Now showing items 1-20 of 109

    • 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)
      Conference lecture
      Open Access
      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-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)
      Conference report
      Restricted access - publisher's policy
      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)
      Conference report
      Restricted access - publisher's policy
      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)
      Conference report
      Restricted access - publisher's policy
      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 ...
    • Acotación de la probabilidad de error en un sistema de transmisión digital por fibra óptica 

      Agustí Comes, Ramon; Junyent Giralt, Gabriel (1980)
      Conference report
      Open Access
      Dans ce papier, on a obtenu des bornes inférieure et supérieure de la probabilité d 'erreur par symbole dans un systemè de transmission numérique par Fibre Optique. Pour celà, nous avons employé une simplification de la ...
    • Acotación rápida de la probabilidad de error en un sistema de transmisión digital por fibra óptica con símbolos no correlados 

      Junyent Giralt, Gabriel; Casadevall Palacio, Fernando José (Unión Científica Internacional de Radio (URSI), 1983)
      Conference report
      Open Access
      This paper deals with the problem of determinig an upper bound on the average conditional error probabilities in a digital optical fiber communication system with non-correlated symbols, in the presence of additive noise ...
    • 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)
      Conference report
      Restricted access - publisher's policy
      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 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)
      Conference report
      Open Access
      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)
      Conference report
      Open Access
      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 ...
    • Análisis del sincronismo de portadora mediante series de Volterra 

      Agustí Comes, Ramon; Junyent Giralt, Gabriel (1980)
      Conference report
      Open Access
      Computing the exact carrier phase-jitter delivered from the recovery circuit in a QPSK-TDMA satellite system is cumbersome and has not been sufficiently investigated due to the analytical difficulties with the non linearities. ...
    • 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)
      Conference report
      Open Access
      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 ...
    • Cancelación del ruido AM en sistemas de transmisión coherentes por fibra óptica: receptor balanceado 

      Ruiz Boqué, Sílvia; Junyent Giralt, Gabriel (Institución ferial de Madrid (IFEMA), 1988)
      Conference report
      Open Access
      In this work the authors have studied the AM noise influence over coherent transmission systems employing heterodyne-type detection. A dual-detector optical heterodyne receiver is also studied in arder to eliminate the LO ...
    • CAPEX study for grid dependent multi-layer IP/MPLS-over-EON using relative BV-WSS costs 

      Pedrola Escribà, Òscar; Velasco Esteban, Luis Domingo; Fernández-Palacios, Juan Pedro; Castro Casales, Alberto; Careglio, Davide; Junyent Giralt, Gabriel (2012)
      Conference report
      Open Access
      The impact of the frequency grid on the CAPEX required to deploy a multi-layer IP/MPLS-over-EON is analyzed. Results showing significant savings at the electronic layer motivate the introduction of narrower grids with ...
    • Caracterización estadística del amplificador óptico semiconductor aplicado en un enlace digital por fibra óptica 

      Ruiz Moreno, Sergio; Junyent Giralt, Gabriel (Consejo Superior de Investigaciones Científicas (CSIC), 1986)
      Conference report
      Open Access
      In this paper an statistical model for the semiconductor optical amplifier CSLA) working in linear regime is developped. This model, based on the STT theory, allows the calculation of any number of moments of the statistical ...
    • Carrier SDN to control flexgrid-based inter-datacenter connectivity 

      Asensio Carmona, Adrian; Velasco Esteban, Luis Domingo; Ruiz Ramírez, Marc; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      Datacenter federations are able to manage appropriately the green energy resources available in each datacenter (DC) thanks to their geographically distributed infrastructure, thus reducing energy expenditure. Scheduling ...
    • Cognitive science applied to reduce network operation margins 

      Notivol Calleja, Luis David; Spadaro, Salvatore; Perelló Muntan, Jordi; Junyent Giralt, Gabriel (2017-06-08)
      Article
      Open Access
      In an increasingly competitive market environment with smaller product offer differentiation, a continuous maximization of efficiency, while guarantying the quality of the provided services, remains a main objective for ...
    • 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)
      Conference report
      Open Access
      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 ...
    • Decomposed radio access network over deployed passive optical networks using coherent optical OFDM transceivers 

      Fàbrega Sánchez, Josep Maria; Svaluto Moreolo, Michela; Chochol, Marcin; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2013-04-04)
      Article
      Restricted access - publisher's policy
      In this paper, it is proposed to take advantage of the deployed passive optical network (PON) infrastructure by overlaying a decomposed radio access network (RAN) using a very dense WDM. Coherent optical orthogonal ...
    • Desarrollo sistemas opticos coherentes a 2.5 gb/s 

      Junyent Giralt, Gabriel (1991)
      Conference report
      Open Access
      The paper is concerning to a R&D proj ect to develop Optical Coherent Systems working at 2. 5 Gbitjs data speed and l. 55 um operating wavelength. Three are the main phases in the project plan: the Lab Model system, built ...
    • 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
      Open Access
      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 ...