Ara es mostren els items 41-60 de 115

    • Examen Final 

      Junyent Giralt, Gabriel; Soneira Ferrando, M. José; Gené Bernaus, Joan M. (Universitat Politècnica de Catalunya, 2016-06-02)
      Examen
      Accés restringit a la comunitat UPC
    • Experimental assessment of a high performance back-end PCE for Flexgrid optical network re-optimization 

      Gifre Renom, Lluís; Velasco Esteban, Luis Domingo; Navarro, Nacho; Junyent Giralt, Gabriel (The Optical Society (OSA), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A specialized high performance Graphics Processing Unit (GPU)-based back-end Path Computation Element (PCE) to compute re-optimization in Flexgrid networks is presented. Experimental results show 6x speedups compared to ...
    • Experimental assessment of an SDN-based control of OPS switching nodes for intra-data center interconnect 

      Agraz Bujan, Fernando; Miao, Wang; Ferrer Delgado, Alejandro; Bernini, Giacomo; Dorren, Harm; Calabretta, Nicola; Ciulli, Nicola; Perelló Muntan, Jordi; Peng, Shuping; Zervas, Georgios; Simeonidou, Dimitra; Junyent Giralt, Gabriel; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      An SDN-based control framework for OPS switches is experimentally assessed. The OpenFlow messages enabling control communication between SDN controller and OPS switch are validated. Dynamic OPS virtual network slices for ...
    • Experimental demonstration of Flex-Grid udWDM with 6.25GHz full-duplex frequency slots for metro/access & data centers 

      Altabas, Jose Antonio; Izquierdo, David; Sotelo, F; Garcés, I; Lázaro Villa, José Antonio; Lerín de la Santísima Trinidad, Adolfo; Spadaro, Salvatore; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Text en actes de congrés
      Accés obert
      Flex-Grid 6.25GHz full-duplex frequency slots are proposed for Metro/Access & Data-Center Networks allocating: 1Gbps Nyquist-DPSK over MZM for OLT/DC-ONU downlinks and OLT/DC up-downlinks; 1Gbps NRZ-DPSK over directly ...
    • 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 ...
    • Finding an objective cost for sliceable flexgrid transponders 

      Velasco Esteban, Luis Domingo; González de Dios, Óscar; López, Víctor; Fernández Palacios, Juan Pedro; Junyent Giralt, Gabriel (The Optical Society (OSA), 2014)
      Text en actes de congrés
      Accés obert
      We analyze the objective cost of SBVTs as a function of the traffic conveyed by IP/MPLS-over-flexgrid networks. Optimal results show that cost increment with respect to BVTs is related to the aggregation level.
    • Flexible PON Key technologies: digital advanced modulation formats and devices 

      Lázaro Villa, José Antonio; Altabas, Jose Antonio; Vairavel, S.; Karthikeyan, Subburayan; Sridharan, Madanagurusamy; Garces, Ignacio; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Flexible PON are future paradigm in parallel with flexible and elastic optical networks are under research for core networks. In the same way as those backbone optical networks can be significantly improved by following ...
    • 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 ...
    • GMPLS-based multidomain restoration: analysis, strategies, policies and experimental assessment 

      Velasco Esteban, Luis Domingo; Agraz Bujan, Fernando; Martínez, Ricardo; Casellas, Ramon; Spadaro, Salvatore; Muñoz, Raul; Junyent Giralt, Gabriel (IEEE Press. Institute of Electrical and Electronics Engineers, 2010-07-01)
      Article
      Accés restringit per política de l'editorial
      A connection spanning, for example, several countries crosses multiple optical backbone networks, each one controlled by different administrators or operators. In this context, the interworking of these networks is thus ...
    • High saturation in a nonlinear optical amplifier 

      Ruiz Moreno, Sergio; Junyent Giralt, Gabriel; Soneira Ferrando, M. José (1987)
      Text en actes de congrés
      Accés obert
    • How national IP/MPLS networks can benefit from flexgrid optical technology? 

      Velasco Esteban, Luis Domingo; Wright, Paul; Lord, Andrew; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés obert
      We design a 1113-node network and show that the optimum is a large Flexgrid core serving small metro areas. Cost savings of about 31% in the core and 23% in the metro are shown.
    • Impact of traffic delay tolerance on elastic optical networks performance 

      Comellas Colomé, Jaume; Nourmohammadi, Farzaneh; Junyent Giralt, Gabriel (2020)
      Text en actes de congrés
      Accés obert
      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 ...
    • Implementación del modelo de un multiplicador basado en el awg en un entorno de simulación cossap 

      Rafel Porti, Alberto; Roldán Andrade, Jesús; Tomás, D Sanz; Junyent Giralt, Gabriel (1996)
      Text en actes de congrés
      Accés obert
    • Improvement of the signal to noise ratio in direct detection with a semiconductor optical preamplifier 

      Ruiz Moreno, Sergio; Junyent Giralt, Gabriel (1987)
      Text en actes de congrés
      Accés obert
    • 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. ...
    • Influencia de los parámetros de un amplificador óptico en el valor óptimo del rendimiento cuántico del fotodetector en un enlace digital por fibra óptica 

      Ruiz Moreno, Sergio; Soneira Ferrando, M. José; Junyent Giralt, Gabriel (Consejo Superior de Investigaciones Científicas (CSIC), 1986)
      Text en actes de congrés
      Accés obert
      In this paper the performances introduced by a semiconductor optical amplifier in a fiber optical digital communication system are analyzed . The device is used as repeater as well as preamplifier at the photodetector input ...
    • Influencia del ruido AM del oscilador local en un sistema de transmisión coherente por fibra óptica con detección heterodina y modulación PSK 

      Junyent Giralt, Gabriel (1987)
      Text en actes de congrés
      Accés obert
      In this work the authors have studied amplitude noise generated in a semiconductor laser. The AM noise characterisation allows to study its influence in a fiber optic coherent transmission system using heterodyne-type ...
    • Influencia del ruido shot en las prestaciones de los ecualizadores en banda-base en sistemas de transmisión digital por fibra óptica 

      Casadevall Palacio, Fernando José; Junyent Giralt, Gabriel; Agustí Comes, Ramon (1985)
      Text en actes de congrés
      Accés obert
      En este trabajo se analiza la influencia del ruido Shot en la mejora que introduce un ecualizador en las prestaciones de un sistema de transmisión digital con fibra multimodo. Se consideran dos tipos de estructura para el ...
    • La Internet del Futur: Anàlisi retrospectiva, reflexió i posicionament estratègic 

      Serra Hurtado, Arturo; Alcober Segura, Jesús Ángel; Cervelló Pastor, Cristina; Domingo Pascual, Jordi; Fernández, Gabriel; Junyent Giralt, Gabriel; Oliver, Miquel; Paradells Aspas, Josep; Sallent Ribes, Sebastián (2008-07)
      Report de recerca
      Accés obert
      Aquest treball té com a objectiu analitzar la situació actual de la Internet, per proposar noves alternatives i dibuixar un possible camí cap a la Internet del Futur. Aquesta anàlisi vol ser un punt de partida, un document ...