Ara es mostren els items 32-51 de 85

    • Impact of aggregation level on the performance of dynamic lightpath adaptation under time-varying traffic 

      Asensio Carmona, Adrian; Klinkowski, Miroslaw; Ruiz Ramírez, Marc; Lopez, Victor Bohorquez; Castro Casales, Alberto; Velasco Esteban, Luis Domingo; Comellas Colomé, Jaume (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      In this article we focus on lightpath adaptation under time-varying traffic in a dynamic elastic optical network (EON) implementing flexgrid optical technology. In the considered scenario, a number of IP/MPLS metro area ...
    • Impact of filter sharpness on the performance of elastic optical networks 

      Sayyad Kodashenas, Pouria; Rivas Moscoso, José Manuel; Klonidis, Dimitrios; Tomkos, Ioannis; Shariati, Mohammad Behnam; Comellas Colomé, Jaume (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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      Elastic optical network (EON) technology arises as a promising solution for future high-speed optical transport networks, inasmuch as it can provide superior flexibility and scalability in the spectrum allocation for ...
    • Impact of optical hop constraints on the IP/MPLS-over-WSON Networks CAPEX 

      Liu, Fengqing; Comellas Colomé, Jaume (2015-11-01)
      Article
      Accés obert
      In this work, the impact of hop constraints on the CAPEX of multi-layer IP/MPLS over WSON networks is evaluated under different scenarios. By routing lightpaths with different number of transparent hops, the cost of networks ...
    • Impact of traffic delay tolerance on elastic optical networks performance 

      Comellas Colomé, Jaume; Nourmohammadi, Farzaneh; Junyent Giralt, Gabriel (2020)
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      Elastic Optical Networks (EON) are considered as a valuable solution to enhance optical networks efficiency due to their superior network spectrum use. By breaking the traditional fixed grid of WDM networks, the spectrum ...
    • Improving link spectrum utilization in Flexgrid optical networks 

      Comellas Colomé, Jaume; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2015-07-01)
      Article
      Accés obert
      Flexible grid optical networks are emerging as an appealing solution for future high-speed optical transport because they can provide superior flexibility and scalability and cope with the rapid growth of Internet traffic. ...
    • Learning from the optical spectrum: failure detection and identification [Invited] 

      Shariati, Mohammad Behnam; Ruiz Ramírez, Marc; Comellas Colomé, Jaume; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2018-07-23)
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      Accés obert
      The availability of coarse-resolution cost-effective Optical Spectrum Analyzers (OSA) allows its widespread deployment in operators’ networks. In this paper, we explore several machine learning approaches for soft-failure ...
    • Learning from the optical spectrum: soft-failure identification and localization 

      Velasco Esteban, Luis Domingo; Shariati, Mohammad Behnam; Vela, Alba P.; Comellas Colomé, Jaume; Ruiz Calvo, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      The availability of coarse-resolution cost-effective Optical Spectrum Analyzers (OSA) allows its widespread deployment in operators' networks. In this paper, several machine learning approaches for failure identification ...
    • Man-in-the-middle attacks through re-shaping I-Q optical constellations 

      Ruiz Ramírez, Marc; Comellas Colomé, Jaume; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2023)
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      A module to re-shape optical constellations making the optical signal resembles as it has traversed some distance is presented. Armed with this module, Main-in-the-Middle attacks can be performed, which could be undetectable ...
    • Minimum channel spacing in an ofdm cpfsk optical coherent system 

      Prat Gomà, Josep Joan; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (1998-03)
      Article
      Accés restringit per política de l'editorial
      Channel spacing in optical frequency-division multiplexed (OFDM) coherent optical systems with continuous-phase frequency-shift-keying (CPFSK) is obtained both theoretically and experimentally. The bit error ratio is derived ...
    • Mixed integration of CDIO skills into telecommunication engineering curricula 

      Sayrol Clols, Elisa; 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.; Pla, Enrique; Prat Viñas, Lluís; Sáez Moreno, Germán; Sardà Ferrer, Joan; Tallon Montoro, Carme (2010)
      Article
      Accés obert
      Spain has been intensively involved in designing engineering curricula for the last two years and next academic year all engineering schools will be deploying all bachelor programs adapted to the EHEA and to the Spanish ...
    • ML-aided SOP compensation to increase key exchange rate in QKD systems 

      Ahmadian, Seyed Morteza; Ruiz Ramírez, Marc; Comellas Colomé, Jaume; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2023)
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      Secure communications have become a requirement for virtually all kind of applications. Currently, two distant parties can generate shared random secret keys by using public key cryptography. However, quantum computing ...
    • Modeling the routing and spectrum allocation problem for flexgrid optical networks 

      Velasco Esteban, Luis Domingo; Klinkowski, Miroslaw; Ruiz Ramírez, Marc; Comellas Colomé, Jaume (2012-12)
      Article
      Accés restringit per política de l'editorial
      Flexgrid optical networks are attracting huge interest due to their higher spectrum efficiency and flexibility in comparison with traditional wavelength switched optical networks based on the wavelength division multiplexing ...
    • Modified duobinary polarization-shift keying transmission scheme 

      Gené Bernaus, Joan M.; Soler Rocasalbas, Marçal; Contreras Leyva, Miguel A.; Comellas Colomé, Jaume; Prat Gomà, Josep Joan (2003)
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      A new version of duobinary polarization-shift keying scheme is proposed. The relocation of the duobinary filter at the receiver side and the optimization of both transmitter and receiver electrical filters offer a receiver ...
    • Motivations and outcomes: a study of an intensive international course 

      Myrup Pedersen, Jens; Gutiérrez López, José Manuel; Kirikova, Marite; Zabludowski, Lukasz; Comellas Colomé, Jaume (Tempus Publications, 2017-05-10)
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      Accés restringit per política de l'editorial
      In this paper, we study what motivates students and university teachers to do intensive international courses, and how they evaluate the outcomes. The study is based on three years of an Erasmus funded Intensive Programme ...
    • NORMA: Network Operator Revenues Maximization 

      Velasco Esteban, Luis Domingo; Ruiz Ramírez, Marc; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (IEEE, 2012)
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      A great part of core network operators’ gross profit comes from the provisioned connectivity services. In this work, we analyze the provisioning of differentiated services in current Shared Path Protection (SPP) environments. ...
    • 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)
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      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)
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      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)
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      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)
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      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 ...