Now showing items 21-40 of 637

  • Agile reconfigurable and traffic adapted all-optical access-metro networks 

    Segarra Mullerat, Josep; Sales Zaragozá, Vicente; Prat Gomà, Josep Joan (2009)
    Conference report
    Restricted access - publisher's policy
    The emerging high bandwidth and on-demand user applications require improvements in capacity, configurability and resiliency in next generation optical access networks to incrementally expand on the basis of customers ...
  • A GMPLS/OBS network architecture enabling QoS-aware end-to-end burst transport 

    Pedroso, Pedro; Perelló Muntan, Jordi; Spadaro, Salvatore; Careglio, Davide; Solé Pareta, Josep; Klinkowski, Miroslaw (2010-07-01)
    External research report
    Open Access
    This paper introduces a Generalized Multi-Protocol Label Switching (GMPLS)-enabled Optical Burst Switched (OBS) network architecture featuring end-to-end QoS-aware burst transport services. This is achieved by setting up ...
  • Algebraic bright and vortex solitons in defocusing media 

    Borovkova, Olga V.; Kartashov, Yaroslav V.; Malomed, Boris A.; Torner Sabata, Lluís (2011-08-15)
    Article
    Restricted access - publisher's policy
    We demonstrate that spatially inhomogeneous defocusing nonlinear landscapes with the nonlinearity coefficient growing toward the periphery as (1+|¿|¿) support one- and two-dimensional fundamental and higher-order bright ...
  • All-fiber mach-zehnder interferometer for dwdm-pon bidirectional multiplexing 

    Kurysheva, Anna (Universitat Politècnica de Catalunya, 2015-07)
    Master thesis
    Open Access
    Next generation optical access networks (FTTH, Fiber-to-the-Home), use wavelength division multiplexing (WDM) to highly increase the communication capacity to/from the users. A key issue in these networks is to split/combine ...
  • All-Optical Intra-PON Data Routing Between ONUs with a MG-Y Tunable Laser as 2.5 Gbps Burst-Mode Transmitter 

    Bonada Bó, Francesc Xavier; Schrenk, Bernhard; Fàbrega Sánchez, Josep Maria; Lázaro Villa, José Antonio; Forzati, Marco; Jean Rigole,, Pierre; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2011)
    Conference report
    Restricted access - publisher's policy
    Direct communication between ONUs is experimentally demonstrated with a tunable MG-Y laser in a ring+tree PON for 640 users, without passing electrically powered equipment.
  • A multiobjective wavelength routing approach combining network and traffic engineering with energy awareness 

    Palmieri, Francesco; Ricciardi, Sergio; Fiore, Ugo; Castiglione, Aniello; Careglio, Davide (2017-12-01)
    Article
    Open Access
    In modern optical networks, infrastructure management is faced with the challenge of using expensive equipment and communication resources as efficiently as possible. This now includes keeping power consumption costs at a ...
  • Análisis y simulación de un nodo de conmutación óptica 

    Bissan, Tarik (Universitat Politècnica de Catalunya, 2014-11-28)
    Bachelor thesis
    Open Access
    [ANGLÈS] The optical cross-connect (OXC) is a key element in current WDM networks. In this context, the design of OXCs is becoming very challenging since it has to fulfill requirements from legacy optical networks and be ...
  • An all-optical carrier recovery scheme for access networks with simple ASK modulation 

    Schrenk, Bernhard; Bakopoulos, Paraskevas; Kehayas, E.; Maziotis, Alexandros; Lázaro Villa, José Antonio; Avramopoulos, Hércules; Prat Gomà, Josep Joan (IEEE Press. Institute of Electrical and Electronics Engineers, 2011-09)
    Article
    Restricted access - publisher's policy
    We theoretically investigate and experimentally demonstrate a scheme for all-optical carrier recovery in loopback access networks that avoids orthogonal or complex modulation formats for the downstream or upstream signals. ...
  • Analysis and simulation of optical switches for intra-datacenter networks 

    Adetupe Osemwengie, Odiri (Universitat Politècnica de Catalunya, 2018-06)
    Bachelor thesis
    Open Access
    Este proyecto consiste en realizar un estudio de factibilidad para las interconexiones dentro de un centro de datos. Hay tantos diseños de arquitectura de una red de centro de datos (DCN), que es uno de los más básicos y ...
  • Analysis of NFV service design and management processes using ITIL and eTOM best practices 

    Nnabugwu, Samuel Nwadilobi (Universitat Politècnica de Catalunya, 2017-10-11)
    Master thesis
    Open Access
    The objective of this project is to analyse the design and process management of NFV and its operations using two of the most widely used and accepted best practices in telecommunication and IT industries. Focusing majorly ...
  • Analysis of performance degradation in sleep-mode enabled core optical networks [invited] 

    Pagès Cruz, Albert; Tornatore, Massimo; Perelló Muntan, Jordi; Spadaro, Salvatore; Morea, Annalisa (Institute of Electrical and Electronics Engineers (IEEE), 2015-03-01)
    Article
    Open Access
    Energy efficiency is an important target for the management of wavelength-division-multiplexing-based core optical networks. A possible power management strategy for energy-efficient optical networks consists in putting ...
  • Analysis of physical effects on multi-flow flex-grid optical networks 

    Salas Martínez, Alejandra (Universitat Politècnica de Catalunya, 2015-07-20)
    Bachelor thesis
    Open Access
    In the present project, the effect of physical impairments induced by the transmission trough a flexgrid optical network, has been studied by means of numerical simulations. In particular, the frequency filtering effect ...
  • Analysis of TCP over visible light communication networks 

    Navisoy Enriquez, Gustavo Sebastian (Universitat Politècnica de Catalunya, 2017-07-13)
    Master thesis
    Restricted access - author's decision
    The research and development of new technologies for the upcoming 5G networks is crucial in order to provide faster trustworthy data transmissions, with innovative materials and techniques, at a lower price. Within this ...
  • Analysis of the threshold between GPON and EP2P 

    Santos Boada, Germán; García-Torres, José; Domingo Pascual, Jordi (2009-10-26)
    External research report
    Open Access
    New services like Video on demand, Television (IPTV), high speed Internet access and Voice over IP on top the same link are called Triple Play services. These services demand very high bandwidth to customers. ADSL and ...
  • Analytical blocking probability model for hybrid immediate and advance reservations in optical WDM networks 

    Triay Marquès, Joan; Cervelló Pastor, Cristina; Vokkarane, Vinod M. (2013)
    Article
    Restricted access - publisher's policy
    Immediate reservation (IR) and advance reservation (AR) are the two main reservation mechanisms currently implemented on large-scale scientific optical networks. They can be used to satisfy both provisioning delay and low ...
  • Anderson localization in Bragg-guiding arrays with negative defects 

    Lobanov, Valery E.; Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2012-10)
    Article
    Restricted access - publisher's policy
    We show that Anderson localization is possible in waveguide arrays with periodically spaced defect waveguides having a lower refractive index. Such localization is mediated by Bragg reflection, and it takes place even if ...
  • An efficient dynamic bandwidth allocation for GPON long-reach extension systems 

    Sales Zaragozá, Vicente; Segarra Mullerat, Josep; Prat Gomà, Josep Joan (2014-08)
    Article
    Restricted access - publisher's policy
    Long-Reach (LR) extension is a promising scenario for the future next generation access networks, enabling less Central Offices (COs) in the field and a large number of customers in the access/metro area. Because of the ...
  • 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)
    Conference report
    Restricted access - publisher's policy
    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 ...
  • Angular surface slitons in sectorial hexagonal arrays 

    Szameit, Alexander; Kartashov, Yaroslav V.; Vysloukh, Victor A.; Heinrich, Matthias; Dreisow, Felix; Pertsch, T; Nolte, Stefan; Tünnermann, A; Lederer, F; Torner Sabata, Lluís (2008-07)
    Article
    Restricted access - publisher's policy
    We report on the experimental observation of corner surface solitons localized at the edges joining planar interfaces of hexagonal waveguide array with uniform nonlinear medium. The face angle between these interfaces has ...
  • An improved dynamic wavelength assignment in statistical UDWDM-PONs 

    Sales Zaragozá, Vicente; Segarra Mullerat, Josep; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2015)
    Conference report
    Restricted access - publisher's policy
    Dynamic wavelength assignment (DWA) is investigated for managing ultra-dense wavelength division multiplexing-passive optical networks (UDWDM-PONs). The optical network units (ONUs) own lasers under limited thermal tunability ...