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Ara es mostren els items 1-20 de 90

    • 1Gbps full-duplex 5GHz frequency slots uDWDM flexible metro/access networks based on VCSEL-RSOA transceiver 

      Altabas, Jose Antonio; Izquierdo, David; Lázaro Villa, José Antonio; Garces, Ignacio (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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      1Gbps full-duplex 5GHz frequency slot is proposed for uDWDM Flexible Metro-Access Networks. The costeffective ONU transceiver is based on VCSEL as LO for coherent reception and seed for phase-modulated RSOA, providing ...

    • 1Gbps full-duplex links for ultra-dense-WDM 6.25GHz frequency slots in optical metro-access networks 

      Altabas, Jose Antonio; Izquierdo, David; Lázaro Villa, José Antonio; Lerin, Adolfo; Sotelo, Félix; Garces, Ignacio (2016-01-11)
      Article
      Accés obert
      1Gbps full-duplex optical links for 6.25GHz ultra dense WDM frequency slots are demonstrated and optimized for cost-effective metro-access networks. The OLT-ONU downlinks are based on 1Gbps Nyquist-DPSK using MZM and ...

    • 25Gbps quasicoherent receiver for beyond NG-PON2 access networks 

      Altabas, Jose Antonio; Suhr, Lau F.; Silva Valdecasa, Guillermo; Lázaro Villa, José Antonio; Garces, Ignacio; Jensen, J.B.; Clausen, Anders T. (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      A 25Gbps quasicoherent receiver with simple DSP has been experimentally validated for 25G access networks. It exhibits a sensitivity of -24. 7dBm after 20km SSMF and duobinary decoding and provides a power budget of 25. 7dB.

    • 5G connected vehicles supported by optical fiber access 

      Lázaro Villa, José Antonio; Coves Garrido, Massiel; Sarmiento Hernández, Samael; Altabas, Jose Antonio; Lerin, Adolfo (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      Future autonomous vehicle will require a high level of computation, communication, sensing and fast response actuation. Communication among vehicles, and vehicles to infrastructure, accessing to remote systems and services ...

    • 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)
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      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.

    • ALLIANCE Project: Architecting a knowledge-defined 5G-enabled network infrastructure 

      Careglio, Davide; Spadaro, Salvatore; Cabellos Aparicio, Alberto; Lázaro Villa, José Antonio; Perelló Muntan, Jordi; Barlet Ros, Pere; Gené Bernaus, Joan M.; Paillissé Vilanova, Jordi (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      Leaving the current 4th generation of mobile communications behind, 5G will represent a disruptive paradigm shift integrating access networks, ultra-high capacity access/metro/core optical networks and intra-datacentre ...

    • 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)
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      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. ...

    • An Open source multiplatform virtual laboratory for engineering education : special focus paper 

      Fernández Canti, Rosa M.; Lázaro Villa, José Antonio; Zarza Sánchez, Sergio; Villar Zafra, Aitor (2012-11)
      Article
      Accés obert
      An autonomous and multiplatform virtual laboratory for educational purposes is presented. The implemented platform includes a server with a SSH (Secure SHell) connection and a separated repository containing the virtual ...

    • Area and laser power scalability analysis in photonic networks-on-chip 

      Abadal Cavallé, Sergi; Cabellos Aparicio, Alberto; Lázaro Villa, José Antonio; Nemirovsky, Mario; Alarcón Cot, Eduardo José; Solé Pareta, Josep (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      In the last decade, the field of microprocessor architecture has seen the rise of multicore processors, which consist of the interconnection of a set of independent processing units or cores in the same chip. As the number ...

    • Assessment of Flex-grid/SDM backbone networks under inter-core XT-limited transmission reach 

      Perelló Muntan, Jordi; Gené Bernaus, Joan M.; Lázaro Villa, José Antonio; Pagès Cruz, Albert; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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      In the present paper, we estimate the transmission reach of the optical signals through several state-of-the-art multi-core fibers reported in the literature considering ASE noise and inter-core crosstalk. Using these ...

    • Bandwidth assignment criteria against rayleigh backscattering effect in TDM-PON single-fibre wavelength-reuse networks 

      López Pastor, Eduardo Tommy; Lázaro Villa, José Antonio; Polo Querol, Víctor; Prat Gomà, Josep Joan (IEEE, 2011)
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      In this paper, theoretical and numerical analysis for Rayleigh Backscattering (RB) in TDM-PON full-duplex single-fiber bidirectional transmission with burst mode upstream and reflective ONU are presented. The results show ...

    • Build your own optical amplifier: design, implementation and physical model of an Erbium Doped-Fiber Amplifier 

      Lázaro Villa, José Antonio; Martinez de Morentin, Martí; Marzo, Nuria; Rubies, Oriol; Arduengo, Miguel (Universitat Politècnica de Catalunya, 2018-05-31)
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    • C + L band extended reach amplified next generation access networks 

      Andre, P. S; Teixeira, A.L.J.; Girão, J.P.; Neto, B.; Rocha, A.M.; Reis, Catarina Isabel Ferreira Viveiros Tavares dos; Dionisio, R.P; Chatzi, Sotiria; Bonada Bo, Francesc; Lázaro Villa, José Antonio (2011-07)
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      The feasibility of optical amplification solutions for extended reach next generation access networks in C + L bands is studied. Amplification schemes based on Raman fiber amplifier and their combination with remotely ...

    • C plus L band extended reach amplified next generation access networks 

      Andre, P. S; Teixeira, A.L.J.; Girão, J.P.; Neto, B.; Rocha, A.M.; Reis, Catarina Isabel Ferreira Viveiros Tavares dos; Dionisio, R.P; Chatzi, Sotiria; Bonada Bo, Francesc; Lázaro Villa, José Antonio (2011-07-20)
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      The feasibility of optical amplification solutions for extended reach next generation access networks in C + L bands is studied. Amplification schemes based on Raman fiber amplifier and their combination with remotely ...

    • Chirp-based direct phase modulation of VCSELs for cost-effective transceivers 

      Altabas, Jose Antonio; Izquierdo, David; Lázaro Villa, José Antonio; Garces, Ignacio (2017-02-01)
      Article
      Accés obert
      A 2.5Gb/s DPSK transmitter based on direct phase modulation of a VCSEL using its own chirp is proposed. The VCSEL, which wavelength is 1539.84nm, has been characterized both static and dynamically. The sensitivity of a ...

    • Colorless FSK Demodulation and Detection With Integrated Fabry-Perot-Type SOA/REAM 

      Schrenk, Bernhard; Lázaro Villa, José Antonio; Kazmierski, Christophe; Prat Gomà, Josep Joan (2010-06-01)
      Article
      Accés obert
      A receiver for optical frequency modulated signals, based on colorless demodulation and detection, is presented. An integrated combination of semiconductor optical amplifier (SOA) and reflective electroabsorption modulator ...

    • Colourless FSK/ASK optical network unit based on a Fabry Pérot type SOA/REAM for symmetrical 10 Gb/s WDM-PONs 

      Schrenk, Bernhard; Lázaro Villa, José Antonio; Kazmierski, Christophe; Prat Gomà, Josep Joan (2009-09-20)
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      An Optical Network Unit based on colourless detection of optical frequency modulated signals based on a combination of Semiconductor Optical Amplifier and Reflective Electroabsorption modulator with intensity remodulation ...

    • Cost-effective DWDM ROADM design for flexible sustainable optical metro–access networks 

      Sarmiento Hernández, Samael; Altabas, Jose Antonio; Izquierdo, David; Garces, Ignacio; Spadaro, Salvatore; Lázaro Villa, José Antonio (Institute of Electrical and Electronics Engineers (IEEE), 2017-12)
      Article
      Accés obert
      Architectural changes are required for the underlying networks to support the expected Internet data traffic volume growth caused by the popularization of cloud services, 5G-based services, and social networks, to provide ...

    • Cost-effective ROADM architecture for C/DWDM metro-access networks convergence 

      Sarmiento Hernández, Samael; Spadaro, Salvatore; Lázaro Villa, José Antonio (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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      The Internet data traffic constant growth caused by the popularization of cloud services, mobile and social networks is requiring changes at the underlying networks in order to enable scalability whereas supporting a highly ...

    • Cost-effective ROADM design to maximize the traffic load capacity of u-DWDM coherent metro-access networks 

      Spadaro, Salvatore; Sarmiento Hernández, Samael; Lázaro Villa, José Antonio (2018-11-01)
      Article
      Accés obert
      The current constant growing in traffic demands caused by the popularization of cloud services, mobile and social networks is requiring architectural changes at the underlying networks so as to provide a more highly dynamic ...