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Ara es mostren els items 35-54 de 90

    • 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)
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      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)
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      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)
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      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)
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      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 ...

    • Flexible resource provisioning of polarization independent coherent PONs based on non-orthogonal multiple access and multiCAP modulation 

      Izquierdo Nuñez, David; Sarmiento Hernández, Samael; Barrio Segura, Miguel; Clemente Vicente, Jesús; Millán, Pablo; Lázaro Villa, José Antonio; Garces Gregorio, Juan Ignacio; Altabas Navarro, José Antonio; Puerta, Rafael; Rommel, Simon; Vegas Olmos, Juan J.; Tafur Monroy, Idelfonso (Institute of Electrical and Electronics Engineers (IEEE); Optical Society of America, 2021-07)
      Article
      Accés obert
      A combined non-orthogonal multiple access (NOMA) and multiband carrierless amplitude and phase modulation (multiCAP) scheme is proposed for flexible resource provisioning in coherent passive optical networks (PONs). While ...

    • Flexible WDM/FTDM passive optical network with RZ-seeded all-optical sub-wavelength grid engine 

      Schrenk, Bernhard; Katopodis, Vasilis; Bauwelinck, Johan; Lázaro Villa, José Antonio; Yin, Xin; Bakopoulos, Paraskevas; Spyropoulou, Maria; Qiu, Xing Z.; Avramopoulos, Hércules (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      All-optical FDM grid generation and channel selection is experimentally demonstrated through optical signal processing. Full-duplex 10G/2×10G transmission with reflective ONUs is validated for 20dB budget and 25km reach. ...

    • Fortistis: Split extension in dense passive optical networks by inline amplification with remote ASE-shaped pump delivery via colorless optical network units 

      Schrenk, Bernhard; Bonada Bo, Francesc; Lázaro Villa, José Antonio; Prat Gomà, Josep Joan (2010)
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      A method for extending the customer density via ASE-pumped splitters in the tree in a WDM/TDM-PON is presented. The influence of Rayleigh backscattering in the feeder is faced, originally prohibiting any upstream transmission.

    • FSK plus ASK/ASK operation for optical 20/10 gbps access networks with simple reflective user terminals 

      Schrenk, Bernhard; de Valicourt, Guilhem; Lázaro Villa, José Antonio; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2011)
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      Doubling of the downstream rate by reusing the reflective upstream modulator is demonstrated. With just two photo-detectors, a RSOA and a power splitter at the ONU, a 20/10 Gbps mode can be provided per wavelength.

    • Full-duplex 20/10 Gb/s WDM-PON with remodulation of chirped ASK and multi-level quaternary PAM and OFDM 

      Lázaro Villa, José Antonio; Bernhard, Schrenk; Maziotis, Alexandros; Cano Valadéz, Iván Nicolás; Bakopoulos, Paraskevas; Prat Gomà, Josep Joan; Avramopoulos, Hércules (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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      A full-duplex 20/10Gb/s WDM-PON is demonstrated by all-optical carrier recovery technique, showing that it is efficient and flexible for being applied to different downstream signals as non-/chirped ASK or multilevel signals ...

    • High capacity converged passive optical network and RoF-based 5G+ fronthaul using 4-PAM and NOMA-CAP signals 

      Sarmiento Hernández, Samael; Delgado Mendinueta, José Manuel; Altabas Navarro, 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), 2021-01-15)
      Article
      Accés obert
      Network architectural changes to satisfy all the 5G+ mobile network specifications and requirements are necessary due to the popularization of streaming and cloud applications on omnipresent portable devices. The combination ...

    • High customer density PON with passive amplification through distributed pump for > 1:1000 tree split 

      Schrenk, Bernhard; Bauwelinck, Johan; Bonada Bo, Francesc; Lázaro Villa, José Antonio; Xing-Zhi, Qiu; Chanclou, Philippe; Prat, Josep (2011-07-01)
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      Accés restringit per política de l'editorial
      A network architecture for tree-like passive optical networks (PONs) with high splitting ratios is proposed and experimentally demonstrated. Splits >1000 are shown to be feasible thanks to a noise-powered amplifier that ...

    • Innovació i investigació docent per millorar l’enginy i la creativitat dels alumnes d’Enginyeria i Arquitectura 

      Villasevil Marco, Francisco Javier; López Martínez, Antonio Miguel; Gómez Urgellés, Joan Vicenç; Salán Ballesteros, Maria Núria; Lázaro Villa, José Antonio; Majó Roca, Mª Antonia; Soler Ruiz, Juan; Gorchs Altarriba, Roser; Llorens García, Ariadna; Papiol Vera, Emilia; Vigara Campmany, Julio Enrique; López Membrilla, Manuel; López Membrilla, Dolores; Morillas Varón, Rafael; Taberna Torres, Judit; Bernadó Ortega, Miguel (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2013-02-08)
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      El nou marc de l’EEES i l’experiència docent en las àrees de l’Enginyeria i l’Arquitectura, indueix a pensar en la introducció de noves metodologies docents motivades per la necessitat d’adaptar, en la mesura del ...

    • L-Band In-Line Remote Amplification for an Extended WDM/PON Ring Architecture 

      Chatzi, Sotiria; Tomkos, Ioannis; Lázaro Villa, José Antonio; Prat Gomà, Josep Joan (IEEE Press. Institute of Electrical and Electronics Engineers, 2009-06-28)
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      In this paper, a study on a fully passive WDM/PON ring architecture which reaches 19 km distance, while serving more than 1000 users with symmetric several hundred Mbit/s per user is presented. The design is based on ...

    • Laboratorio virtual multiplataforma de educacion en ingenieria 

      Fernández Canti, Rosa M.; Lázaro Villa, José Antonio; Villar Zafra, A.; Zarza Sánchez, Sergio (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2012-07-06)
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      Se presenta un laboratorio virtual autónomo y multiplataforma para docencia. La plataforma implementada incluye un servidor con conexión SSH (Secure SHell) y un repositorio separado que contiene los experimentos virtuales. ...

    • Laboratorio virtual multiplataforma para educación en ingeniería 

      Fernández Canti, Rosa M.; Lázaro Villa, José Antonio; Villar Zafra, Aitor; Zarza Sánchez, Sergio (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació (ICE), 2012)
      Text en actes de congrés
      Accés obert
      Se presenta un laboratorio virtual autónomo y multiplataforma para docencia. La plataforma implementada incluye un servidor con conexión SSH (Secure SHell) y un repositorio separado que contiene los experimentos virtuales. ...

    • Layer 2 redesign for Metro-Access next generation PON 

      López Pastor, Eduardo Tommy; Polo Querol, Víctor; Lázaro Villa, José Antonio; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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      Necessary modifications and extensions into Layer 2 of the actual PON access are necessary in order to meet new requirements from services providers and users. We propose a flexible Transmission Convergence (TC) Layer ...

    • Low-cost all-optical switching nodes for ultra-dense optical metro-access networks 

      Sarmiento Hernández, Samael; Lázaro Villa, José Antonio (Institute of Electrical and Electronics Engineers (IEEE), 2023)
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      Optical metro-access networks (OMANs) must enable the connectivity among 5G-based radio stations, edge datacentres, businesses, and home users. In such a heterogenous scenario, greater scalability, higher levels of dynamic ...

    • Modeling of integrated erbium-doped waveguide amplifiers with overlapping factors methods 

      Vallés Brau, Juan Antonio; Lázaro Villa, José Antonio; Rebolledo Sanz, Miguel Ángel (1996-09)
      Article
      Accés restringit per política de l'editorial
      An analysis of the applicability of overlapping factors methods to the modeling of integrated erbium-doped waveguide amplifiers is presented. These methods offer as main advantage a considerable seduction in computation ...