Ara es mostren els items 1-20 de 85

    • A column generation approach for large-scale RSA-based network planning 

      Ruiz Ramírez, Marc; Zotkiewicz, Mateusz; Velasco Esteban, Luis Domingo; Comellas Colomé, Jaume (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In flexgrid-based optical networks, the problem of finding optimal route and spectrum allocation (RSA) for the demands in a traffic matrix becomes harder to solve than similar problems in fixed DWDM networks, mainly due ...
    • A feedback-based hybrid OBS/OCS architecture with fast-over-slow capability 

      Khodashenas, Pooria Saiyad; Perelló Muntan, Jordi; Spadaro, Salvatore; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (2011)
      Comunicació de congrés
      Accés obert
      Dynamic bandwidth allocation in response to the bandwidth requirements of new emerging applications is an essential demand for future optical networks. Hybrid switching architectures combining the benefits of different ...
    • A GRASP with path-relinking heuristic for the survivable IP/MPLS-over-WSON multi-layer network optimization problem 

      Pedrola Escribà, Òscar; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo; Careglio, Davide; González de Dios, Óscar; Comellas Colomé, Jaume (2013-12)
      Article
      Accés restringit per política de l'editorial
      In this paper we deal with the survivable internet protocol (IP)/multi-protocol label switching (MPLS)-over-wavelength switched optical network (WSON) multi-layer network optimization problem (SIMNO). This problem entails ...
    • A GRASP-based heuristic to design the GMPLS control plane network topology with resilience guarantees 

      Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo; Junyent Giralt, Gabriel; Comellas Colomé, Jaume (IEEE Press. Institute of Electrical and Electronics Engineers, 2008)
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      The control plane topology has traditionally followed that of the data plane and therefore the design of the former, as well as its resilience, has been addressed in the latter's one. Owing to the fact that a clear separation ...
    • A simple strategy to improve spectrum use in multi-rate flexgrid optical networks 

      Comellas Colomé, Jaume; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Text en actes de congrés
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      A simple overprovisioning Spectrum Assignment strategy for flexgrid networks is demonstrated as efficient in terms of network throughput at a given blocking probability. Gain is obtained despite allocated spectrum exceeds ...
    • A traffic intensity model for flexgrid optical network planning under dynamic traffic operation 

      Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
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      We obtain a model to estimate the highest traffic intensity that a flexgrid-based network can support in dynamic scenarios. A design problem is introduced to illustrate its application. Numerical results validate both ...
    • Allocating multi-rate requests to single-rate lightpaths in Flexgrid optical networks 

      Comellas Colomé, Jaume; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      Some ideas about the effect of appropriately selecting the size of the connections conveyed by multi-rate flexgrid optical networks are discussed. The main focus is on illustrating the relation between spectrum consumption ...
    • An analytical model for GMPLS control plane resilience quantification 

      Ruiz, M; Perelló Muntan, Jordi; Velasco Esteban, Luis Domingo; Spadaro, Salvatore; Comellas Colomé, Jaume (2009-12)
      Article
      Accés obert
      This paper concentrates on the resilience of the Generalized Multi-Protocol Label Switching (GMPLS) enabled control plane. To this end, the problem of control plane resilience in GMPLS-controlled networks is firstly stated ...
    • An elastic networks OMNeT++-based simulator 

      Asensio Garcia, Adrian; Castro Casales, Alberto; Velasco Esteban, Luis Domingo; Comellas Colomé, Jaume (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      An increasing number of studies about flexgrid-based elastic optical networks are currently being carried out by industry as well as academic research teams. As access to real test-beds is limited, there is a lack of ...
    • An experimental GMPLS-controlled network test-bed enabling sub-wavelength connection provisioning 

      Agraz Bujan, Fernando; Velasco Esteban, Luis Domingo; Perelló Muntan, Jordi; Ruiz Ramírez, Marc; Spadaro, Salvatore; Junyent Giralt, Gabriel; Comellas Colomé, Jaume (IEEE Press. Institute of Electrical and Electronics Engineers, 2009-06-28)
      Text en actes de congrés
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      The efficient accommodation of sub-wavelength client flows on optical channels is a current challenge for resources use optimization in GMPLS controlled optical networks. While optical channels capacity usually exceeds 10 ...
    • Analysis of traffic engineering information dissemination strategies in PCE-based multi-domain optical networks 

      Spadaro, Salvatore; Perelló Muntan, Jordi; Hernández Sola, Guillem; Moreno, A.; Agraz Bujan, Fernando; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (IEEE Computer Society Publications, 2010)
      Text en actes de congrés
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      This paper presents and compares different TE information dissemination strategies between Path Computation Elements (PCEs) in multi-domain optical networks. In such network context, recent studies have found that ...
    • Burst contention avoidance schemes in hybrid GMPLS-enabled OBS/OCS optical networks 

      Perelló Muntan, Jordi; Spadaro, Salvatore; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (IEEE Computer Society Publications, 2009-02)
      Text en actes de congrés
      Accés obert
      Hybrid optical network architectures, combining benefits of optical circuit and burst switching technologies, become a natural evolution to improve overall network performance while reducing related costs. This paper ...
    • Correlation between traffic granularity and defragmentation periodicity in elastic optical networks 

      Sayyad Kodashenas, Pouria; Comellas Colomé, Jaume; Perelló Muntan, Jordi; Spadaro, Salvatore (Wiley-Blackwell, 2015-07-01)
      Article
      Accés obert
      While elastic optical network technologies have emerged as promising solutions for future ultra-high-speed optical transmission, the unavoidable spectral fragmentation problem that appears in such networks significantly ...
    • Cost-effective ML-powered polarization-encoded quantum key distribution 

      Ahmadian, Seyed Morteza; Ruiz Ramírez, Marc; Comellas Colomé, Jaume; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2022-07-01)
      Article
      Accés obert
      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 ...
    • Cross-connection management specialisation for WDM-OTN's 

      Rafel, Albert; Comellas Colomé, Jaume; Junyent Giralt, Gabriel; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2000)
      Text en actes de congrés
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      WDM optical transport networks (WDM-OTN) will use new all-optical nodes that will perform functions in the optical domain, using wavelength as a new network resource. This paper presents a new approach for the optical ...
    • DARIUS: a digital twin to improve the performance of quantum key distribution 

      Ahmadian, Seyed Morteza; Ruiz Ramírez, Marc; Comellas Colomé, Jaume; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2024-03-01)
      Article
      Accés obert
      Polarization encoded Quantum Key Distribution (QKD) is attracting great attention as it generates unlimitedly and unconditionally secure keys for different use cases. Despite its theoretical excellence based on quantum ...
    • Design and implementation of a GMPLS-controlled grooming-capable optical transport network 

      Agraz Bujan, Fernando; Velasco Esteban, Luis Domingo; Perelló Muntan, Jordi; Ruiz Ramírez, Marc; Spadaro, Salvatore; Junyent Giralt, Gabriel; Comellas Colomé, Jaume (IEEE Press. Institute of Electrical and Electronics Engineers, 2009-07)
      Article
      Accés obert
      Aiming at better resource utilization, an important requirement of future optical transport networks is the capability to accommodate subwavelength client flows efficiently. This can be put into action thanks to the ...
    • Designing a digital twin for quantum key distribution 

      Ahmadian, Seyed Morteza; Ruiz Ramírez, Marc; Berkay Ön, Mehmet; Singh, Sandeep Kumar; Comellas Colomé, Jaume; Proietti, Roberto; Yoo, Sung-Joo Ben; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2022)
      Text en actes de congrés
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      Classical optical devices lack precision when they operate on single photons. We report a Quantum Digital Twin (QDT) to improve Quantum Key Distribution (QKD) implementations. We show a QDT increasing the Key Exchange Rate ...
    • Dispersion-shifted fiber polarization scrambler based on faraday effect 

      Prat Gomà, Josep Joan; Comellas Colomé, Jaume (1999-07)
      Article
      Accés obert
      Demonstration of an all-fiber polarization scrambler based on the Faraday effect is carried out. The device has been constructed using dispersion-shifted fiber that has a major tolerance to bends than standard single-mode ...
    • Distributed architecture supporting intelligent optical measurement aggregation and streaming event telemetry 

      González Pacheco, Pol; Casellas Regi, Ramon; Pedreno Manresa, José Juan; Autenrieth, Achim; Boitier, Fabien; Shariati, Mohammad Behnam; Fischer, Johannes Karl; Ruiz Ramírez, Marc; Comellas Colomé, Jaume; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2023)
      Text en actes de congrés
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      A distributed telemetry system integrating optical measurement and event data collection is demonstrated. Measurements of optical spectra from Nokia Bell Labs, of optical transponders from ADVA and SDN controller events ...