Ara es mostren els items 21-40 de 88

    • Cost-effective transceiver based on an RSOA and a VCSEL for flexible uDWDM networks 

      Altabas, Jose Antonio; Izquierdo, David; Lázaro Villa, José Antonio; Garces, Ignacio (2016-05-15)
      Article
      Accés obert
      A cost-effective transceiver for a 1-Gb/s full-duplex ultra-dense wavelength division multiplexing optical link is proposed for flexible metro-access and 5G networks. The transceiver is based on a vertical cavity surface ...
    • Demonstration and field trial of a resilient hybrid NG-PON test-bed 

      Prat Gomà, Josep Joan; Polo Querol, Víctor; Schrenk, Bernhard; Lázaro Villa, José Antonio; Bonada Bo, Francesc; López Pastor, Eduardo Tommy; Omella, M.; Saliou, Fabienne; Trung Le, Quang; Chanclou, Philippe; Leino, D.; Soila, Risto; Spirou, S.; Costa, Liliana; Teixeira, A.; Tosi-Beleffi, G.M.; Klonidis, Dimitrios; Tomkos, Ioannis (2014-10-01)
      Article
      Accés restringit per política de l'editorial
      A multi-layer next generation PON prototype has been built and tested, to show the feasibility of extended hybrid DWDM/TDM-XGPON FTTH networks with resilient optically-integrated ring-trees architecture, supporting broadband ...
    • Demonstration of a full duplex PON featuring 2.5 Gbps Sub Carrier Multiplexing downstream and 1.25 Gbps upstream with colourless ONU and simple optics 

      Fàbrega Sánchez, Josep Maria; López Pastor, Eduardo Tommy; Lázaro Villa, José Antonio; Zuhdi, Muneer; Prat Gomà, Josep Joan (2008)
      Text en actes de congrés
      Accés obert
      We demonstrate a full-duplex DPSK SCM PON operating at 2.5Gbps/1.25Gbps bitrates, with RSOA ONU and simplified scheme. It achieves low sensitivity and is implemented with low-cost components.
    • Demonstration of a remotely dual-pumped long-reach PON for flexible deployment 

      Chanclou, Philippe; Schrenk, Bernhard; Lázaro Villa, José Antonio; Klonidis, Dimitrios; Bonada Bo, Francesc; Saliou, Fabienne; Polo Querol, Víctor; López Pastor, Eduardo Tommy; Le, Q.T.; Brenot, Romain; de Valicourt, Guilhem; Spirou, S.; Soila, Risto; Leino, D.; Tosi Beleffi, Giorgio M.; Tomkos, Ioannis; Chatzi, Sotiria; Teixeira, A.; Costa, L.; Kazmierski, Christophe; Prats, Jordi (2012-04-01)
      Article
      Accés restringit per política de l'editorial
      We propose and experimentally demonstrate a flexible wavelength division multiplexing/time division multiplexing network architecture for converged metro-access environment. Entire passiveness in the fiber plant is ...
    • Deployment analysis of TDM/WDM single fiber PON with colourless ONU operating at 2.5 Gbps subcarrier multiplexed downstream and 1.25 gbps upstream 

      Fàbrega Sánchez, Josep Maria; El Mardini, Ahmad; Polo Querol, Víctor; Lázaro Villa, José Antonio; López Pastor, Eduardo Tommy; Soila, Risto; Prat Gomà, Josep Joan (2010)
      Text en actes de congrés
      Accés obert
      A single-fiber full-duplex hybrid TDM/WDM-PON is demonstrated to operate at 2.5/1.25 Gbps rates, with RSOA ONU. It achieves high power budget (GPON compliant) at a distances higher than 20km, and serves up to 1280 users.
    • Desarrollo de un entorno de simulación para el aprendizaje de un algoritmo de navegación autónoma de un velero de 2 metros de eslora 

      Chacón Mosquera, Esteban; Mesegué Basallo, Josep Eudald; Fernández Canti, Rosa M.; Lázaro Villa, José Antonio (Universidade da Coruña. Servizo de Publicacións, 2021)
      Comunicació de congrés
      Accés obert
      Se presenta el desarrollo de un entorno virtual de simulación basado en Python Turtle para el entrenamiento de un algoritmo de aprendizaje por refuerzo destinado a la navegación autónoma de un velero de 2 metros de eslora. ...
    • Design of flexible udWDM metro-access network devices assisted by high resolution complex spectroscopy 

      Altabas, Jose Antonio; Izquierdo, David; Pascual, Álvaro; Sarmiento Hernández, Samael; Lázaro Villa, José Antonio; Garces, Ignacio; Villafranca, A. (2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The new cloud services, the Internet of Things (IoT) and the convergence of mobile and optical networks in the 5G scenario are pushing up the traffic demand over the metro-access networks. Flexible ultra-dense Wavelength ...
    • Digital Nyquist WDM for access networks using limited bandwidth reflective semiconductor optical amplifiers 

      Lázaro Villa, José Antonio; Knorr, Sebastian; Bernhard, Schrenk; Cano Valadéz, Iván Nicolás; Polo Querol, Víctor; Prat Gomà, Josep Joan; Carena, Andrea; Bosco, Gabriella (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Digital Nyquist-WDM is experimentally demonstrated using RSOA-based colorless ONUs, providing a 6-fold enhancement of transmission capacity through 25km fiber, and showing digital Nyquist-WDM as promising candidate for ...
    • Digitally processed modulation formats and integrated photonics for flexible optical metro-access networks 

      Lázaro Villa, José Antonio; Schrenk, Bernhard; Malligaraj, M.; Cano Valadéz, Iván Nicolás; Parra, M.; Sridharan, Madanagurusamy; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Digitally processed modulations formats such as Nyquist-WDM are investigated for implementation of future flexible optical networks, by using integrated photonic devices and moderate speed optoelectronics. We compare ...
    • Dual-operability and bandwidth partitioning enabled by an ONU with tandem-modulator 

      Schrenk, Bernhard; Bauwelinck, Johan; Lázaro Villa, José Antonio; Kazmierski, Christophe; Xing-Zhi, Qiu; Prat Gomà, Josep Joan (IEEE Press. Institute of Electrical and Electronics Engineers, 2011-09)
      Article
      Accés restringit per política de l'editorial
      An upgrade at the physical layer regarding unbundling and dynamic bandwidth provisioning of a wavelength division multiplexed access network is presented. The capability of a reflective modulator to act as a photodetector ...
    • Employing feed-forward downstream cancellation in optical network units for 2.5G/1.25G RSOA-based and 10G/10G REAM-based passive optical networks for efficient wavelength reuse 

      Schrenk, Bernhard; Lázaro Villa, José Antonio; Prat Gomà, Josep Joan (IEEE Press. Institute of Electrical and Electronics Engineers, 2009-06-28)
      Text en actes de congrés
      Accés obert
      Optical Network Units for Next-Generation Passive Optical Networks with wavelength reuse are investigated for asymmetrical 2.5 G/1.25 G and symmetrical 10 G/10 G down- and upstream data rates. The transmission performance ...
    • Enhancing dynamic student learning by teamwork in innovative projects at an Erasmus Mundus master subject adapted to the EHEA (EEES) 

      Lázaro Villa, José Antonio; Prat Gomà, Josep Joan; Fàbrega Canudas, José; Kouloumentas,, Christos (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació (ICE), 2010)
      Text en actes de congrés
      Accés obert
      The EHEA (EEES in Spain) is creating common academic degree standards comparable and compatible between the European countries. The definition of the new Credit unit, the ECTS, focused on the ...
    • Experimental assessment of 10 Gbps 5G multicarrier waveforms for high-layer split U-DWDM-PON-based fronthaul 

      Sarmiento Hernández, Samael; Altabas, Jose Antonio; Spadaro, Salvatore; Lázaro Villa, José Antonio (Institute of Electrical and Electronics Engineers (IEEE), 2019-05-15)
      Article
      Accés obert
      The current constant growth in mobile networks' traffic demands caused by the popularization of cloud and streaming services on personal devices, requires architectural changes so as to fulfill all new 5G mobile network ...
    • Experimental assessment of 5-10Gbps 5G multicarrier waveforms with intensity-modulation direct-detection for PONs 

      Sarmiento Hernández, Samael; Gran, Albert; Altabas, Jose; Scalabroni, Marco; Spadaro, Salvatore; Garces, Ignacio; Lázaro Villa, José Antonio (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The sensitivity performance of an IMDDOFDM/FBMC/UFMC/GFDM system with a PIN based receiver is experimentally evaluated for downstream in broadband passive optical networks. Results show sensitivities better than -14.5(-8.0)dBm ...
    • 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 evaluation and improvement methods for low cost transmitters in long reach PONs 

      Chatzi, Sotiria; Klonidis, Dimitrios; Tsekrekos, Christos P.; Lázaro Villa, José Antonio; Prat Gomà, Josep Joan; Tomkos, Ioannis (2013-12)
      Article
      Accés restringit per política de l'editorial
      In this paper, we first analyze the degradation stochastic resonance (DSR) effect in the context of adaptive averaging (AD-AVG) architectures. The AD-AVG is the adaptive version of the well-known AVG architecture . It is ...
    • Experimental investigation of 50-90 Gb/s IM-DD NOMA-CAP modulation for short range optical transmission applications 

      Sarmiento Hernández, Samael; Delgado Mendinueta, José Manuel; Altabas, Jose Antonio; Spadaro, Salvatore; Shinada, Satoshi; Furukawa, Hideaki; Vegas Olmos, Juan José; Lázaro Villa, José Antonio; Wada, Naoya (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The sensitivity performance of a NOMA-CAP system with a PIN-based receiver is experimentally assessed for short range transmission applications and different aggregated bit rates. Results show sensitivities better than ...
    • Extension of self-seeding to 10/2.5Gb/s T(W)DM PONs through remotely pumped ODN extenders 

      Prat Gomà, Josep Joan; Schrenk, Bernhard; Bonada, F.; De Valicourt, Guilhem; Lázaro Villa, José Antonio; Brenot, Romain (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Self-seeded upstream transmission is applied to power-splitting PONs through remote amplification at extender boxes. Tree splits up to 1:16 are found to be compatible for full-duplex 10/2.5Gb/s PONs with fully passive ...
    • Flex-Grid/SDM backbone network design with inter-core XT-limited transmission reach 

      Perelló Muntan, Jordi; Gené Bernaus, Joan M.; Pagès Cruz, Albert; Lázaro Villa, José Antonio; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2016-08-01)
      Article
      Accés restringit per política de l'editorial
      Spatial division multiplexing (SDM) has been presented as a key solution to circumvent the nonlinear Shannon limit of standard single-core fibers. To implement SDM, multi-core fiber (MCF) technology becomes a top candidate ...
    • 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 ...