Ara es mostren els items 7-26 de 85

    • 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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      Accés restringit per política de l'editorial
      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)
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      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)
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      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)
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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)
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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)
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      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)
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      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)
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      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)
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      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)
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      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)
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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)
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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 ...
    • Dynamic restoration in multi-layer IP/MPLS-over-flexgrid networks 

      Castro Casales, Alberto; Velasco Esteban, Luis Domingo; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (2013)
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      Accés restringit per política de l'editorial
      The recent advances in photonic technology will allow deploying flexgrid-based optical core networks in the near future. Although that technology favors more efficient spectrum utilization, multilayer IP/MPLS-over-flexgrid ...
    • Efficient spectrum assignment in elastic optical networks 

      Comellas Colomé, Jaume; Calzada Salvia, Xavier; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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      Accés restringit per política de l'editorial
      The Elastic Optical Network (EON) architecture has been proposed in response to the large capacity and diverse traffic granularity needs of the future Internet. By breaking the fixed-grid spectrum allocation of WDM networks, ...
    • Evaluation of Add/Drop flexibility requirements in future SDM-enabled ROADMs 

      Perelló Muntan, Jordi; Gené Bernaus, Joan M.; Klinkowski, Miroslaw; Comellas Colomé, Jaume; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2020)
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      In this paper, we evaluate five different architectures for implementing the Add/Drop module of future Spatial Division Multiplexing (SDM)-enabled Re-configurable Optical Add & Drop Multiplexers (ROADMs) with different ...
    • Experimental assessment of bulk path restoration in multi-layer networks using PCE-based global concurrent optimization 

      Castro Casales, Alberto; Martínez, Ricardo; Casellas Regi, Ramón; Velasco Esteban, Luis Domingo; Muñoz, Raúl; Vilalta, Ricard; Comellas Colomé, Jaume (2014-01-01)
      Article
      Accés restringit per política de l'editorial
      Generalized multi-protocol label switching-based multi-layer networks (MLN) combining packet and optical switching lead to jointly leverage intrinsic per-layer benefits such as statistical multiplexing and huge transport ...
    • Experimental demostration of an all-fiber polarization controller based on faraday rotation 

      Prat Gomà, Josep Joan; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (1995-12)
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      Accés obert
      An all-fiber device for the control of the state of polarization (SOP) is presented. The controller is high speed (its time response is less than 50 ms in the worst case), low loss (insertion losses are 2.5 dB independently ...
    • Experimental evaluation of a dynamic PCE-based regenerator-efficient IA-RWA algorithm in translucent WSON 

      Castro Casales, Alberto; Martínez, Ricardo; Velasco Esteban, Luis Domingo; Casellas Regi, Ramón; Muñoz González, Raül; Comellas Colomé, Jaume (2012)
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      We devise a novel dynamic PCE-based impairment-aware RWA algorithm in translucent GMPLS WSON that minimizes regenerator usage. Experimental evaluation carried out on the Open GMPLS/PCE control plane of CTTC ADRENALINE ...