Exploració per autor "Prat Gomà, Josep Joan"
Ara es mostren els items 6-25 de 141
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A new flexible ONU design for UDWDM-PON with coherent transceivers and smart activation process
Segarra Mullerat, Josep; Sales Zaragozá, Vicente; Prat Gomà, Josep Joan; Pous, R. (2014)
Text en actes de congrés
Accés restringit per política de l'editorialWe 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 methodology for measuring coherent homowavelength crosstalk in an optical signal supervisory system
Rafel Porti, Alberto; Prat Gomà, Josep Joan; Sales Zaragozá, Vicente (Optical Society of America, 1999)
Text en actes de congrés
Accés obertWe present a novel, easy, and cost-effective methodology that allows an optical signal supervisory system the detection, isolation, and measurement of the coherent homowavelength crosstalk within an optical node. It also ... -
A study of flexible bandwidth allocation in statistical OFDM-based PON
Cano Valadéz, Iván Nicolás; Escayola Elias, Francisco Javier; Peralta Gallardo, Ángel; Polo Querol, Víctor; Santos Blanco, M. Concepción; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2013)
Text en actes de congrés
Accés restringit per política de l'editorialThe upstream of an OFDM-PON with direct modulated lasers tuned in temperature was experimentally tested. Results demonstrate flexible bandwidth allocation, and show it constitutes an efficient strategy to cope with the ... -
Access services availability and traffic forecast in PON deployment
Segarra Mullerat, Josep; Sales Zaragozá, Vicente; Prat Gomà, Josep Joan (IEEE, 2011)
Text en actes de congrés
Accés restringit per política de l'editorialIn 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 ... -
Agile reconfigurable and traffic adapted all-optical access-metro networks
Segarra Mullerat, Josep; Sales Zaragozá, Vicente; Prat Gomà, Josep Joan (2009)
Text en actes de congrés
Accés restringit per política de l'editorialThe emerging high bandwidth and on-demand user applications require improvements in capacity, configurability and resiliency in next generation optical access networks to incrementally expand on the basis of customers ... -
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)
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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. -
An all-optical carrier recovery scheme for access networks with simple ASK modulation
Schrenk, Bernhard; Bakopoulos, Paraskevas; Kehayas, E.; Maziotis, Alexandros; Lázaro Villa, José Antonio; Avramopoulos, Hércules; Prat Gomà, Josep Joan (IEEE Press. Institute of Electrical and Electronics Engineers, 2011-09)
Article
Accés restringit per política de l'editorialWe theoretically investigate and experimentally demonstrate a scheme for all-optical carrier recovery in loopback access networks that avoids orthogonal or complex modulation formats for the downstream or upstream signals. ... -
An efficient dynamic bandwidth allocation for GPON long-reach extension systems
Sales Zaragozá, Vicente; Segarra Mullerat, Josep; Prat Gomà, Josep Joan (2014-08)
Article
Accés restringit per política de l'editorialLong-Reach (LR) extension is a promising scenario for the future next generation access networks, enabling less Central Offices (COs) in the field and a large number of customers in the access/metro area. Because of the ... -
An improved dynamic wavelength assignment in statistical UDWDM-PONs
Sales Zaragozá, Vicente; Segarra Mullerat, Josep; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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Accés restringit per política de l'editorialDynamic wavelength assignment (DWA) is investigated for managing ultra-dense wavelength division multiplexing-passive optical networks (UDWDM-PONs). The optical network units (ONUs) own lasers under limited thermal tunability ... -
An OFDMA-PON with non-preselected independent ONU sources and centralized feedback wavelength control: Dimensioning and experimental results
Cano Valadéz, Iván Nicolás; Santos Blanco, M. Concepción; Escayola Elias, Francisco Javier; Polo Querol, Víctor; Giacoumidis, E.; Kachris, C.; Tomkos, Ioannis; Prat Gomà, Josep Joan (IEEE, 2012)
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Accés restringit per política de l'editorialA simple and low cost method for wavelength control based on centralized OLT monitoring and feedback of economical random non-preselected independent ONU sources is presented. The technique was dimensioned and experimentally ... -
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)
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Accés restringit per política de l'editorialWe 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 -
Asymmetrical clipping optical filter bank multi-carrier modulation scheme
Ibrahim Mohamed Badr, Asmaa; Prat Gomà, Josep Joan; Ismail, Tawfik (2021-05)
Article
Accés obertFilter bank multi-carrier (FBMC) is considered a promising alternative to the Orthogonal Frequency Division Multiplexing (OFDM) scheme. It improves spectral efficiency by eliminating the need for cyclic prefix while ... -
Bandwidth assignment criteria against rayleigh backscattering effect in TDM-PON single-fibre wavelength-reuse networks
López Pastor, Eduardo Tommy; Lázaro Villa, José Antonio; Polo Querol, Víctor; Prat Gomà, Josep Joan (IEEE, 2011)
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Accés restringit per política de l'editorialIn this paper, theoretical and numerical analysis for Rayleigh Backscattering (RB) in TDM-PON full-duplex single-fiber bidirectional transmission with burst mode upstream and reflective ONU are presented. The results show ... -
Bidirectional coherent PON with ONU based on reused direct-modulated LO
Cano Valadez, Iván Nicolás; Bottoni, Fabio; Velásquez Micolta, Juan Camilo; Presi, Marco; Ciaramella, Ernesto; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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Accés restringit per política de l'editorialWe demonstrate a bidirectional coherent PON based on a direct-modulated upstream signal reused as LO. The proposed system achieves -46/-48 dBm downstream/upstream sensitivity at BER=10-3. -
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 ... -
COCONUT requirements for residential, business and outdoor scenarios
Vall-llosera, Gema; Rafel, Albert; Ciaramella, Ernesto; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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Accés restringit per política de l'editorialFive basic requirements have been defined for the COCONUT ultra-dense WDM PON architecture: (1) untouched optical distribution network, (2) no active components, (3) no intervention in the outside plan, (4) smooth upgrade ... -
Coherent UD-WDM RoF Fronthaul network with D-EML transmitter and phase-noise robust receiver
Masanas Jiménez, Miquel; Tabares Giraldo, Jeison; Prat Gomà, Josep Joan (2021-12-01)
Article
Accés obertThis work proposes and tests a simplified coherent uplink architecture for ultra-dense coherent analog mobile Fronthaul with phase noise cancellation based on single sideband modulation of a dual-EML. Results show optical ... -
Coherent ultra-dense WDM-PON enabled by complexity-reduced digital transceivers
Tabares Giraldo, Jeison; Ghasemi, Saeed; Velásquez Micolta, Juan Camilo; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2020-03-15)
Article
Accés obertCoherent technologies, along with digital signal processing (DSP), have revolutionized optical communication systems, significantly increasing the capacity of the fiber channel owing to transmission of advanced modulation ... -
Colorless FDMA-PON with flexible bandwidth allocation and colorless, low-speed ONUs [invited]
Schindler, Philipp C.; Schmogrow, Rene M.; Dreschmann, Michael; Meyer, Joachim; Tomkos, Ioannis; Prat Gomà, Josep Joan; Krimmel, Heinz-Georg; Pfeiffer, Thomas; Kourtessis, Pandelis; Ludwig, A.; Karnick, D.; Hillerkuss, David; Becker, Juergen; Koos, Christian; Freude, Wolfgang; Leuthold, Juerg (Institute of Electrical and Electronics Engineers (IEEE), 2013-10)
Article
Accés restringit per política de l'editorialWe demonstrate a remotely seeded flexible passive optical network (PON) with multiple low-speed subscribers but only a single optical line terminal transceiver operating at a data rate of 31.25 Gbits/s. The scheme is based ... -
Colorless FSK Demodulation and Detection With Integrated Fabry-Perot-Type SOA/REAM
Schrenk, Bernhard; Lázaro Villa, José Antonio; Kazmierski, Christophe; Prat Gomà, Josep Joan (2010-06-01)
Article
Accés obertA receiver for optical frequency modulated signals, based on colorless demodulation and detection, is presented. An integrated combination of semiconductor optical amplifier (SOA) and reflective electroabsorption modulator ...