Ara es mostren els items 63-82 de 85

    • Quantifying bypass traffic in partially meshed transparent optical networks 

      Comellas Colomé, Jaume; Hario, Fakhriy; Junyent Giralt, Gabriel (Springer Nature, 2023-06-28)
      Article
      Accés obert
      This work investigates the transparent bypassing capacity requirements of elastic backbone optical networks to determine the all-optical cross-connection capacity needed at network nodes. Topological parameters have been ...
    • Quantifying dynamic traffic in elastic optical networks 

      Comellas Colomé, Jaume; Vicario, L.; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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      This work is focused on the characterization of the traffic allocated in Elastic Optical backbone networks when different dynamic traffic profiles are generated. Extensive simulations are done to statistically model the ...
    • Quantitative analysis of dynamic dedicated path protection in Elastic Optical Networks 

      Comellas Colomé, Jaume; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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      A simple scheme to implement dedicated path protection in Elastic Optical Networks is proposed and evaluated under dynamic traffic conditions. It consists in splitting the spectrum available in the network links in two ...
    • Quaternary optical transmission system combining phase and polarization shift keying 

      Comellas Colomé, Jaume; Gené Bernaus, Joan M.; Prat Gomà, Josep Joan (2004-07)
      Article
      Accés obert
      A new optical transmission scheme which combines polarization-shift keying and differential phase-shift keying on the same optical carrier is proposed. Simulations carried out show a considerable tolerance toward different ...
    • Resources optimization in GMPLS-based optical multilayer networks 

      Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo; Spadaro, Salvatore; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (2009-06-09)
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    • Scalable hybrid path computation procedure for PCE-based 

      Hernández Sola, Guillem; Perelló Muntan, Jordi; Agraz Bujan, Fernando; Spadaro, Salvatore; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (2011)
      Text en actes de congrés
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      In the Hierarchical Path Computation Element (H-PCE) architecture, an optimum end-to-end path is computed using a hierarchical relationship among PCEs. An H-PCE-based path computation procedure provides low network ...
    • Scalable hybrid path computation procedure for PCE-based multi-domain WSON networks 

      Hernández Sola, Guillem; Perelló Muntan, Jordi; Agraz Bujan, Fernando; Spadaro, Salvatore; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (IEEE, 2011)
      Text en actes de congrés
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      In the Hierarchical Path Computation Element (H-PCE) architecture, an optimum end-to-end path is computed using a hierarchical relationship among PCEs. An H-PCE-based path computation procedure provides low network blocking ...
    • Service and resource differentiation in shared-path protection environments to maximize network operator's revenues 

      Velasco Esteban, Luis Domingo; Ruiz Ramírez, Marc; Perelló Muntan, Jordi; Spadaro, Salvatore; Comellas Colomé, Jaume (IEEE Press. Institute of Electrical and Electronics Engineers, 2011-02)
      Article
      Accés obert
      Network operators are facing hard competition for opportunities in the telecommunications market, forcing network investments to be carefully evaluated before the decision-making process. A great part of core network operators’ ...
    • Single-path provisioning with multi-path recovery in flexgrid optical networks 

      Castro Casales, Alberto; Velasco Esteban, Luis Domingo; Ruiz Ramírez, Marc; Comellas Colomé, Jaume (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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      The new flexgrid technology, in opposition to the fixed grid one traditionally used in wavelength switched optical networks (WSON), allows allocating the spectral bandwidth needed to convey heterogeneous client demand ...
    • Soft failure localization during commissioning testing and lightpath operation 

      Pérez Vela, Alba; Shariati, Mohammad Behnam; Ruiz Ramírez, Marc; Cugini, Filippo; Castro Casales, Alberto; Lu, Hongbo; Proietti, Roberto; Comellas Colomé, Jaume; Castoldi, Piero; Yoo, Sung-Joo Ben; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2017-11-09)
      Article
      Accés obert
      In elastic optical networks (EONs), effective soft failure localization is of paramount importance to early detection of service level agreement violations while anticipating possible hard failure events. So far, failure ...
    • Soft failure localization in elastic optical networks 

      Vela, A.P.; Shariati, Mohammad Behnam; Ruiz Ramírez, Marc; Comellas Colomé, Jaume; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
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      Soft failure localization to early detect service level agreement violations is of paramount importance in elastic optical networks (EONs), while it allows anticipating possible hard failure events. Nowadays, effective and ...
    • Some open issues in multi-domain/multi-operator/multi-granular ASON/GMPLS networks 

      Spadaro, Salvatore; Velasco Esteban, Luis Domingo; Perelló Muntan, Jordi; Agraz Bujan, Fernando; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (IEEE, 2009-07-31)
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      Large optical backbone networks may be composed of several domains, each one controlled by different administrators/operators. Besides, the bandwidth granularity of these domains may be different. Label Switched Paths ...
    • Spatial partitioning for proactive spectrum fragmentation avoidance in flex-grid/SDM dynamic optical core networks 

      Comellas Colomé, Jaume; Perelló Muntan, Jordi; Solé Pareta, Josep; Junyent Giralt, Gabriel (2020-10)
      Article
      Accés obert
      Spectrum fragmentation has always been a major issue to overcome toward spectrally efficient Flex-Grid over Single-Mode Fiber dynamic optical networks and continues like so when evolving to Flex-Grid over Spatial Division ...
    • Spectrally and spatially flexible optical networks: recent developments and findings 

      Shariati, Mohammad Behnam; Klonidis, Dimitrios; Marom, Dan M.; Comellas Colomé, Jaume; Velasco Esteban, Luis Domingo; Tomkos, Ioannis (Institute of Electrical and Electronics Engineers (IEEE), 2018-09-27)
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      Space division multiplexing (SDM) has been proposed as the ultimate solution to address the capacity crunch of optical transport networks. The efficient utilization of SDM requires some forms of spatial integration which ...
    • SSMS: A split step multiband simulation software 

      Khare, Prasunika; Costa, Nelson; Pedro, João; Napoli, Antonio; Arpanaei, Farhad; Comellas Colomé, Jaume; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2023)
      Text en actes de congrés
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      We introduce SSMS, a multiband optical fiber simulator entirely developed in MATLAB. SSMS solves the generalized nonlinear Schrödinger equation relying on the 4 th order Runge-Kutta method in Interaction Picture (RK4IP) ...
    • Supporting heterogenous traffic on top of point-to-multipoint light-trees † 

      Iqbal, Masab; Velasco Esteban, Luis Domingo; Ruiz Ramírez, Marc; Costa, Nelson; Napoli, Antonio; Pedro, João; Comellas Colomé, Jaume (2023-02-23)
      Article
      Accés obert
      New 5 G and beyond services demand innovative solutions in optical transport to increase efficiency and flexibility and reduce capital (CAPEX) and operational (OPEX) expenditures to support heterogeneous and dynamic traffic. ...
    • Técnicas para minimizar la degradación provocada por la polarización en las comunicaciones por fibra óptica 

      Comellas Colomé, Jaume (Universitat Politècnica de Catalunya, 1999-07-16)
      Tesi
      Accés obert
      En els últims anys la importància de la polarització en les comunicacions òptiques ha crescut notablement com resultat de tres grans desenvolupaments:<br/>1. L'aparició de l'amplificació òptica ha fet que es produeixi un ...
    • Three years of an intensive programme: experiences, observations and learning points 

      Myrup Pedersen, Jens; Gutiérrez López, José Manuel; Kirikova, Marite; Zabludowski, Lukasz; Comellas Colomé, Jaume (Aalborg University Press, 2015)
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      This paper summarizes valuable experiences and learning points from three years of the Erasmus funded Intensive Programme on “Implementing Europe’s Future Broadband Infrastructure”. The programme consisted of a course held ...
    • Using dual-path allocation for partial traffic protection in elastic optical networks 

      Junyent Giralt, Gabriel; Comellas Colomé, Jaume (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Multi-path allocation has been proposed as a simple way to achieve traffic protection in different networking domains. In this work dual-path allocation is proposed for Elastic Optical Networks (EON) assuming dynamic offered ...
    • Using spatial division multiplexing to avoid fragmentation in flex-grid optical networks 

      Comellas Colomé, Jaume; Perelló Muntan, Jordi; Solé Pareta, Josep; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Text en actes de congrés
      Accés obert
      Spectrum fragmentation is one of the main drawbacks of Flex-Grid Optical Networks, and it becomes especially harmful under dynamic traffic conditions. When evolving from single fibre networks to spatial division multiplexed ...