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Ara es mostren els items 60-79 de 141

    • Fast wavelength thermal tuning of DFB lasers for ultra dense WDM-PONs 

      Tabares Giraldo, Santiago; Polo Querol, Víctor; Prat Gomà, Josep Joan (2022-10-15)
      Article
      Accés obert
      Thermal tunability for distributed feedback lasers is generally done at slow tuning speed. We study laser current boosting and implement a pre-equalization stage for short wavelength jump, improving the tuning time to the ...

    • Field-Trial of a high-budget, filterless, lambda-to-the-user, UDWDM-PON enabled by an innovative class of low-cost coherent transceivers 

      Presi, Marco; Artiglia, Massimo; Bottoni, Fabio; Cano Valadez, Iván Nicolás; Tabares Giraldo, Jeison; Velásquez Micolta, Juan Camilo; Ghasemi, Saeed; Polo Querol, Víctor; Chu Guang, Yong; Prat Gomà, Josep Joan (2017-09-01)
      Article
      Accés obert
      We experimentally demonstrate an innovative ultradense wavelength division multiplexing (UDWDM) passive optical networks (PON) that implements the full ¿-to-the-user concept in a filterless distribution network. Key element ...

    • First demonstration and field trial on multi-user UDWDM-PON full duplex PSK-PSK with single monolithic integrated dual-output-DFB-SOA based ONUs 

      Chu, Guang Yong; Maho, Anaelle; Cano Valadez, Iván Nicolás; Polo Querol, Víctor; Brenot, Romain; Debregeas, Helene; Prat Gomà, Josep Joan (2016-10-15)
      Article
      Accés obert
      We demonstrate a monolithically integrated dual-output DFB-SOA, and conduct the field trial on a multi-user bidirectional coherent ultradense wavelength division multiplexing-passive optical network (UDWDM-PON). To the ...

    • Flexible coherent UDWDM-PON adapting dynamically to different bandwidths 

      Segarra Mullerat, Josep; Sales Zaragozá, Vicente; Prat Gomà, Josep Joan; Kazovsky, Leonid (2017)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Ultra-Dense Wavelength Division Multiplexing (UDWDM) is a candidate for future Passive Optical Networks (PONs) to sustain the increase of access traffic, providing enhanced capacity with point-to-point logical connections ...

    • Flexible coherent UDWDM-PON with dynamic user allocation based on limited-tunability lasers 

      Segarra Mullerat, Josep; Sales Zaragozá, Vicente; Polo Querol, Víctor; Tabares Giraldo, Jeison; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2020-09-01)
      Article
      Accés obert
      Coherent wavelength division multiplexing (WDM) technologies have leveraged the optical communication systems in core networks, increasing the fiber capacity by transmission with advanced modulation formats and mitigation ...

    • Flexible mobile fronthaul with coherent UDWDM-PON 

      Segarra Mullerat, Josep; Sales Zaragozá, Vicente; Prat Gomà, Josep Joan (2018)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Ultra Dense Wavelength Division Multiplexing (UDWDM) has been proposed for future Passive Optical Networks (PONs) to support the increase of access traffic, furnishing an improved capacity while introducing point-to-point ...

    • Flexible WDM-PON with Nyquist-FDM and 31.25 Gbit/s per wavelength channel using colorless, low-speed ONUs 

      Schindler, Philipp C.; Schmogrow, Rene M.; Dreschmann, Michael; Meyer, Joachim; Hillerkuss, David; Tomkos, Ioannis; Prat Gomà, Josep Joan; Krimmel, Heinz-Georg; Pfeiffer, Thomas; Kourtessis, Pandelis; Becker, Juergen; Koos, Christian; Freude, Wolfgang; Leuthold, Juerg (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A remotely seeded flexible WDM network solution with 31.25 Gbit/s based on Nyquist sinc-pulses is demonstrated. The low-speed, colorless ONUs use remote heterodyne detection with electrical up- and down-conversion and SOAs ...

    • Fortistis: Split extension in dense passive optical networks by inline amplification with remote ASE-shaped pump delivery via colorless optical network units 

      Schrenk, Bernhard; Bonada Bo, Francesc; Lázaro Villa, José Antonio; Prat Gomà, Josep Joan (2010)
      Text en actes de congrés
      Accés obert
      A method for extending the customer density via ASE-pumped splitters in the tree in a WDM/TDM-PON is presented. The influence of Rayleigh backscattering in the feeder is faced, originally prohibiting any upstream transmission.

    • FSK plus ASK/ASK operation for optical 20/10 gbps access networks with simple reflective user terminals 

      Schrenk, Bernhard; de Valicourt, Guilhem; Lázaro Villa, José Antonio; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Doubling of the downstream rate by reusing the reflective upstream modulator is demonstrated. With just two photo-detectors, a RSOA and a power splitter at the ONU, a 20/10 Gbps mode can be provided per wavelength.

    • Full-duplex 20/10 Gb/s WDM-PON with remodulation of chirped ASK and multi-level quaternary PAM and OFDM 

      Lázaro Villa, José Antonio; Bernhard, Schrenk; Maziotis, Alexandros; Cano Valadéz, Iván Nicolás; Bakopoulos, Paraskevas; Prat Gomà, Josep Joan; Avramopoulos, Hércules (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A full-duplex 20/10Gb/s WDM-PON is demonstrated by all-optical carrier recovery technique, showing that it is efficient and flexible for being applied to different downstream signals as non-/chirped ASK or multilevel signals ...

    • GPON redundancy eraser algorithm for long-reach extension 

      Segarra Mullerat, Josep; Sales Zaragozá, Vicente; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Long-Reach (LR) extension is a promising scheme for 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 large ...

    • GPON scheduling disciplines under multi-service bursty traffic and long-reach approach 

      Segarra Mullerat, Josep; Sales Zaragozá, Vicente; Prat Gomà, Josep Joan (2010)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Gigabit-capable PON (GPON) is the optical access standard being deployed by many incumbent operators, but the Dynamic Bandwidth Allocation (DBA) algorithm for multi-service Quality of Service (QoS) is not specified; hence, ...

    • GPON unbundling for multioperator access 

      Carmona, David; Prat Gomà, Josep Joan; Tomkos, Ioannis; PILAR, SANCHEZ MARCO (Institute of Electrical and Electronics Engineers (IEEE), 2010)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This work aims at considering different unbundling options for the Local Loop Unbundling (LLU) in order to provide multi-operator access and consider the economical impact for the FTTH NGA entrants to deploy such alternatives. ...

    • GPON unbundling for multioperator access 

      Carmona Torondell, David; Prat Gomà, Josep Joan; Sánchez Marco, Mª Pilar (Rama de estudiantes del IEEE de Barcelona, 2013-05)
      Article
      Accés obert
      Nowadays, incumbent operators are deploying GPON FTTH access network over substantial part of the countries in Europe, in a Point-to-Multipoint architecture (P2MP). This architecture is characterized by a shared fiber ...

    • Grade of service in UDWDM-PON with statistical wavelength subscribing 

      Segarra Mullerat, Josep; Sales Zaragozá, Vicente; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The Grade of Service (GoS) or ONU rejection probability in coherent UDWDM-PONs with ONU lasers under limited tunability is evaluated. Each active ONU is assigned an exclusive wavelength channel, which is managed by heuristic ...

    • Half-duplex transmission avoiding rayleigh backscattering crosstalk in UDWDM-PON with coherent receivers 

      Segarra Mullerat, Josep; Sales Zaragozá, Vicente; Polo Querol, Víctor; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Text en actes de congrés
      Accés obert
      Ultra Dense Wavelength Division Multiplexing (UDWDM) is a promising technique for access PON, introducing the wavelength-to-the-user concept. The key enabling technology will be a new cost-effective coherent detection ...

    • Hitless dynamic wavelength allocation in coherent WDM-PONs 

      Presi, Marco; Rannello, M.; Artiglia, Massimo; Tomkos, Ioannis; Cano Valadez, Iván Nicolás; Prat Gomà, Josep Joan; Ciaramella, Ernesto (2016)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      We introduce a novel algorithm for real-time ONU activation (¿ - assignment) and reconfiguration (¿ - tuning) in WDM coherent PONs. The algorithm prevents service interruption of lighted channels and it is experimentally ...

    • Hitless wavelength assignment in filterless optical access networks 

      Presi, Marco; Rannello, M.; Artiglia, Massimo; Tomkos, Ioannis; Cano Valadez, Iván Nicolás; Prat Gomà, Josep Joan; Ciaramella, Ernesto (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Text en actes de congrés
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      Advantages offered by coherent detection systems in access networks are not limited to the increase of power budget due to the superior sensitivity. Channel selectivity is another intriguing feature offered by coherent systems ...

    • L-Band In-Line Remote Amplification for an Extended WDM/PON Ring Architecture 

      Chatzi, Sotiria; Tomkos, Ioannis; Lázaro Villa, José Antonio; Prat Gomà, Josep Joan (IEEE Press. Institute of Electrical and Electronics Engineers, 2009-06-28)
      Text en actes de congrés
      Accés obert
      In this paper, a study on a fully passive WDM/PON ring architecture which reaches 19 km distance, while serving more than 1000 users with symmetric several hundred Mbit/s per user is presented. The design is based on ...

    • Laser linewidth requirements for remote heterodyne OFDM based PON scenario 

      Escayola Elias, Francisco Javier; Cano Valadéz, Iván Nicolás; Santos Blanco, M. Concepción; Prat Gomà, Josep Joan (IEEE Press and Wiley, 2004)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The relationship between the FFT size, modulation format and laser linewidth is studied in a remote heterodyne scenario where phase noise is compensated by pilot tones. Results indicate that the laser linewidth tolerance ...