Ara es mostren els items 47-66 de 85

    • On the benefits of FMF based data center interconnection utilizing MIMO-less PAM-M transceivers 

      Shariati, Mohammad Behnam; Diamantopoulos, Nikolaos-Panteleimon; Klonidis, Dimitrios; Comellas Colomé, Jaume; Tomkos, Ioannis (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      Space division multiplexing (SDM) has been proposed to cost-effectively increase the capacity of optical transmission systems. The cost savings can be realized by introducing some levels of spatial integration of elements. ...
    • On the benefits of multi-path recovery in flexgrid optical networks 

      Castro Casales, Alberto; Velasco Esteban, Luis Domingo; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (2014-12-01)
      Article
      Accés restringit per política de l'editorial
      We propose a new recovery scheme, called multi-path recovery (MPR), specifically designed for flexgrid-based optical networks. It combines protection and restoration schemes to jointly recover, in part or totally, the ...
    • On the performance of dynamic source aggregation of sub-wavelength connections in EONs 

      Sayyad Khodashenas, Pouria; Comellas Colomé, Jaume; Perelló Muntan, Jordi; Spadaro, Salvatore; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In elastic optical networks, heterogeneous traffic demands are typically supported by a single type of bandwidth-variable transmitters, which is not always spectrum and cost efficient. In light of this, we recently proposed ...
    • On the performance of flexgrid-based optical networks 

      Velasco Esteban, Luis Domingo; Ruiz Ramírez, Marc; Pedrola Escribà, Òscar; Castro Casales, Alberto; Klinkowski, Miroslaw; Careglio, Davide; Comellas Colomé, Jaume (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The ever increasing IP traffic volume has finally brought to light the high inefficiency of current wavelength-routed rigid-grid networks in matching the client layer requirements. Such an issue results in the deployment ...
    • Optical interconnection for datacenters: To switch or not to switch 

      Comellas Colomé, Jaume; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2023)
      Text en actes de congrés
      Accés obert
      Optical interconnection is seen as a promising solution to alleviate the congestion problems inside datacenters. Previously reported studies focus solely on optical circuit switching to establish connections. In this work ...
    • Optical network net present value optimization in shared path protection environments 

      Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (IEEE Press. Institute of Electrical and Electronics Engineers, 2011)
      Text en actes de congrés
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      Network operators are facing hard competition for opportunities in the telecommunications market, thus network investments must be carefully evaluated from the costs and revenues viewpoint before the decision making ...
    • Optimized traffic profile for FlexGrid optical networks 

      Liu, Fengqing; Comellas Colomé, Jaume (2017-05-05)
      Article
      Accés obert
      This work is focused on studying the connections’ bandwidth distribution effects on the FlexGrid network performance. An accurate study of spectrum occupancy in heavy loaded FlexGrid optical networks is carried out. This ...
    • Optimizing link spectrum occupancy in elastic optical networks 

      Comellas Colomé, Jaume; Ruiz Ramírez, Marc; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This work focuses on spectrum assignment in Elastic Optical Networks. The accurate study about spectrum occupancy in a flexgrid link is carried out. As a result, the probability values of finding different connection sizes ...
    • Options for cost-effective capacity upgrades in backbone optical networks 

      Shariati, Mohammad Behnam; Rivas Moscoso, José Manuel; Klonidis, Dimitrios; Tomkos, Ioannis; Ben Ezra, Shalva; Jiménez, Felipe; Marom, Dan M.; Sayyad Khodashenas, Pouria; Comellas Colomé, Jaume; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Upgrading the capacity of backbone optical networks while delivering contents to the end-users with a reduced cost per bit is a day-by-day challenge of network operators. In this paper, we first discuss several mid-term ...
    • Path-based recovery in flexgrid optical networks 

      Castro Casales, Alberto; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo; Junyent Giralt, Gabriel; Comellas Colomé, Jaume (IEEE, 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      With the advent of flexgrid optical networks, the rigid wavelength-division multiplexing (WDM) technology will be enhanced by providing better spectrum efficiency and flexibility. In those future flexible optical networks, ...
    • Performance evaluation of a hybrid OBS/OCS network with QoS differentiation based on packet loss/delay requirements 

      Perelló Muntan, Jordi; Guinea, Nuria de; Spadaro, Salvatore; Junyent Giralt, Gabriel; Comellas Colomé, Jaume (2010)
      Text en actes de congrés
      Accés obert
      This paper introduces and evaluates a hybrid OBS/OCS switch for Quality of Service (QoS) differentiation in next-generation all-optical transport networks. Depending on their QoS requirements, incoming IP packets are ...
    • Performance monitor for all-optical networks based on homodyne spectroscopy 

      Amrani, A.; Junyent Giralt, Gabriel; Prat Gomà, Josep Joan; Comellas Colomé, Jaume; Ramdani, I.; Sales Zaragozá, Vicente; Rafel, A. (2000-11)
      Article
      Accés obert
      The ability to transparently detect performance degradations in all-optical networks is highly desirable. We present an optical signal monitor, based on a frequency supervision system, which can participate in some tasks ...
    • Periodic defragmentation in elastic optical networks 

      Comellas Colomé, Jaume; Vicario, L.; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
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      The main weakness of Elastic Optical Networks (EON) stems from spectrum fragmentation. An analysis of periodic defragmentation in EONs under dynamic traffic conditions is carried out. The effects of different defragmentation ...
    • PILOT: A methodology for modeling the performance of packet connections 

      Comellas Colomé, Jaume; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2023)
      Text en actes de congrés
      Accés obert
      Network Services automation requires predictable Quality of Service (QoS) performance, measured in terms of throughput, delay and jitter, to allow making proactive decisions. QoS is typically guaranteed by overprovisioning ...
    • Proactive defragmentation in elastic optical networks under dynamic load conditions 

      Comellas Colomé, Jaume; Vicario, L.; Junyent Giralt, Gabriel (2018-04-13)
      Article
      Accés obert
      The main weakness of elastic optical networks (EON), under dynamic traffic conditions, stems from spectrum fragmentation. A lot of research efforts have been dedicated during recent years to spectrum defragmentation. In ...
    • Proceso de inversión de competencias genéricas en los nuevos planes de estudios de grado de la ETSETB de acuerdo con el modelo CDIO 

      Sayrol Clols, Elisa; Sardà Ferrer, Joan; Sáez Moreno, Germán; Bragós Bardia, Ramon; Alarcón Cot, Eduardo José; Cabrera-Bean, Margarita; Calveras Augé, Anna M.; Comellas Colomé, Jaume; O'Callaghan Castellà, Juan Manuel; Pegueroles Vallés, Josep R.; Prat Viñas, Lluís (2010)
      Text en actes de congrés
      Accés obert
      Los distintos marcos normativos que fijan las condiciones de contorno en la elaboración de los nuevos planes de estudios ponen especial énfasis en el aprendizaje basado en competencias y en la inclusión de determinadas ...
    • 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)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      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)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      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 ...