Exploració per autor "Junyent Giralt, Gabriel"
Ara es mostren els items 53-72 de 115
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Impact of traffic delay tolerance on elastic optical networks performance
Comellas Colomé, Jaume; Nourmohammadi, Farzaneh; Junyent Giralt, Gabriel (2020)
Text en actes de congrés
Accés obertElastic Optical Networks (EON) are considered as a valuable solution to enhance optical networks efficiency due to their superior network spectrum use. By breaking the traditional fixed grid of WDM networks, the spectrum ... -
Implementación del modelo de un multiplicador basado en el awg en un entorno de simulación cossap
Rafel Porti, Alberto; Roldán Andrade, Jesús; Tomás, D Sanz; Junyent Giralt, Gabriel (1996)
Text en actes de congrés
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Improvement of the signal to noise ratio in direct detection with a semiconductor optical preamplifier
Ruiz Moreno, Sergio; Junyent Giralt, Gabriel (1987)
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Improving link spectrum utilization in Flexgrid optical networks
Comellas Colomé, Jaume; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2015-07-01)
Article
Accés obertFlexible grid optical networks are emerging as an appealing solution for future high-speed optical transport because they can provide superior flexibility and scalability and cope with the rapid growth of Internet traffic. ... -
Influencia de los parámetros de un amplificador óptico en el valor óptimo del rendimiento cuántico del fotodetector en un enlace digital por fibra óptica
Ruiz Moreno, Sergio; Soneira Ferrando, M. José; Junyent Giralt, Gabriel (Consejo Superior de Investigaciones Científicas (CSIC), 1986)
Text en actes de congrés
Accés obertIn this paper the performances introduced by a semiconductor optical amplifier in a fiber optical digital communication system are analyzed . The device is used as repeater as well as preamplifier at the photodetector input ... -
Influencia del ruido AM del oscilador local en un sistema de transmisión coherente por fibra óptica con detección heterodina y modulación PSK
Junyent Giralt, Gabriel (1987)
Text en actes de congrés
Accés obertIn this work the authors have studied amplitude noise generated in a semiconductor laser. The AM noise characterisation allows to study its influence in a fiber optic coherent transmission system using heterodyne-type ... -
Influencia del ruido shot en las prestaciones de los ecualizadores en banda-base en sistemas de transmisión digital por fibra óptica
Casadevall Palacio, Fernando José; Junyent Giralt, Gabriel; Agustí Comes, Ramon (1985)
Text en actes de congrés
Accés obertEn este trabajo se analiza la influencia del ruido Shot en la mejora que introduce un ecualizador en las prestaciones de un sistema de transmisión digital con fibra multimodo. Se consideran dos tipos de estructura para el ... -
La Internet del Futur: Anàlisi retrospectiva, reflexió i posicionament estratègic
Serra Hurtado, Arturo; Alcober Segura, Jesús Ángel; Cervelló Pastor, Cristina; Domingo Pascual, Jordi; Fernández, Gabriel; Junyent Giralt, Gabriel; Oliver, Miquel; Paradells Aspas, Josep; Sallent Ribes, Sebastián (2008-07)
Report de recerca
Accés obertAquest treball té com a objectiu analitzar la situació actual de la Internet, per proposar noves alternatives i dibuixar un possible camí cap a la Internet del Futur. Aquesta anàlisi vol ser un punt de partida, un document ... -
Laser noise impact in the design of an heterodyne optical PSK receiver
Ruiz Boqué, Sílvia; Junyent Giralt, Gabriel (1989)
Text en actes de congrés
Accés obertAn evaluation of the performance of a coherent optical receiver for binary PSK (phase-shift keying) is carried out. Both AM and FM noise due to transmitter and local oscillator semiconductor lasers have been taken into ... -
Low complexity bit rate variable transponders based on optical OFDM with PAPR reduction capabilities
Nadal, Laia; Svaluto Moreolo, Michela; Fàbrega Sánchez, Josep Maria; Junyent Giralt, Gabriel (2012)
Text en actes de congrés
Accés restringit per política de l'editorialIn this paper, we propose low complexity bit rate variable transponders for adaptive DC biased Optical OFDM systems. The transponders are based on an alternative transform, the fast Hartley transform (FHT), and use ... -
Low complexity PAPR reduction techniques for clipping and quantization noise mitigation in direct-detection O-OFDM systems
Nadal Reixats, Laia; Svaluto Moreolo, Michela; Fàbrega Sánchez, Josep Maria; Junyent Giralt, Gabriel (2014-06-01)
Article
Accés restringit per política de l'editorialWe present different distortionless peak-to-average power ratio (PAPR) reduction techniques that can be easily applied, without any symmetry restriction, in direct-detection (DD) optical orthogonal frequency division ... -
Minimum channel spacing in an ofdm cpfsk optical coherent system
Prat Gomà, Josep Joan; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (1998-03)
Article
Accés restringit per política de l'editorialChannel spacing in optical frequency-division multiplexed (OFDM) coherent optical systems with continuous-phase frequency-shift-keying (CPFSK) is obtained both theoretically and experimentally. The bit error ratio is derived ... -
Modelling and performance evaluation of a national scale switchless based network
Careglio, Davide; Solé Pareta, Josep; Junyent Giralt, Gabriel; Spadaro, Salvatore; Masip Torne, Jaume; Noguera Serra, Juan José (Springer, 2000)
Text en actes de congrés
Accés restringit per política de l'editorialIn a packet switching based scenario, optical technologies can not completely overcome the problem of insufficient network capacity, due to limitations produced by the presence of electronic switches and regenerators in ... -
Modelo estadístico del láser amplificador en un sistema de transmisión digital por fibra óptica monomodo
Ruiz Moreno, Sergio; Junyent Giralt, Gabriel (Fundación Universidad-Empresa, 1986)
Text en actes de congrés
Accés obertEn este trabajo se obtiene un modelo estadístico del laser amplificador semiconductor y se desarrolla la metodología y el software necesarios para poder obtener resultados analíticos. En definitiva, se consigue conocer ... -
NORMA: Network Operator Revenues Maximization
Velasco Esteban, Luis Domingo; Ruiz Ramírez, Marc; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (IEEE, 2012)
Text en actes de congrés
Accés restringit per política de l'editorialA great part of core network operators’ gross profit comes from the provisioned connectivity services. In this work, we analyze the provisioning of differentiated services in current Shared Path Protection (SPP) environments. ... -
Novel power efficient optical OFDM based on Hartley transform for intensity-modulated direct-detection systems
Svaluto Moreolo, Michela; Muoz, R.; Junyent Giralt, Gabriel (2010-03)
Article
Accés obertWe present a novel optical orthogonal frequency division multiplexing (O-OFDM) scheme, suitable for intensity-modulated direct-detection systems, where the modulation/demodulation processing takes advantage of the fast ... -
On the benefits of multi-path recovery in flexgrid optical networks
Castro Casales, Alberto; Velasco Esteban, Luis Domingo; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (2014-12-01)
Article
Accés restringit per política de l'editorialWe propose a new recovery scheme, called multi-path recovery (MPR), specifically designed for flexgrid-based optical networks. It combines protection and restoration schemes to jointly recover, in part or totally, the ... -
On the performance of dynamic source aggregation of sub-wavelength connections in EONs
Sayyad Khodashenas, Pouria; Comellas Colomé, Jaume; Perelló Muntan, Jordi; Spadaro, Salvatore; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2014)
Text en actes de congrés
Accés restringit per política de l'editorialIn elastic optical networks, heterogeneous traffic demands are typically supported by a single type of bandwidth-variable transmitters, which is not always spectrum and cost efficient. In light of this, we recently proposed ... -
Optical filter cascading effects in a phase modulated coherent optical OFDM transmission system based on Hartley transform
Chochol, M.; Fàbrega Sánchez, Josep Maria; Svaluto Moreolo, Michela; Junyent Giralt, Gabriel (IEEE, 2012)
Text en actes de congrés
Accés restringit per política de l'editorialEffects of cascading optical filters are investigated for a phase modulated coherent optical OFDM system based on Hartley transform. The evaluation is performed by means of numeric simulations in a 10 Gb/s system with a ... -
Optical interconnection for datacenters: To switch or not to switch
Comellas Colomé, Jaume; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2023)
Text en actes de congrés
Accés obertOptical interconnection is seen as a promising solution to alleviate the congestion problems inside datacenters. Previously reported studies focus solely on optical circuit switching to establish connections. In this work ...