Exploració per autor "Fàbrega Sánchez, Josep Maria"
Ara es mostren els items 10-20 de 20
-
Filter features extraction from optical spectra
Locatelli, Fabiano; Christodoulopoulos, Konstantinos; Fàbrega Sánchez, Josep Maria; Svaluto Moreolo, Michela; Nadal Reixats, Laia; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2020)
Text en actes de congrés
Accés obertWe propose a method to estimate the central frequency and the bandwidth of optical filters, that relies on optical spectra captured with optical channel monitors at ROADM’s ingress port. We demonstrate for both features ... -
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 ... -
Low cost homodyne transceiver for UDWDM access networks
Fàbrega Sánchez, Josep Maria; Prat Gomà, Josep Joan (2009)
Text en actes de congrés
Accés restringit per política de l'editorialWe propose and demonstrate a DPSK homodyne architecture based on a simple phase-diversity set-up with analog processing. Due to its spectral properties, it remarkably increases the phase noise tolerance of more conventional ... -
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 ... -
Phase modulated optical OFDM upstream with IM/DD downstream for full-duplex 10 Gb/s bidirectional transmission over a single wavelength with a reflective SOA
Fàbrega Sánchez, Josep Maria; Chochol, Marcin; Svaluto Moreolo, Michela; Lázaro Villa, José Antonio; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2013)
Text en actes de congrés
Accés restringit per política de l'editorialThe feasibility of a phase modulated optical OFDM upstream transmission employing IM/DD downstream for achieving a bidirectional transmission with symmetric data rate of 10 Gb/s over a single wavelength is investigated for ... -
Simple intradyne PSK system for UDWDM-PON
Prat Gomà, Josep Joan; Polo Querol, Víctor; Zakynthinos, P.; Cano Valadéz, Iván Nicolás; Tabares, J.; Fàbrega Sánchez, Josep Maria; Klonidis, Dimitrios; Tomkos, Ioannis (2012-12-17)
Article
Accés obertA homodyne coherent receiver for ultra-dense WDM-PON with off the shelf components is presented. It consists of a conventional DFB, phase switched clock signal, an optical coupler instead of a 90º hybrid, balanced ... -
SOA/REAM as Vector Modulator for QAM Upstream
Schrenk, Bernhard; Fàbrega Sánchez, Josep Maria; Kazmierski, Christophe; Lázaro Villa, José Antonio; Prat Gomà, Josep Joan (2011)
Text en actes de congrés
Accés restringit per política de l'editorialSimultaneous encoding of information in the optical phase and amplitude for upstream transmission is demonstrated with an integrated SOA/REAM of small form factor. The crosstalk penalties between the QAM tributaries are ... -
Spectral processing techniques for efficient monitoring in optical networks
Locatelli, Fabiano; Christodoulopoulos, Konstantinos; Svaluto Moreolo, Michela; Fàbrega Sánchez, Josep Maria; Nadal Reixats, Laia; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2021-07-01)
Article
Accés obertHaving ubiquitous optical monitors in dense wavelength-division multiplexing (DWDM) or flex-grid networks allows the estimation in real time of crucial parameters. Such monitoring would be even more important in disaggregated ... -
Ultra-dense, transparent and resilient ring-tree access network using coupler-based remote nodes and homodyne transceivers
Fàbrega Sánchez, Josep Maria; Prat Gomà, Josep Joan (IEEE Press. Institute of Electrical and Electronics Engineers, 2009)
Text en actes de congrés
Accés obertWe propose an Ultra-Dense Wavelength Division Multiplex Passive Optical Network (UD-WDM-PON) based on homodyne detection in a totally transparent ring-tree implementation. It is based on time switching phase diversity ... -
WDM overlay of distributed base stations in deployed passive optical networks using coherent optical OFDM transceivers
Fàbrega Sánchez, Josep Maria; Svaluto Moreolo, Michela; Chochol, M.; Junyent Giralt, Gabriel (IEEE, 2012)
Text en actes de congrés
Accés restringit per política de l'editorialIt is proposed to reuse the deployed PON infrastructure by overlaying distributed radio base stations by means of very dense WDM with narrow channel spacings. In order to cope with that while minimizing its impact onto ...