Now showing items 1-20 of 44

  • 1.25–2.5 Gb/s simple nyquist transmitters for coherent UDWDM-PON with enhanced spectral efficiency 

    Velásquez Micolta, Juan Camilo; Tabares Giraldo, Jeison; Cano Valadez, Iván Nicolás; Prat Gomà, Josep Joan (2018-04-19)
    Article
    Open Access
    We present a coherent ultra-dense wavelength division multiplexing passive optical network (UDWDM-PON) with enhanced spectral efficiency. The benefit of using Gaussian or Nyquist pulse-shaping filters at the transmitter ...
  • 1.25-3.125 Gb/s per user PON with RSOA as phase modulator for statistical wavelength ONU 

    Chu, Guangyong; Polo Querol, Víctor; Lerín de la Santísima Trinidad, Adolfo; Tabares Giraldo, Jeison; Cano Valadéz, Iván Nicolás; Prat Gomà, Josep Joan (2015-12-15)
    Article
    Open Access
    We report a new scheme to support, cost efficiently, ultra-dense wavelength division multiplexing (UDWDM) for optical access networks. As validating experiment, we apply phase modulation of a reflective semiconductor optical ...
  • 1Gbps full-duplex 5GHz frequency slots uDWDM flexible metro/access networks based on VCSEL-RSOA transceiver 

    Altabas, Jose Antonio; Izquierdo, David; Lázaro Villa, José Antonio; Garces, Ignacio (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Conference report
    Restricted access - publisher's policy
    1Gbps full-duplex 5GHz frequency slot is proposed for uDWDM Flexible Metro-Access Networks. The costeffective ONU transceiver is based on VCSEL as LO for coherent reception and seed for phase-modulated RSOA, providing ...
  • 7.5 Gb/s direct DFB phase modulation with 8-DPSK for 6.25 GHz spaced coherent UDWDM-PONs 

    Cano Valadez, Iván Nicolás; Velásquez Micolta, Juan Camilo; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Conference report
    Restricted access - publisher's policy
    We demonstrate an 8-DPSK directly phase-modulated DFB with intradyne detection in a 50 km, 6.25 GHz channel spaced UDWDM-PON. A bit rate of 7.5 Gb/s is achieved with Rx sensitivity of -31 dBm at BER=10-3.
  • Agile reconfigurable and traffic adapted all-optical access-metro networks 

    Segarra Mullerat, Josep; Sales Zaragozá, Vicente; Prat Gomà, Josep Joan (2009)
    Conference report
    Restricted access - publisher's policy
    The 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 ...
  • An approach to the cooperative management of multitechnology networks 

    Díaz, R; Serrat Fernández, Juan; Berdekas, K; Karayannis, F (1999-05)
    Article
    Open Access
    This article presents a TMN-compliant X interface, the so-called Xcoop interface, as a fundamental component of an operations system developed to cope with the challenges of multidomain, multitechnology networks. Defined ...
  • 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)
    Conference report
    Restricted access - publisher's policy
    Dynamic 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 ...
  • Automatic lambda-control with offset compensation in DFB intradyne receiver for udWDM-PON 

    Tabares Giraldo, Jeison; Polo Querol, Víctor; Cano Valadéz, Iván Nicolás; Pratdesaba Fargas, Josep (2015-02-15)
    Article
    Open Access
    A complete automatic wavelength control for digital coherent receivers, which performs local laser tuning and feedforward frequency offset compensation, is presented. We demonstrate the feasibility of the concept in a ...
  • BER improvement using optical gain clamped amplifier for burst transmission and critical cases studies 

    Zannin, Marcelo; Ennser, Karin; Taccheo, Stefano; Careglio, Davide; Solé Pareta, Josep; Aracil Rico, Javier (IEEE Press and Wiley, 2009-03-22)
    Conference report
    Open Access
    This paper demonstrates significant BER improvement in burst traffic transmission using optical-gain clamped amplifiers. Critical chaotic cases are identified for peculiar burst sequences and their impact in transmission ...
  • Cost-effective ROADM architecture for C/DWDM metro-access networks convergence 

    Sarmiento Hernández, Samael; Spadaro, Salvatore; Lázaro Villa, José Antonio (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Conference lecture
    Restricted access - publisher's policy
    The Internet data traffic constant growth caused by the popularization of cloud services, mobile and social networks is requiring changes at the underlying networks in order to enable scalability whereas supporting a highly ...
  • Cross-connection management specialisation for WDM-OTN's 

    Rafel, Albert; Comellas Colomé, Jaume; Junyent Giralt, Gabriel; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2000)
    Conference report
    Open Access
    WDM optical transport networks (WDM-OTN) will use new all-optical nodes that will perform functions in the optical domain, using wavelength as a new network resource. This paper presents a new approach for the optical ...
  • Design of flexible udWDM metro-access network devices assisted by high resolution complex spectroscopy 

    Altabas, Jose Antonio; Izquierdo, David; Pascual, Álvaro; Sarmiento Hernández, Samael; Lázaro Villa, José Antonio; Garces, Ignacio; Villafranca, A. (2016)
    Conference report
    Restricted access - publisher's policy
    The new cloud services, the Internet of Things (IoT) and the convergence of mobile and optical networks in the 5G scenario are pushing up the traffic demand over the metro-access networks. Flexible ultra-dense Wavelength ...
  • Design of green optical networks with signal quality guarantee 

    Cavdar, Cicek; Ruiz Ramírez, Marc; Monti, Paolo; Velasco Esteban, Luis Domingo; Wosinska, Lena (Institute of Electrical and Electronics Engineers (IEEE), 2012)
    Conference report
    Restricted access - publisher's policy
    Energy consumption of communication networks is growing very fast due to the rapidly increasing traffic demand. Consequently, design of green communication networks gained a lot of attention. In this paper we focus on ...
  • Digital Nyquist WDM for access networks using limited bandwidth reflective semiconductor optical amplifiers 

    Lázaro Villa, José Antonio; Knorr, Sebastian; Bernhard, Schrenk; Cano Valadéz, Iván Nicolás; Polo Querol, Víctor; Prat Gomà, Josep Joan; Carena, Andrea; Bosco, Gabriella (Institute of Electrical and Electronics Engineers (IEEE), 2012)
    Conference report
    Restricted access - publisher's policy
    Digital Nyquist-WDM is experimentally demonstrated using RSOA-based colorless ONUs, providing a 6-fold enhancement of transmission capacity through 25km fiber, and showing digital Nyquist-WDM as promising candidate for ...
  • Direct phase modulation for UDWDM ONU with beat signals 

    Velásquez Micolta, Juan Camilo; Cano Valadez, Iván Nicolás; Tabares Giraldo, Jeison; Polo Querol, Víctor; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2018)
    Conference report
    Restricted access - publisher's policy
    An ONU transmitter for UDWDM PONs based on direct phase modulated distributed feedback lasers (DFB) through digital beat signals is proposed and experimentally tested. The amplitude and duty cycle of the modulating signal ...
  • Diseño de topologías lógicas sobre redes ópticas WDM sin convertidores de longitud de onda 

    Roig Jiménez, Óscar (Universitat Politècnica de Catalunya, 2005-01)
    Master thesis (pre-Bologna period)
    Restricted access - author's decision
    El diseño de una topología lógica consiste en definir enlaces lógicos entre los nodos de una red física y asignar las longitudes de onda disponibles, las rutas físicas y el volumen de tráfico de cada canal. DTL es un ...
  • Disseny i implementació de mecanismes del pla de control en un prototipus de xarxa OBS 

    Fernández Molina, Pablo (Universitat Politècnica de Catalunya, 2011-05-26)
    Bachelor thesis
    Open Access
    L’objectiu principal plantejat en aquest projecte ha estat optimitzar el pla de control d’un prototipus de xarxa de Commutació de Ràfegues Òptiques (OBS, Optical Burst Switching) del qual ja se'n disposava d'un disseny ...
  • Effective amplification of real WDM burst traffic using optical gain clamping 

    Zannin, Marcelo; Taccheo, Stefano; Ennser, Karin; Careglio, Davide; Solé Pareta, Josep (2008-05-04)
    Conference report
    Open Access
    Experimental studies of real optical burst traffic in WDM systems are performed with optical gain clamping for stabilizing the EDFA amplification. Impairments of power variation due to burst are shown to be negligible.
  • Energy-oriented models for WDM networks 

    Ricciardi, Sergio; Careglio, Davide; Palmieri, Francesco; Fiore, Ugo; Santos Boada, Germán; Solé Pareta, Josep (2010)
    Conference report
    Open Access
    A realistic energy-oriented model is necessary to formally characterize the energy consumption and the consequent carbon footprint of actual and future high-capacity WDM networks. The energy model describes the energy ...
  • Evaluating the energy efficiency of DWA algorithms in UDWDM-PONs 

    Segarra Mullerat, Josep; Sales Zaragozá, Vicente; Polo Querol, Víctor; Prat Gomà, Josep Joan (2016)
    Conference report
    Restricted access - publisher's policy
    Ultra-Dense Wavelength Division Multiplexing (UDWDM) has been proposed for the optical access Passive Optical Network (PON) in the COst-effective COhereNt Ultra-dense-WDM-PON for lambda-To-the-user access (COCONUT) ...