Enviaments recents

  • All-Optical Intra-PON Data Routing Between ONUs with a MG-Y Tunable Laser as 2.5 Gbps Burst-Mode Transmitter 

    Bonada Bó, Francesc Xavier; Schrenk, Bernhard; Fabrega Sanchez, Josep Maria; Lázaro Villa, José Antonio; Forzati, Marco; Jean Rigole,, Pierre; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2011)
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    Direct communication between ONUs is experimentally demonstrated with a tunable MG-Y laser in a ring+tree PON for 640 users, without passing electrically powered equipment.
  • FSK plus ASK/ASK operation for optical 20/10 gbps access networks with simple reflective user terminals 

    Schrenk, Bernhard; de Valicourt, Guilhem; Lázaro Villa, José Antonio; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2011)
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    Doubling of the downstream rate by reusing the reflective upstream modulator is demonstrated. With just two photo-detectors, a RSOA and a power splitter at the ONU, a 20/10 Gbps mode can be provided per wavelength.
  • Bringing data analytics to the network nodes 

    Pérez Vela, Alba; Via Baraldés, Anna; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (VDE-Verlag, 2016)
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    Monitoring every 15 minutes imposes long traffic anomaly detection times and thus, the monitoring frequency needs to be increased to reduce those times, which entails large amount of monitoring data collected. Consequently, ...
  • Reducing virtual network reconfiguration and traffic losses under multiple traffic anomalies 

    Pérez Vela, Alba; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Optical Society of American (OSA), 2016)
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    Multiple OD traffic anomalies can arise exceeding pre-planned capacity and causing congestion. We propose to detect anomalous and suspicious ODs to reduce virtual network reconfiguration and total traffic losses. Results ...
  • Flexible coherent UDWDM-PON adapting dynamically to different bandwidths 

    Segarra Mullerat, Josep; Sales Zaragoza, Vicente; Prat Gomà, Josep Joan; Kazovsky, Leonid (2017)
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    Ultra-Dense Wavelength Division Multiplexing (UDWDM) is a candidate for future Passive Optical Networks (PONs) to sustain the increase of access traffic, providing enhanced capacity with point-to-point logical connections ...
  • Dimensioning OLT architectures for UDWDM-PONs employing coherent transceivers 

    Segarra Mullerat, Josep; Sales Zaragoza, Vicente; Polo Querol, Víctor; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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    Ultra-Dense Wavelength Division Multiplexing (UDWDM) is a new method for access PON, introducing the wavelength-to-the-user concept. The main technology will be a cost-effective coherent detection scheme providing low-cost ...
  • Using static connections to improve elastic optical networks performance 

    Comellas Colomé, Jaume; Vicario, L.; Junyent Giralt, Gabriel (Optical Society of American (OSA), 2017)
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    Network resources are poorly used in Elastic Optical Networks under dynamic traffic conditions. A hybrid scheme where some resources are statically allocated and the remaining ones are devoted to dynamic traffic, is proposed ...
  • An improved dynamic wavelength assignment in statistical UDWDM-PONs 

    Sales Zaragoza, Vicente; Segarra Mullerat, Josep; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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    Dynamic wavelength assignment (DWA) is investigated for managing ultra-dense wavelength division multiplexing-passive optical networks (UDWDM-PONs). The optical network units (ONUs) own lasers under limited thermal tunability ...
  • Experimental assessment of big data-backed video distribution in the telecom cloud 

    Gifre, Lluis; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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    The telecom infrastructure is undergoing a huge transformation since operators are deploying their own cloud infrastructure to provide cloud services and enabling Network Functions Virtualization (NFV). The resulting ...
  • Adapting the virtual network topology to near future traffic 

    Morales Alcaide, Fernando; Festa, Paola; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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    The introduction of new services requiring large and dynamic bitrate connectivity can cause changes in the direction of the traffic in metro and even core network segments along the day. This leads to large overprovisioning ...
  • Data analytics based origin-destination core traffic modelling 

    Morales Alcaide, Fernando; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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    Traffic monitoring is an essential task for network operators since it allows evaluating network performance. Monitoring data from origin-destination (OD) traffic in core virtual network topologies can be collected from ...
  • Combining 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)
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    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 ...

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