C. Porzi

Scuola Superiore Sant'Anna, Pisa, Tuscany, Italy

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Publications (72)48.24 Total impact

  • F. Fresi · N. Sambo · C. Porzi · G. Meloni · A. Bogoni · L. Poti ·
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    ABSTRACT: We investigate the use of high-order sum-difference all-pass microring filters for switching applications in circuit-switched elastic optical networks. A practical design taking into account optical losses accordingly to typical reported values for strip-waveguides in silicon-on-insulator technology is considered. Simulations performed on 30 Gbaud Nyquist PM-QPSK signals show that the proposed structure can achieve similar or better performance than commercial spectrum selective switch filters. Induced OSNR penalty per node due to filtering can be reduced with the adoption of these filters, thus increasing the maximum number of nodes that can be traversed before signal is corrupted. Filters programmability in terms of bandwidth is also investigated. © 2015 International Federation for Information Processing (IFIP).
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    ABSTRACT: This work shows the concept, performance, and field-trials of the first photonics-based radar. The comparative in-field experiments in aerial and naval scenarios against a state-of-the-art commercial system show the photonics potentials in enabling software-defined radars.
  • N Sambo · V Vercesi · M Imran · P Castoldi · A D'Errico · C Porzi · F Cugini · A Bogoni · L Poti ·
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    ABSTRACT: Multi-flow transponder in elastic optical networks has been recently proposed as a flexible class of transponder that is able to generate multiple optical flows. Multi-flow transponders may support slice-ability, i.e. flows can be flexibly associated to the incoming traffic requests and they can be directed toward different destinations. Alternatively, flows can be co-routed. Transponders supporting slice-ability are also called sliceable bandwidth variable transponders (SBVT). Typically, in the literature, SBVTs have been considered composed of multiple laser sources (i.e., one for each optical flow unit, or sub-carrier). In this paper, we propose a novel cost-effective SBVT architecture based on multi-wavelength source and micro ring resonators (MRRs), supporting super-channel (i.e., an optical connection composed of several co-routed sub-carriers) and slice-ability. A multi-wavelength source is a source able to create several optical sub-carriers from a single laser. Thus, to generate N sub-carriers, N - 1 laser sources can be saved. Then, MRRs are used to select each sub-carrier and direct it to the proper modulator. In this paper, we design and analyze MRR-based filters for sub-carrier selection through simulations. The proposed sliceable transponder also enables multi-rate, multi-modulation format with optical reach adaptation, and time frequency packing (an advanced transmission technique that is an evolution of the faster-than-nyquist). A specific design of a SBVT enabling an information rate of 400 Gb/s is presented considering standard 100 GbE interfaces. The adoption of multi-wavelength is analyzed in terms of constraints in the routing and spectrum assignment (RSA), especially in the case of slice-ability. In particular, multi-wavelength source may create sub-carriers that are contiguous in frequency, thus with possible limitations in the RSA. In this paper, the impact of such constraint is studied through network simulations. Results show that the prop- sed SBVT architecture is able to achieve low blocking and reducing the number of lasers installed in the network.
    Optical Network Design and Modeling, 2014 International Conference on; 05/2014
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    ABSTRACT: We propose and experimentally characterize polarization independent all-optical phase-preserving amplitude regeneration of differential phase shift keying (DPSK) signals exploiting four-wave mixing (FWM) effect in a single semiconductor optical amplifier (SOA) with co-polarized dual-pump architecture. The regenerative capability and the robustness of the system against conversion range is investigated, demonstrating Q-factor and bit error rate (BER) threshold margin improvement with almost steady optical signal-to-noise ratio (OSNR) and FWM conversion efficiency within a range of 6 nm for an NRZ-DPSK 10 Gb/s data signal.
    2014 Fotonica AEIT Italian Conference on Photonics Technologies (Fotonica AEIT); 05/2014
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    ABSTRACT: Wavelength-preserving and wavelength-converting amplitude regeneration of 40 Gb/s DPSK data in a saturated semiconductor optical amplifier (SOA) with limited excess phase noise feature is reported and investigated. By injecting simultaneously in the amplifier the noisy data and a CW beam with proper power levels, both the pass-through (PT) signal and the wavelength-converted data by four-wave-mixing (FWM) can be regenerated. The strongest regenerative effect is observed for the converted FWM data. The effect of input power variations on the regenerative performance of the device is thoroughly investigated in terms of Bit-Error Rate (BER) versus threshold margin improvement. We observe that regenerative behavior is attained for different levels of the data and CW power levels at SOA input. Experimental investigation of small-signal amplitude and phase SOA response reveals indeed the role of data/CW power balance for reducing the impact of excess phase noise from the amplifier. The analysis also confirms the stronger regenerative capability of the FWM process due to the strong amplitude-limiting SOA response at lower input data power in respect to the PT signal. The scheme offers the advantages of simplicity, compactness, and low operating power levels, making it a practical candidate for all-optical regeneration of high-speed DPSK signals.
    Journal of Lightwave Technology 05/2014; 32(10):1966-1972. DOI:10.1109/JLT.2014.2316415 · 2.97 Impact Factor
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    ABSTRACT: A simple and effective technique enabling strong pattern effects mitigation in uplink in-line semiconductor optical amplifiers (SOAs) for reach-extended, high-speed, passive optical networks, is proposed and experimentally demonstrated. The technique relies in selectively injecting into the saturated amplifier a low-power CW assist light (AL) at shorter wavelength than the data signal. The presence of the AL, which is enabled when the power level of input data triggers pattern effects in the SOA, clamps the carrier density with almost negligible gain reduction at the 1.3 $mu{rm m}$ data wavelength. By injection of an AL signal at 1.27 $mu{rm m}$ with 1 mW power in the booster SOA of a two-SOA cascade reach-extender, an increase as large as 7 dB in the access span loss dynamic range for error-free transmission at 10 Gb/s is reported with a trunk span loss of 23 dB.
    IEEE Photonics Technology Letters 01/2014; 26(2):165-168. DOI:10.1109/LPT.2013.2290151 · 2.11 Impact Factor
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    ABSTRACT: A novel architecture to drive phased arrayed antennas modules, based on photonics, is presented. The proposed architecture is capable of independently steer two signals at 12.5 and 37.5GHz, enabling an effective system for antenna remoting.
    Photonics in Switching; 01/2014
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    ABSTRACT: Semiconductor optical amplifier-Mach-Zehnder interferometer (SOA-MZI) is a technologically mature optical device that can be exploited for a wide range of operations on both amplitude and phase modulated signals, with performance limited by the carrier lifetime in the SOAs. Recent advances on SOA structures have demonstrated their suitability for high quality, ultra-fast photonic signal processing, making SOA-MZI a good candidate for elaborating signals in new generation high-capacity optical networks. Dynamic wavelength switching/routing and add/drop operations are expected to bring benefits in future optical networks in terms of improved system flexibility and efficiency. The capability of performing such operations directly in the optical domain can significantly reduce the number of opto/electrical and electro/optical conversions in the routing nodes, reducing their power consumption and their latency time. Moreover, since phase-shift keying (PSK) formats or other advanced modulation formats involving both amplitude and phase modulation, start to coexist in optical communication systems with the conventional on-off keying (OOK) modulation format, the availability of a single device, suitable for processing all these different signals, is mandatory. The SOA-MZI fits all these requirements for both OOK and constant-envelope phase-modulated signals, providing a compact and flexible solution. Here we review on the use of the SOA-MZI for carrying out alloptical switching operations, by realizing wavelength conversion and add/drop functionalities, both for OOK and differential binary phase shift keying (DPSK) signals up to 40 Gb/s. Power penalties lower than 2 dB are demonstrated in all cases.
    Frontiers of Optoelectronics 01/2013; 6(1):67-77. DOI:10.1007/s12200-012-0297-3
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    ABSTRACT: We report wavelength-preserving and wavelength-converting regeneration of 40Gb/s DPSK data in a saturated SOA. Experimental investigation of small-signal SOA amplitude and phase response reveals the role of data/CW power balance for phase preserving operation.
    Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC), 2013; 01/2013
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    ABSTRACT: We propose a novel method for signal processing of phase-modulated signals suitable for 100 G coherent systems. By exploiting a single semiconductor optical amplifier Mach-Zehnder interferometer, all-optical selective switching with simultaneous wavelength conversion of bursts of data in the original signal is demonstrated. The operation is suitable for dynamic wavelength routing and/or add/drop operation in multichannel coherent systems, thus enabling flexible network resources optimization. The operation has been demonstrated for single-channel single-polarization, dual-channel (DC) single-polarization, and DC polarization-multiplexed (PM) 28 GBaud quadrature phase shift key-modulated signals. By exploiting coherent detection strategy and digital signal processing, an error rate below 10-3 prior to forward error correction has been observed for all the experiments; the corresponding optical signal-to-noise ratio penalty has been measured to be almost negligible in the single-polarization case whereas a maximum penalty below 1.5 dB for the PM one is reported.
    Journal of Lightwave Technology 09/2012; 30(18):3010-3016. DOI:10.1109/JLT.2012.2210995 · 2.97 Impact Factor
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    ABSTRACT: We report an extensive experimental wavelength characterization of a scheme for all-optical gated wavelength shifting operation. This scheme is suitable for dynamic wavelength routing and add or drop operation in wavelength-division multiplexing systems and optical packet switched networks. A single semiconductor-optical amplifier Mach–Zehnder interferometer with a multi-inputs configuration is exploited. We demonstrate an error-free operation in the case of 10 Gb/s NRZ-OOK data with moderate power penalties $({<}{rm 1.7}~{rm dB})$ over the entire C-band.
    IEEE Photonics Technology Letters 09/2012; 24(17). DOI:10.1109/LPT.2012.2207885 · 2.11 Impact Factor
  • S Pinna · C Porzi · C Giampiero · A Bogoni ·
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    ABSTRACT: We report broadband operation of an all-optical wavelength shifter, performing simultaneous drop and wavelength-conversion of a burst of OOK data selected by an optical gate. The device operates entirely in the photonic domain and is based on a single Semiconductor Optical Amplifier Mach- Zehnder Interferometer. The circuit is suitable for dynamic wavelength routing and add/drop operation in WDM systems and packet switched networks. Experimental characterization of device operation for different wavelength conversion values of the gated data demonstrates error-free operation at 10 Gb/s with moderate power penalty over the entire C-band.
    Photonic in Switching; 09/2012
  • Claudio Porzi · Giampiero Contestabile · Antonella Bogoni ·
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    ABSTRACT: We demonstrate an all-optical scheme for the simultaneous drop and wavelength conversion of bursts of data from a continuous stream of differential phase-shift keyed (DPSK) signals. This function is obtained in a single semiconductor optical amplifier Mach-Zehnder interferometer thanks to proper nonlinear interaction of the data stream and an optical gate signal at different wavelength. Fast switching-time enabling wavelength shifting operation on continuous DPSK data stream at 10 and 40 Gb/s without any bit loss is reported. Corresponding measured power penalties are negligible at 10 Gb/s and about 1.7 dB at 40 Gb/s.
    Optics Letters 07/2012; 37(13):2523-5. DOI:10.1364/OL.37.002523 · 3.29 Impact Factor
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    ABSTRACT: A monolithically integrated InP optical device performing XOR between a bit sequence and one delayed copy (differential XOR) for encryption, scrambling, PRBS generation, and differential modulation format decoding is presented. Operation at 8/16/32Gbs is reported.
    OFC; 03/2012
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    ABSTRACT: An innovative integrated all-optical device for 100G coherent systems able to simultaneously perform selective data erasing and wavelength conversion from input data is demonstrated. It enables flexible network resource optimization introducing negligible OSNR penalty.
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    ABSTRACT: A self-routing all-optical circuit for 40 Gbit/s DPSK optical packets is presented. The header information is self-processed to eventually drive an all-optical flip-flop, which serves as the optical pump in a coherent wavelength converter. Operation of the circuit is shown and switched optical packets with an overall limited penalty ( 1 dB) are reported.
    Electronics Letters 02/2012; 48(3):169-171. DOI:10.1049/el.2011.3527 · 0.93 Impact Factor
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    ABSTRACT: Simultaneous wavelength conversion and channel drop operation for 112 Gb/s polarization-multiplexed QPSK signals is demonstrated by using a single SOA-MZI controlled by an optical gate signal. After coherent detection, low OSNR penalty is measured.
    Lasers and Electro-Optics (CLEO), 2012 Conference on; 01/2012
  • C. Porzi · G. Contestabile · A. Bogoni ·
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    ABSTRACT: Broadband operation of regenerative wavelength conversion of NRZ DPSK signals by means of four-wave mixing in a semiconductor optical amplifier is reported. Significant Q-factor improvement of the converted data is observed at 10 Gb/s in both down- and up-conversion operation over nearly 50 nm conversion range.
    Photonics in Switching (PS), 2012 International Conference on; 01/2012
  • C. Porzi · G. Contestabile · A. Bogoni ·
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    ABSTRACT: Simultaneous wavelength conversion and data erasing of a burst of DPSK data under an optical gate is demonstrated in a single SOA-MZI. Error-free operation with low power penalty is reported at 10 and 40 Gb/s.
    Optical Fiber Communication Conference and Exposition (OFC/NFOEC), 2012 and the National Fiber Optic Engineers Conference; 01/2012
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    ABSTRACT: We propose and experimentally demonstrate an original scheme for simultaneous all-optical wavelength con- version and data erasing under an optical gate signal, suitable for on-off keying (OOK) signals. This function is obtained in a semiconductor optical amplifier Mach-Zehnder interferometer (SOA-MZI) exploiting nonlinear interaction between a continuous data stream and an optical gate signal at a different wavelength. In correspondence of the gate signal, a burst of data from the optical stream is converted at the optical gate wavelength and, at the same time, cancelled at the input stream wavelength. Fast switching time enabling selective wavelength shifting on a data stream at 10 Gb/s without any bit loss is demonstrated. Error-free operation with 0.2-dB power penalty for the wavelength-preserved output data and 1.8 dB for the shifted data is reported.
    IEEE Photonics Technology Letters 11/2011; 23(21):1621-1623. DOI:10.1109/LPT.2011.2165318 · 2.11 Impact Factor

Publication Stats

230 Citations
48.24 Total Impact Points


  • 2005-2014
    • Scuola Superiore Sant'Anna
      • • Institute of Communication, lnformation and Perception Technologies TECIP
      • • Real-Time Systems Laboratory RETIS lab
      Pisa, Tuscany, Italy
    • Tampere University of Technology
      • Optoelectronics Research Centre
      Tammerfors, Pirkanmaa, Finland
  • 2003-2013
    • Scuola Normale Superiore di Pisa
      Pisa, Tuscany, Italy
  • 2011
    • University of Glasgow
      • Division of Electronics and Electrical Engineering
      Glasgow, Scotland, United Kingdom