond 40 GHz.

  • soa mzi based nonlinear optical signal processing a frequency Domain Transfer Function for wavelength conversion clock recovery and packet envelope detection
    IEEE Journal of Quantum Electronics, 2011
    Co-Authors: Maria Spyropoulou, Nikos Pleros, A Miliou
    Abstract:

    We present analytic expressions for the frequency-Domain Transfer Function of semiconductor optical amplifier Mach-Zehnder interferometric (SOA-MZI) switches that employ a single optical control signal and a continuous wave input optical beam. Our analysis relies on first-order perturbation theory approximations applied both to the SOA response as well as to the SOA-MZI characteristics, yielding a frequency response that enables a qualitative insight into the different SOA-MZI operational regimes. The final Transfer Function expression is utilized for the analysis and evaluation of the multiFunctional potential of SOA-MZI switches, concluding with the necessary conditions for supporting a number of completely different SOA-MZI-based nonlinear signal processing applications that have been demonstrated experimentally: wavelength conversion, packet envelope detection (PED), and clock recovery (CR). The theoretically obtained operational conditions are in close agreement with experimental observations, showing that SOA-MZIs can serve as Functional circuit elements in applications with different requirements depending on its operational parameters: as low-pass filtering devices with cut-off frequencies in the megahertz regime or in the multi-gigahertz regime, and as resonant modules resembling band-pass filtering structures. The validity of our theoretical SOA-MZI frequency-Domain system model is further confirmed by its successful incorporation in a Fabry-Perot assisted SOA-MZI subsystem, demonstrating PED and CR operations through the exploitation of typical systems theory tools.

  • Transfer Function and Toggling Speed Analysis of an Optical Flip-Flop Based on Coupled SOA-MZIs
    Integrated Photonics Research Silicon and Nanophotonics and Photonics in Switching, 2010
    Co-Authors: D Fitsios, K Vyrsokinos, Nikos Pleros
    Abstract:

    We derive an analytical expression for the frequency-Domain Transfer Function of an optical flip-flop relying on two coupled SOA-MZIs, demonstrating qualitative and quantitative toggling speed performance analysis for different coupling lengths between the two MZIs.

  • Small-signal analysis of SOA-MZI-based NRZ wavelength conversion configurations
    2009 International Conference on Photonics in Switching, 2009
    Co-Authors: Maria Spyropoulou, Georgios I. Papadimitriou, Nikos Pleros, Ioannis Tomkos
    Abstract:

    We present analytical expressions for the frequency Domain Transfer Function of three different SOA-MZI wavelength conversion schemes providing insight into their modulation bandwidth and speed capabilities for NRZ signal wavelength conversion applications.

A Miliou - One of the best experts on this subject based on the ideXlab platform.

  • memory speed analysis of optical t flip flop circuits based on an soa mzi and a feedback loop
    International Conference on Photonics in Switching, 2012
    Co-Authors: D Fitsios, Nikos Pleros, A Miliou, C Vagionas, G T Kanellos
    Abstract:

    We demonstrate a frequency-Domain Transfer Function analysis for optical T-Flip-Flops relying on feedback loops, along with experimental verification. Our analysis confirms experimental results, showing that optimized circuit design can enable optical T-Flip-Flop memory speeds higher than 40GHz.

  • memory speed analysis of optical ram and optical flip flop circuits based on coupled soa mzi gates
    IEEE Journal of Selected Topics in Quantum Electronics, 2012
    Co-Authors: D Fitsios, K Vyrsokinos, A Miliou, Nikos Pleros
    Abstract:

    We demonstrate analytical frequency-Domain Transfer Function expressions for an optical random access memory (RAM) cell that employs two SOA-based ON/OFF switches and two coupled SOA-MZI gates forming an optical flip-flop. Our theoretical model relies on first-order perturbation theory approximations applied for the first time to coupled optical switching structures, resulting to an optical RAM cell frequency response that allows for a qualitative and quantitative analysis of optical RAM memory speed and performance characteristics and their dependence on certain RAM cell device parameters. We show that the Transfer Function of an optical RAM cell and its incorporated flip-flop device exhibits periodic resonance frequencies resembling the behavior of optical ring resonator configurations. Its free spectral range is mainly dictated by the length of the waveguide that enables the coupling of the two SOA-MZI gates, yielding this coupling length as the dominant memory speed determining factor. The obtained results are in close agreement with experimental observations, demonstrating that optimized RAM cell designs with waveguide coupling lengths lower than 5 mm can enable RAM operation at memory speeds well beyond 40 GHz.

  • soa mzi based nonlinear optical signal processing a frequency Domain Transfer Function for wavelength conversion clock recovery and packet envelope detection
    IEEE Journal of Quantum Electronics, 2011
    Co-Authors: Maria Spyropoulou, Nikos Pleros, A Miliou
    Abstract:

    We present analytic expressions for the frequency-Domain Transfer Function of semiconductor optical amplifier Mach-Zehnder interferometric (SOA-MZI) switches that employ a single optical control signal and a continuous wave input optical beam. Our analysis relies on first-order perturbation theory approximations applied both to the SOA response as well as to the SOA-MZI characteristics, yielding a frequency response that enables a qualitative insight into the different SOA-MZI operational regimes. The final Transfer Function expression is utilized for the analysis and evaluation of the multiFunctional potential of SOA-MZI switches, concluding with the necessary conditions for supporting a number of completely different SOA-MZI-based nonlinear signal processing applications that have been demonstrated experimentally: wavelength conversion, packet envelope detection (PED), and clock recovery (CR). The theoretically obtained operational conditions are in close agreement with experimental observations, showing that SOA-MZIs can serve as Functional circuit elements in applications with different requirements depending on its operational parameters: as low-pass filtering devices with cut-off frequencies in the megahertz regime or in the multi-gigahertz regime, and as resonant modules resembling band-pass filtering structures. The validity of our theoretical SOA-MZI frequency-Domain system model is further confirmed by its successful incorporation in a Fabry-Perot assisted SOA-MZI subsystem, demonstrating PED and CR operations through the exploitation of typical systems theory tools.

Eric B Hekler - One of the best experts on this subject based on the ideXlab platform.

  • an identification test monitoring procedure for mimo systems based on statistical uncertainty estimation
    Conference on Decision and Control, 2015
    Co-Authors: Cesar A Martin, Daniel E Rivera, Eric B Hekler
    Abstract:

    This paper presents an identification test monitoring procedure for multivariable systems whose purpose is to define an experiment that is both sufficiently informative for identification purposes and of the shortest duration possible, given predefined levels of accuracy in the model. The procedure relies on uncertainty regions resulting from frequency-Domain Transfer Function estimation that is performed during experimental execution. To obtain independent-in-frequency signals for estimation, input design relying on multi-sinusoidal signals with “zippered” power spectra is developed. Given the various approaches available for computing statistically-based uncertainty in the frequency Domain, the method that offers the most general conditions with the least a priori information about the output noise structure is selected. Based on the computed uncertainties and user-defined bounds, a stopping criterion for the identification test is developed. Results are evaluated with a simulation study involving a representative process model. This includes a performance evaluation of the technique under various distinct noise models.

  • CDC - An identification test monitoring procedure for MIMO systems based on statistical uncertainty estimation
    2015 54th IEEE Conference on Decision and Control (CDC), 2015
    Co-Authors: Cesar A Martin, Daniel E Rivera, Eric B Hekler
    Abstract:

    This paper presents an identification test monitoring procedure for multivariable systems whose purpose is to define an experiment that is both sufficiently informative for identification purposes and of the shortest duration possible, given predefined levels of accuracy in the model. The procedure relies on uncertainty regions resulting from frequency-Domain Transfer Function estimation that is performed during experimental execution. To obtain independent-in-frequency signals for estimation, input design relying on multi-sinusoidal signals with “zippered” power spectra is developed. Given the various approaches available for computing statistically-based uncertainty in the frequency Domain, the method that offers the most general conditions with the least a priori information about the output noise structure is selected. Based on the computed uncertainties and user-defined bounds, a stopping criterion for the identification test is developed. Results are evaluated with a simulation study involving a representative process model. This includes a performance evaluation of the technique under various distinct noise models.

Maria Spyropoulou - One of the best experts on this subject based on the ideXlab platform.

  • soa mzi based nonlinear optical signal processing a frequency Domain Transfer Function for wavelength conversion clock recovery and packet envelope detection
    IEEE Journal of Quantum Electronics, 2011
    Co-Authors: Maria Spyropoulou, Nikos Pleros, A Miliou
    Abstract:

    We present analytic expressions for the frequency-Domain Transfer Function of semiconductor optical amplifier Mach-Zehnder interferometric (SOA-MZI) switches that employ a single optical control signal and a continuous wave input optical beam. Our analysis relies on first-order perturbation theory approximations applied both to the SOA response as well as to the SOA-MZI characteristics, yielding a frequency response that enables a qualitative insight into the different SOA-MZI operational regimes. The final Transfer Function expression is utilized for the analysis and evaluation of the multiFunctional potential of SOA-MZI switches, concluding with the necessary conditions for supporting a number of completely different SOA-MZI-based nonlinear signal processing applications that have been demonstrated experimentally: wavelength conversion, packet envelope detection (PED), and clock recovery (CR). The theoretically obtained operational conditions are in close agreement with experimental observations, showing that SOA-MZIs can serve as Functional circuit elements in applications with different requirements depending on its operational parameters: as low-pass filtering devices with cut-off frequencies in the megahertz regime or in the multi-gigahertz regime, and as resonant modules resembling band-pass filtering structures. The validity of our theoretical SOA-MZI frequency-Domain system model is further confirmed by its successful incorporation in a Fabry-Perot assisted SOA-MZI subsystem, demonstrating PED and CR operations through the exploitation of typical systems theory tools.

  • Small-signal analysis of SOA-MZI-based NRZ wavelength conversion configurations
    2009 International Conference on Photonics in Switching, 2009
    Co-Authors: Maria Spyropoulou, Georgios I. Papadimitriou, Nikos Pleros, Ioannis Tomkos
    Abstract:

    We present analytical expressions for the frequency Domain Transfer Function of three different SOA-MZI wavelength conversion schemes providing insight into their modulation bandwidth and speed capabilities for NRZ signal wavelength conversion applications.

  • Small-signal analysis of SOA-MZI and applications in nonlinear signal processing
    2009 IEEE LEOS Summer Topical Meeting, 2009
    Co-Authors: Nikos Pleros, Maria Spyropoulou, G. I. Papadimitriou
    Abstract:

    For the first time, we derive the frequency-Domain Transfer Function of SOA-based MZI configurations based on small-signal gain analysis using simplified analytical expressions for the SOAs response, providing qualitative insight for various non-linear optical applications.

Rik Pintelon - One of the best experts on this subject based on the ideXlab platform.

  • Technical Communique: Generating robust starting values for frequency-Domain Transfer Function estimation
    Automatica, 1999
    Co-Authors: Yves Rolain, Rik Pintelon
    Abstract:

    This paper proposes a frequency-dependent weighting Function that, when used together with the classical starting value algorithms (linear least squares, total least squares,...), improves starting values for frequency-Domain identification of parametric rational Transfer Function models. The idea behind the method is to approximate the weighting of the maximum likelihood estimator without prior knowledge of the model parameters. The proposed weighting scheme is applied to simulation and measurement data. Enhanced parameter estimates are obtained even for wide band, high-order systems with large Transfer Function dynamics.