Ara es mostren els items 1-20 de 154

  • 1.3 µm SDN-enabled optical packet switch architecture for high performance and programmable data center network 

    Miao, Wang; Agraz Bujan, Fernando; De Waardt, Huug D.; Spadaro, Salvatore; Sebastian Dorren, Harm Joseph; Calabretta, Nicola (Institute of Electrical and Electronics Engineers (IEEE), 2015)
    Text en actes de congrés
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    We demonstrate a 1.3 µm port-count scalable SDN-enabled optical packet switch architecture for programmable data-center networks. Experimental assessments of a 40Gb/s 4×4 switch system with SDN-control show <10-5 packet-loss ...
  • Access services availability and traffic forecast in PON deployment 

    Segarra Mullerat, Josep; Sales Zaragoza, Vicente; Prat Gomà, Josep Joan (IEEE, 2011)
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    Accés restringit per política de l'editorial
    In this paper, offered and new broadband services for residential customers are considered in Passive Optical Networks (PONs). The user bit rates together with QoS requirements are evaluated for the availability of ...
  • A column generation approach for large-scale RSA-based network planning 

    Ruiz Ramírez, Marc; Zotkiewicz, Mateusz; Velasco Esteban, Luis Domingo; Comellas Colomé, Jaume (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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    In flexgrid-based optical networks, the problem of finding optimal route and spectrum allocation (RSA) for the demands in a traffic matrix becomes harder to solve than similar problems in fixed DWDM networks, mainly due ...
  • Acotación de la probabilidad de error en un sistema de transmisión digital por fibra óptica 

    Agustí Comes, Ramon; Junyent Giralt, Gabriel (1980)
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    Accés obert
    Dans ce papier, on a obtenu des bornes inférieure et supérieure de la probabilité d 'erreur par symbole dans un systemè de transmission numérique par Fibre Optique. Pour celà, nous avons employé une simplification de la ...
  • Adaptive loading algorithms for optical OFDM transmission systems 

    Toporcer Korec, Norman (Universitat Politècnica de Catalunya, 2011-07-20)
    Treball Final de Grau
    Accés obert
  • A frequency approach on MIMO DSP for optical communication systems 

    Palou Garcia, Xavier (Universitat Politècnica de Catalunya, 2013-02-28)
    Projecte/Treball Final de Carrera
    120 months embargo
    [ANGLÈS] Spatial Division Multiplexing (SDM) has arisen during the last years as the most promising technique to overcome the increasing necessity of capacity of the communication systems while avoiding the theoretical ...
  • After failure repair optimization in dynamic flexgrid optical networks 

    Ruiz Ramírez, Marc; Zotkiewicz, Mateusz; Castro Casales, Alberto; Klinkowski, Miroslaw; Velasco Esteban, Luis Domingo; Pioro, Michal (The Optical Society (OSA), 2014)
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    We introduce the problem of reoptimizing the network after a link failure has been repaired as an effective way for reducing capacity usage and improving network performance. Numerical results show gains higher than 42%.
  • All-optical communication system based on orthogonal frequency-division multiplexing (OFDM) and optical time-division multiplexing (OTDM) 

    Cañibano Nuñez, Héctor (Universitat Politècnica de Catalunya, 2014-05-13)
    Projecte/Treball Final de Carrera
    Accés obert
    Realitzat a/amb:  Danmarks tekniske universitet
    [ANGLÈS] We propose and demonstrate a novel principle that combines optical orthogonal frequency-division multiplexing (O-OFDM) and optical time-division multiplexing (OTDM). The principle is based on generating and ...
  • A Method to Simultaneously Extract the Small-Signal Equivalent Circuit and Noise Parameters of Heterojunction Bipolar Transistors 

    Maya Sánchez, Mª del Carmen; Lázaro Guillén, Antoni; Pradell i Cara, Lluís (JOHN WILEY & SONS INC, 2006-07-31)
    Article
    Accés obert
    A method to extract the elements of the small-signal equivalent circuit and the noise parameters (NPs) of heterojunction bipolar transistors (HBTs) is presented. The extraction is done by simultaneous fitting of the measured ...
  • A multi-tenancy model based on resource capabilities and ownership for infrastructure management 

    Garcia Espin, Joan Antoni; Ferrer Riera, Jordi; Figuerola Fernández, Sergi; López Berga, Ester (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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    This paper presents a multi-tenancy model based on infrastructure resource capability virtualisation. The model, namely Resources, Ownership, Roles and Actors or RORA, approaches network and IT infrastructure virtualisation ...
  • Análisis de sistemas de predistorsión para moduladores electroópticos Mach-Zehnder usando el simulador Virtual Photonics Inc. (VPI) 

    Jordà Carmona, Albert (Universitat Politècnica de Catalunya, 2010-02-25)
    Treball Final de Grau
    Accés obert
  • Analysis and practice of digital transmission on optical carriers 

    Campana, Gabriele (Universitat Politècnica de Catalunya, 2010)
    Projecte/Treball Final de Carrera
    Accés obert
    Over the years, optical communication systems have been seen as one of the attractive solutions to the increasing high data rate in telecommunication systems. There also has been a tremendous increase in usage of ...
  • Analysis of back-propagation and RF pilot-tone based nonlinearity compensation for a 9x224Gb/s POLMUX-16QAM system 

    Díaz Souto, Alberto; Napoli, Antonio; Adhikari, Susmita; Maalej, Zied; Lobato Polo, Adriana P.; Kuschnerov, Maxim; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2012)
    Text en actes de congrés
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    We investigate the joint implementation of back-propagation and RF-pilot tone for fiber nonlinear compensation in POLMUX-16QAM and show that the nonlinear tolerance is drastically improved when compared to OFDM system
  • An ant-based algorithm for distributed routing and wavelength assignment in dynamic optical networks 

    Triay Marquès, Joan; Cervelló Pastor, Cristina (2010-05)
    Article
    Accés obert
    Future optical communication networks are expected to change radically during the next decade. To meet the demanded bandwidth requirements, more dynamism, scalability and automatism will need to be provided. This will ...
  • A new flexible ONU design for UDWDM-PON with coherent transceivers and smart activation process 

    Segarra Mullerat, Josep; Sales Zaragoza, Vicente; Prat Gomà, Josep Joan; Pous, R. (2014)
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    We present a novel ONU architecture for coherent UDWDM-PON with randomly distributed ONU wavelengths. The ONU is built with one or two lasers exhibiting simple limited thermal tunability in a specific optical band, where ...
  • A novel distributed fiber-optic strain sensor 

    García Hernández, Miguel J.; Ortega Redondo, Juan Antonio; Chávez Domínguez, Juan Antonio; Salazar Soler, Jorge; Turó Peroy, Antonio (2002-08)
    Article
    Accés restringit per política de l'editorial
    The theory of operation of a fiber-optic-based strain sensor system, suitable for long structures, is described. The proposed sensor design is composed of several hundreds of sections separated by reflectors in order to ...
  • Application on minimizing residual AM in DPSK UDWDM-PON ONU by integrated dual-EML 

    Chu Guang, Yong; Cano Valadéz, Iván Nicolás; Polo Querol, Víctor; Prat, Josep (2016-06-01)
    Article
    Accés obert
    A monolithically integrated dual electroabsorption modulated laser (DEML), consisting of distributed feedback laser (DFB) and electroabsorption modulator (EAM) sections, is proposed as a transmitter in an optical network ...
  • A simple strategy to improve spectrum use in multi-rate flexgrid optical networks 

    Comellas Colomé, Jaume; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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    A simple overprovisioning Spectrum Assignment strategy for flexgrid networks is demonstrated as efficient in terms of network throughput at a given blocking probability. Gain is obtained despite allocated spectrum exceeds ...
  • Assessment on the deployment of FTTH networks 

    Duran Rosich, Eduard (Universitat Politècnica de Catalunya, 2012-01-16)
    Projecte Final de Màster Oficial
    Accés obert
    While the technology to deploy FTTH networks has been known for some time, its deployment in Europe has been rather slow. Uncertainty about future regulation, low demand, a regulatory model base on the ladder of investment ...
  • A traffic intensity model for flexgrid optical network planning under dynamic traffic operation 

    Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2013)
    Text en actes de congrés
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    We obtain a model to estimate the highest traffic intensity that a flexgrid-based network can support in dynamic scenarios. A design problem is introduced to illustrate its application. Numerical results validate both ...