Ara es mostren els items 13-32 de 85

    • 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
      Accés obert
      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
      Accés obert
      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
      Accés obert
      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)
      Text en actes de congrés
      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)
      Text en actes de congrés
      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)
      Text en actes de congrés
      Accés obert
      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)
      Article
      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)
      Text en actes de congrés
      Accés obert
      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 ...
    • Extending the flexgrid optical core towards the edges 

      Velasco Esteban, Luis Domingo; Ruiz Ramírez, Marc; Castro Casales, Alberto; Comellas Colomé, Jaume (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      National IP/MPLS network have being designed on top of fixed-grid DWDM optical networks so to spread out covering large areas. Besides, multilayer IP/MPLS-over-DWDM networks take advantage from grooming to achieve high ...
    • Feature-based optical spectrum monitoring for failure detection and identification 

      Shariati, Mohammad Behnam; Ruiz Ramírez, Marc; Comellas Colomé, Jaume; Velasco Esteban, Luis Domingo (2019)
      Text en actes de congrés
      Accés obert
      In this paper, we explore the benefits of analysing the optical spectrum of lightpaths for soft-failure detection and identification in Spectrum Switched Optical Network. We present a framework exploiting machine learning ...
    • Global concurrent optimization: advantages and opportunities in flexgrid-based networks 

      Castro Casales, Alberto; Velasco Esteban, Luis Domingo; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In future flexgrid core networks the amount of lightpaths might increase significantly as a consequence of the finer granularity in the use of the optical spectrum. Different spectrum bandwidth can be allocated to each ...
    • GMPLS control plane network design with resilience guarantees 

      Ruiz Ramírez, Marc; Perelló Muntan, Jordi; Velasco Esteban, Luis Domingo; Spadaro, Salvatore; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (2011-01-01)
      Article
      Accés restringit per política de l'editorial
      A one-to-one association between data and control channels has traditionally existed in transport networks. Being the control plane embedded in the data plane, the design of the former, as well as its resilience, has been ...
    • High capacity optical networks based on space division multiplexing 

      Shariati, Mohammad Behnam; Comellas Colomé, Jaume; Klonidis, Dimitrios; Velasco Esteban, Luis Domingo; Tomkos, Ioannis (John Wiley & sons, 2017-09-01)
      Capítol de llibre
      Accés restringit per política de l'editorial
      This book discusses Elastic Optical Networks (EONs) from an operational perspective. It presents algorithms that are suitable for real-time operation and includes experimental results to further demonstrate the feasibility ...
    • 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)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      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 ...