Exploració per autor "Fàbrega Sánchez, Josep Maria"
Ara es mostren els items 1-20 de 21
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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)
Text en actes de congrés
Accés restringit per política de l'editorialDirect 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. -
Channel crosstalk in ultra-dense WDM PON using time-switched phase diversity optical homodyne reception
Fàbrega Sánchez, Josep Maria; Prat Gomà, Josep Joan (Marian Marciniak, IEEE, 2007)
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Accés obertExperimental study of channel crosstalk effects in time-switched phase diversity optical homodyne reception is presented, precisely focused towards ultra-dense wavelength division multiplexed (WDM) passive optical networks ... -
Data plane elements for optical performance monitoring agnostic to the modulation format for disaggregated optical networks
Fàbrega Sánchez, Josep Maria; Locatelli, Fabiano; Nadal Reixats, Laia; Christodoulopoulos, Konstantinos; Svaluto Moreolo, Michela; Spadaro, Salvatore (2020)
Text en actes de congrés
Accés obertIn this paper, data plane alternatives for optical performance monitoring are presented as enablers to address the key challenges in disaggregated optical networks. In fact, a key element of the disaggregated networks is ... -
Decomposed radio access network over deployed passive optical networks using coherent optical OFDM transceivers
Fàbrega Sánchez, Josep Maria; Svaluto Moreolo, Michela; Chochol, Marcin; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2013-04-04)
Article
Accés restringit per política de l'editorialIn this paper, it is proposed to take advantage of the deployed passive optical network (PON) infrastructure by overlaying a decomposed radio access network (RAN) using a very dense WDM. Coherent optical orthogonal ... -
Demonstration of a full duplex PON featuring 2.5 Gbps Sub Carrier Multiplexing downstream and 1.25 Gbps upstream with colourless ONU and simple optics
Fàbrega Sánchez, Josep Maria; López Pastor, Eduardo Tommy; Lázaro Villa, José Antonio; Zuhdi, Muneer; Prat Gomà, Josep Joan (2008)
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Accés obertWe demonstrate a full-duplex DPSK SCM PON operating at 2.5Gbps/1.25Gbps bitrates, with RSOA ONU and simplified scheme. It achieves low sensitivity and is implemented with low-cost components. -
Deployment analysis of TDM/WDM single fiber PON with colourless ONU operating at 2.5 Gbps subcarrier multiplexed downstream and 1.25 gbps upstream
Fàbrega Sánchez, Josep Maria; El Mardini, Ahmad; Polo Querol, Víctor; Lázaro Villa, José Antonio; López Pastor, Eduardo Tommy; Soila, Risto; Prat Gomà, Josep Joan (2010)
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Accés obertA single-fiber full-duplex hybrid TDM/WDM-PON is demonstrated to operate at 2.5/1.25 Gbps rates, with RSOA ONU. It achieves high power budget (GPON compliant) at a distances higher than 20km, and serves up to 1280 users. -
Design of a wavelength control for coherent detection of high order modulation formats
Fàbrega Sánchez, Josep Maria; Prat Gomà, Josep Joan; Molle, Lutz; Freund, Ronald (IEEE Press. Institute of Electrical and Electronics Engineers, 2009)
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Accés obertAn automatic frequency control design is proposed and demonstrated. It is based on a high-speed optical VCO. An overall design has been performed, based on simulation results. Also, loop delay and phase noise impacts have ... -
Digital phase estimation method based on Karhunen-Loève series expansion for Coherent Phase Diversity Detection
Fàbrega Sánchez, Josep Maria; Prat Gomà, Josep Joan (2010)
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Accés obertA novel phase estimation method for coherent systems is presented and demonstrated. It outperforms 5.5 times the phase noise and spectral width tolerance respect to the other methods. -
Experimental demonstration of heterodyne phase-locked loop for optical homodyne PSK receivers in PONs
Fàbrega Sánchez, Josep Maria; Vilabrú, Lluís; Prat Gomà, Josep Joan (2008)
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Accés obertExperimental demonstration of heterodyne optical Phase-Locked Loop (oPLL), using simplest optics, is carried out. For the first time, the effect of loop delay has been experimentally characterized and compared directly to ... -
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)
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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)
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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 ... -
Modulation format recognition scheme based on discriminant network in coherent optical communication system
Yang, Fangxu; Tian, Qinghua; Xin, Xiangjun; Pan, Yiqun; Wang, Fu; Lázaro Villa, José Antonio; Fàbrega Sánchez, Josep Maria; Zhou, Sitong; Wang, Yongjun; Zhang, Qi (2024-10-01)
Article
Accés obertIn this paper, we skillfully utilize the discriminative ability of the discriminator to construct a conditional generative adversarial network, and propose a scheme that uses few symbols to achieve high accuracy recognition ... -
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)
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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)
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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)
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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 ...