Now showing items 1-20 of 25

    • A service-oriented hybrid access network and clouds architecture 

      Velasco Esteban, Luis Domingo; Contreras, Luis Miguel; Ferraris, Giuseppe; Stavdas, Alexandros; Cugini, Filippo; Wiegand, Manfred; Fernández Palacios, Juan Pedro (2015-04-01)
      Article
      Open Access
      Many telecom operators are deploying their own cloud infrastructure with the two-fold objective of providing cloud services to their customers and enabling network function virtualization. In this article we present an ...
    • Active PCE demonstration performing elastic operations and hitless defragmentation in flexible grid optical networks 

      Paolucci, Francesco; Castro Casales, Alberto; Fresi, Francesco; Imran, Muhammad; Giorgetti, Alessio; Bhownik, Bishanka Brata; Berrettini, Gianluca; Meloni, Gianluca; Cugini, Filippo; Velasco Esteban, Luis Domingo; Poti, Luca; Castoldi, Piero (2015-02-01)
      Article
      Restricted access - publisher's policy
    • An architecture to support autonomic slice networking 

      Velasco Esteban, Luis Domingo; Gifre Renom, Lluís; Izquierdo Zaragoza, José Luis; Paolucci, Francesco; Vela, Alba P.; Sgambelluri, Andrea; Ruiz Ramírez, Marc; Cugini, Filippo (2017-09-01)
      Article
      Open Access
      IEEE Network slices combine resource virtualization with the isolation level required by future 5G applications. In addition, the use of monitoring and data analytics help to maintain the required network performance, while ...
    • BER degradation detection and failure identification in elastic optical networks 

      Vela, Alba P.; Ruiz Ramírez, Marc; Fresi, Francesco; Sambo, Nicola; Cugini, Filippo; Meloni, Gianluca; Poti, Luca; Velasco Esteban, Luis Domingo; Castoldi, Piero (2017-08-30)
      Article
      Open Access
      IEEE Optical connections support virtual links in MPLS-over-optical multilayer networks and therefore, errors in the optical layer impact on the quality of the services deployed on such networks. Monitoring the performance ...
    • Combining a machine learning and optimization for early pre-FEC BER degradation to meet committed QoS 

      Pérez Vela, Alba; Ruiz Ramírez, Marc; Cugini, Filippo; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference report
      Restricted access - publisher's policy
      Monitoring the physical layer is key to detect bit error rate (BER) degradation caused by failures and to identify the cause of the failure and localize the failed elements. Once the failure has been detected, actions can ...
    • Dedicated protection with signal overlap in elastic optical networks 

      Cugini, Filippo; Ruiz Ramírez, Marc; Foggi, Tommaso; Velasco Esteban, Luis Domingo; Sambo, Nicola; Castoldi, Piero (Institute of Electrical and Electronics Engineers (IEEE), 2017-11-15)
      Article
      Restricted access - publisher's policy
      In optical dedicated path protection (1 1), the same optical signal is transmitted along both working and backup paths. Thus, in 1 1, the transmission parameters need to be configured according to the most impaired path, ...
    • Dynamic core VNT adaptability based on predictive metro-flow traffic models 

      Morales Alcaide, Fernando; Gifre Renom, Lluís; Paolucci, Francesco; Ruiz Ramírez, Marc; Cugini, Filippo; Castoldi, Piero; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2017-12-01)
      Article
      Open Access
      MPLS-over-optical virtual network topologies (VNTs) can be adapted to near-future traffic matrices based on predictive models that are estimated by applying data analytics on monitored origin-destination (OD) traffic. ...
    • Early pre-FEC BER degradation detection to meet committed QoS 

      Pérez Vela, Alba; Ruiz Ramírez, Marc; Fresi, Francesco; Sambo, Nicola; Cugini, Filippo; Velasco Esteban, Luis Domingo; Castoldi, Piero (Optical Society of American (OSA), 2017)
      Conference report
      Restricted access - publisher's policy
      Early optical layer BER degradation detection is proposed to trigger affected demands re-routing, targeting at reducing SLA violation. Results show that the proposed detection and re-routing algorithms noticeably reduce ...
    • Experimental assessment of ABNO-driven multicast connectivity in flexgrid networks 

      Gifre Renom, Lluís; Paolucci, Francesco; Gonzalez de Dios, Oscar; Velasco Esteban, Luis Domingo; Contreras, Luis Miguel; Cugini, Filippo; Castoldi, Piero; López Álvarez, Victor (2015-01-14)
      Article
      Open Access
      The increasing demand of internet services is pushing cloud services providers to increase the capacity of their data centers (DC) and create DC federations, where two or more cloud providers interconnect their infrastructures. ...
    • Experimental assessment of in-operation spectrum defragmentation 

      Gifre Renom, Lluís; Paolucci, Francesco; Aguado, Alejandro; Casellas Regi, Ramón; Castro Casales, Alberto; Cugini, Filippo; Castoldi, Piero; Velasco Esteban, Luis Domingo; López Grimau, Víctor (2014-06-01)
      Article
      Restricted access - publisher's policy
      Dynamic operation of flexgrid networks might cause optical spectrum to be divided into fragments, which makes it difficult finding contiguous spectrum of the required width for incoming connection requests, leading thus ...
    • Experimental demonstration of an active stateful PCE performing elastic operations and hitless defragmentation 

      Castro Casales, Alberto; Paolucci, Francesco; Fresi, Francesco; Imran, Muhammad; Bhowmik, Bishanka; Berrettini, Gianluca; Meloni, Gianluca; Giorgetti, Alessio; Cugini, Filippo; Velasco Esteban, Luis Domingo; Poti, Luca; Castoldi, Piero (2013)
      Conference report
      Restricted access - publisher's policy
      An experimental demonstration of active stateful PCE for flexgrid networks is presented. The PCE enables elastic operations on established connections and, when required, performs hitless defragmentation of spectrum ...
    • Filter optimization in SDN-based flexgrid networks 

      Paolucci, Francesco; Fresi, Francesco; Castro Casales, Alberto; Velasco Esteban, Luis Domingo; Cugini, Filippo; Sambo, Nicola; Giorgetti, Alessio; Poti, Luca; Castoldi, Piero (Optical Society of American (OSA), 2014)
      Conference report
      Restricted access - publisher's policy
      The novel super-filter technique for flexgrid optical networks is proposed to compact spectrum-contiguous lightpaths. The technique is applied in a specifically extended SDN architecture, showing significant gains in terms ...
    • First experimental assessment of ABNO-driven in-operation flexgrid network re-optimization 

      Gifre Renom, Lluís; Paolucci, Francesco; Velasco Esteban, Luis Domingo; Aguado, Alejandro; Cugini, Filippo; Castoldi, Piero; López Álvarez, Victor (2015-02-01)
      Article
      Open Access
      Traffic affected by link failures can be recovered using path restoration schemes. In dynamically operated networks provided with a control plane, restoration algorithms run in a centralized element, such as the path ...
    • First experimental demonstration of ABNO-driven in-operation flexgrid network re-optimization 

      Velasco Esteban, Luis Domingo; Paolucci, Francesco; Gifre Renom, Lluís; Aguado, Alejandro; Cugini, Filippo; Castoldi, Piero; López, Víctor (The Optical Society (OSA), 2014)
      Conference report
      Open Access
      The after failure repair optimization problem is used to experimentally validate in-operation planning using the ABNO architecture to control a flexgrid optical network. A back-end PCE is used to solve this computational ...
    • Fully disaggregated ROADM white box with NETCONF/YANG control, telemetry, and machine learning-based monitoring 

      Sgambelluri, Andrea; Izquierdo Zaragoza, José Luis; Giorgetti, Alessio; Gifre Renom, Lluís; Velasco Esteban, Luis Domingo; Paolucci, Francesco; Sambo, Nicola; Fresi, Francesco; Castoldi, Piero; Morro, Roberto; Riccardi, Emilio; D'Errico, Alessio; Cugini, Filippo (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Conference report
      Restricted access - publisher's policy
      A first demonstration of ROADM White Box augmented with machine learning capabilities is demonstrated. The white box includes various level of disaggregation, NETCONF/YANG control, telemetry and spectrum-based advanced ...
    • Multipath restoration and bitrate squeezing in SDN-based elastic optical networks [Invited] 

      Paolucci, Francesco; Castro Casales, Alberto; Cugini, Filippo; Velasco Esteban, Luis Domingo; Castoldi, Piero (2014-08-01)
      Article
      Restricted access - publisher's policy
      Sliceable bandwidth-variable transponders (SBVTs) enable the adaptation of transmission parameters according to traffic requirements and network constraints. In this study, SBVTs capabilities are evaluated in the context ...
    • On the benefits of differentiating the filter configurations in flexi-grid optical networks 

      Castro Casales, Alberto; Cugini, Filippo; Velasco Esteban, Luis Domingo; Castoldi, Piero (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      An effective strategy exploiting differentiated filter configurations in flexi-grid optical networks is proposed and evaluated. Results show that 15% throughput improvements can be achieved with respect to traditional ...
    • On the benefits of elastic spectrum management in multi-hour filterless metro networks 

      Pedreno Manresa, J.J.; Izquierdo Zaragoza, José Luis; Cugini, Filippo; Pavón Mariño, Pablo (Institute of Electrical and Electronics Engineers (IEEE), 2018-06-28)
      Conference report
      Restricted access - publisher's policy
      The dawn of 5G is pushing operators to deploy high-capacity, agile networks capable of adapting to time-varying traffic patterns, especially into metro sections. ROADMs are key enablers for agility in the optical layer, ...
    • Optical signal tracking for robust PAM4 deployment in filterless metro network scenarios 

      Shariati, Mohammad Behnam; Fresi, Francesco; Ruiz Ramírez, Marc; Cugini, Filippo; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Conference report
      Open Access
      Highly accurate and reliable optical signal tracking is proposed that estimates sub-GHz laser drift failures by analyzing spectra acquired by cost-effective coarse-granular OSAs. Its application on PAM4 systems in filterless ...
    • REACTION: Research and experimental assessment of control plane architectures for in-operation flexgrid network re-optimization 

      Cugini, Filippo; Velasco Esteban, Luis Domingo; Gifre Renom, Lluís; Dallaglio, Mateo; López Álvarez, Victor; Fernández Palacios, Juan Pedro (2015)
      External research report
      Open Access
      The REACTION project proposes, designs, and validates flexi-grid elastic optical networks enabling software-controlled high-rate transmissions. In this paper, the main project objectives are reported, together with a brief ...