Ara es mostren els items 30-49 de 57

    • Layer 2 redesign for Metro-Access next generation PON 

      López Pastor, Eduardo Tommy; Polo Querol, Víctor; Lázaro Villa, José Antonio; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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      Necessary modifications and extensions into Layer 2 of the actual PON access are necessary in order to meet new requirements from services providers and users. We propose a flexible Transmission Convergence (TC) Layer ...
    • LUT-Free carrier recovery for intradyne optical DPSK receivers in UDWDM-PON 

      Ghasemi, Saeed; Tabares Giraldo, Jeison; Polo Querol, Víctor; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
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      We present an LUT-free feed-forward carrier recovery architecture in intradyne optical DPSK receivers that reduces ~41% DSP hardware resources and 61% required process clocks with 85% less power consumption in real-time ...
    • LUT-free carrier recovery for intradyne optical DPSK receivers in udWDM-PON 

      Ghasemi, Saeed; Tabares Giraldo, Jeison; Polo Querol, Víctor; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2019-03-15)
      Article
      Accés obert
      We present a lookup table (LUT)-free carrier recovery architecture for intradyne optical DPSK receivers that reduce the required digital signal processing hardware resources, power consumption as well as total process ...
    • Monolithically integrated dual-output DEML for full duplex DPSK-ASK and DPSK-SSB ONU in ultra-dense channel spaced access network 

      Chu, Guangyong; Cano Valadéz, Iván Nicolás; Polo Querol, Víctor; Kazmierski, Christophe; Brenot, Romain; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2016-04)
      Article
      Accés obert
      Ultra-dense access network attracts people's attention recently; however, until now it is difficult to implement it commercially owing to cost, footprint, and the traditional complexity of coherent receiver. Single laser, ...
    • Multilevel direct DFB phase modulation in 6.25 GHz spectrally spaced UDWDM PONs 

      Cano Valadez, Iván Nicolás; Velásquez Micolta, Juan Camilo; Polo Querol, Víctor; Prat Gomà, Josep Joan (2016)
      Presentació
      Accés restringit per política de l'editorial
      Direct phase modulation of DFB is demonstrated with DPSK, DQPSK and Duobinary modulation formats and detected with an intradyne receiver based on a 120-degree hybrid. The system is tested in a 50 km fibre link with 6.25 ...
    • Network dimensioning for a TDM-PON deployment Single-fibre single-wavelength-reuse based on reflective ONUs 

      López Pastor, Eduardo Tommy; Polo Querol, Víctor; Lázaro Villa, José Antonio; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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      The network dimensioning for a TDM-PON deployment based on reflec tive ONUs is presented in order to optimize number of users for efficient exploitation. Due to wavelength reuse, the study is focused on the power budget ...
    • ONU optimal gain and position of the distribution element in Rayleigh-limited WDM and TDM PONs with reflective ONU 

      López Pastor, Eduardo Tommy; Lázaro Villa, José Antonio; Arellano Pinilla, Cristina; Polo Querol, Víctor; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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      The influence of the distribution element position in PONs is reported. Best Crosstalk-to-Signal ratio (C/S) is achieved if it is placed either in the ONU or OLT vicinity with optimum ONU gain depending of the MUX position
    • Optical subsystems for next generation access networks 

      Lázaro Villa, José Antonio; Polo Querol, Víctor; Schrenk, Bernhard; Bonada Bo, Francesc; Cano Valadéz, Iván Nicolás; López Pastor, Eduardo Tommy; Kazmierski, Christophe; de Valicourt, Guilhem; Brenot, Romain; Bauwelinck, Johan; Xing-Zhi, Qiu; Ossieur, P.; Forzati, Marco; Rigole, Jean-Pierre; Monroy, I.T; Tangdiongga, E.; Morant, Maryland; Nicolau, L.; Teixeira, A.L.; Erasme, D.; Klonidis, Dimitrios; Tomkos, Ioannis; Prat Gomà, Josep Joan; Kouloumentas,, Christos; Avramopoulos, Hércules (2011)
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      Recent optical technologies are providing higher flexibility to next generation access networks: on the one hand, providing progressive FTTx and specifically FTTH deployment, progressively shortening the copper access ...
    • Optimal trade-off for a bidirectional single-fibre single-wavelength TDM-PON rSOA-based ONU 

      López Pastor, Eduardo Tommy; Polo Querol, Víctor; Lázaro Villa, José Antonio; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      In this paper, an optimal trade-off between the Optical Distribution Network (ODN) power budget and the upstream optical Signal-to-Rayleigh Ratio (US-oSRR), for a Single- Fibre/Wavelength TDM-PON rSOA-based ONU network ...
    • Optimization of Rayleigh-limited WDM-PONs with reflective ONU by MUX positioning and optimal ONU gain 

      López Pastor, Eduardo Tommy; Lázaro Villa, José Antonio; Arellano Pinilla, Cristina; Polo Querol, Víctor; Prat Gomà, Josep Joan (2010-01)
      Article
      Accés obert
      In this work, the influence of the distribution element position and the reflective optical network unit (ONU) gain in wavelength-division-multiplexing passive optical networks are reported. After the theoretical and ...
    • Optimized differential detection-based optical carrier recovery for intradyne PSK receivers in udWDM-PON 

      Ghasemi, Saeed; Tabares Giraldo, Jeison; Polo Querol, Víctor; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      We present an optical carrier recovery based on differential detection that reduces required DSP hardware resources. Results show -55dBm sensitivity for BER=10-3 and high tolerance against fast LO frequency dithering, with ...
    • Optimizing reflective semiconductor optical amplifier as phase modulator for low cost colorless ONU with 3x3 homodyne detection 

      Chu, Guangyong; Polo Querol, Víctor; Lerín de la Santísima Trinidad, Adolfo; Cano Valadéz, Iván Nicolás; Prat Gomà, Josep Joan (2014)
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      Overcome the limited modulation bandwidth of low cost uncooled To-can packaged RSOA (~400 MHz) and operate it at 3.125 Gb/s using homodyne techniques with the optimal performance for phase modulation via measured characteristics.
    • Polarization independent single-PD coherent ONU receiver with centralized scrambling in udWDM-PONs 

      Cano Valadéz, Iván Nicolás; Lerín de la Santísima Trinidad, Adolfo; Polo Querol, Víctor; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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      A centralized polarization scrambling and single-PD coherent ONU Rx system is proposed and tested with two Tx and direct-phase modulated DFBs. Polarization independence at the Rx, and a sensitivity at BER=10-3 of ×45dBm ...
    • Power efficiency of SARDANA and other long-reach optical acces networks 

      Lovric, Ana; Aleksic, Slavisa; Lázaro Villa, José Antonio; Tosi Beleffi, Giorgio; Prat Gomà, Josep Joan; Polo Querol, Víctor (Institute of Electrical and Electronics Engineers (IEEE), 2011)
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      Different long-reach optical access networks are studied with respect to their power efficiency. Special focus is dedicated to the hybrid TDM/WDM PON proposed in the SARDANA project, in which remote amplification is utilized ...
    • Practical design of a coherent ultra-dense WDM-PON with paired DFB lasers 

      Segarra Mullerat, Josep; Sales Zaragozá, Vicente; Polo Querol, Víctor; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A coherent WDM-PON achieving ultra-dense spectral allocation is reported. The ONU at user premises is built of coherent transceivers with two paired low-cost DFB lasers, one as local oscillator and the other as transmitter, ...
    • Practical fast and non-intrusive ONU activation procedure in coherent udWDM-PON 

      Polo Querol, Víctor; Tabares Giraldo, Santiago; Canals, X; Segarra Mullerat, Josep; Prat Gomà, Josep Joan (2023-04-15)
      Article
      Accés restringit per política de l'editorial
      The development of coherent high density WDM PONs, forecasted as one of the promising technologies to increase the spectral efficiency and reduce the energy consumption, can be obstructedbythe limited tunability, high ...
    • Rayleigh backscattering rejection in single-laser homodyne transceiver for UD-WDM using λ-Shifting 

      Masanas Jiménez, Miquel; Santos Blanco, M. Concepción; Tabares Giraldo, Jeison; Polo Querol, Víctor; Prat Gomà, Josep Joan (2021-04-01)
      Article
      Accés obert
      With the aim of using a single laser per transceiver in single fiber splitter-based passive optical networks (PON) with coherent homodyne receivers, we apply wavelength shifting in an ultra-dense wavelength division ...
    • 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 obert
      A 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 ...
    • Simple single-laser coherent transceiver based on low-cost D-EML for edge networks 

      Masanas Jiménez, Miquel; Polo Querol, Víctor; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2023-03-15)
      Article
      Accés obert
      In this work we demonstrate single-laser, D-EML based coherent transceivers which transmit and simultaneously receive optical single sideband modulations through a phase noise cancelling scheme, leading to phase-noise and ...
    • Simplified carrier recovery for intradyne optical PSK receivers in udWDM-PON 

      Tabares Giraldo, Jeison; Ghasemi, Saeed; Polo Querol, Víctor; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2018-04-28)
      Article
      Accés obert
      We present an optimized carrier recovery architecture based on differential detection for coherent optical receivers that substantially reduces the required DSP hardware resources, aimed at cost-effective transceivers for ...