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Ara es mostren els items 108-127 de 141

    • Quaternary optical transmission system combining phase and polarization shift keying 

      Comellas Colomé, Jaume; Gené Bernaus, Joan M.; Prat Gomà, Josep Joan (2004-07)
      Article
      Accés obert
      A new optical transmission scheme which combines polarization-shift keying and differential phase-shift keying on the same optical carrier is proposed. Simulations carried out show a considerable tolerance toward different ...

    • Radio-over-fiber optical polarization-multiplexed networks for 3GPP wireless carrier-aggregated MIMO provision 

      Morant Pérez, María; Prat Gomà, Josep Joan; Llorente Sáez, Roberto (2014-10-15)
      Article
      Accés restringit per política de l'editorial
      This paper proposes and demonstrates experimentally the application of optical polarization-multiplexed radio-over-fiber wireless backhauling of fully standard 3GPP carrier-aggregated multiple-input multiple-output (MIMO) ...

    • 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 ...

    • Real-time coherent ONU for ¿-to-the-user based on fully analogue processing of OOK signals 

      Bottoni, Fqabio; Presi, Marco; Artiglia, Massimo; Prat Gomà, Josep Joan; Ciaramella, Ernesto (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Using fully-analogue and commercially available electronics, we realize a real-time coherent ONU receiver for Ultra-Dense WDM-PON based on intensity-modulated signals. The receiver also requires common photonic components ...

    • Receptor optico coherente (pfsk a 2.5 gb/s) 

      Prat Gomà, Josep Joan; Roldán Andrade, Jesús; Junyent Giralt, Gabriel (1991)
      Text en actes de congrés
      Accés obert
      This paper concers the design and present results of a CPFSK optical receiver for a 2.5 Gbit/s coherent system operating at 1.55 ¡.¡m. The received CPFSK modulated signal is converted into the electrical domain by means ...

    • Reduction of the tuning time of 1.5-µm three-section DBR lasers by controlling the transient currents 

      de Sousa, Ana Belén; Prat Gomà, Josep Joan; Gené Bernaus, Joan M. (2000)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A dynamical simulation model for three-section DBR laser is extended to analyse the thermal effect under continuous tuning. A new method to compensate the thermal drifts is implemented, and we have simulated a nonintrusive ...

    • Resource allocation and interference management techniques for OFDM-based VLC atto-cells 

      Ibrahim Mohamed Badr, Asmaa; Ismail, Tawfik; Elsayed, Khaled F.; Darweesh, Mohamed Saeed; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2020-07-13)
      Article
      Accés obert
      In this paper, a resource partitioning scheme combined with a new multi-carrier optical modulation technique for indoor visible light communication (VLC) system is proposed. In VLC systems, the coverage area is divided ...

    • Resultados funcionales del prototipo de un Sistema de comunicación óptica coherente por fibra óptica a alta velocidad 

      Prat Gomà, Josep Joan; Junyent Giralt, Gabriel; Roldán Andrade, Jesús (1992)
      Text en actes de congrés
      Accés obert

    • SARDANA: an all-optical access-metro WDM/TDM-PON 

      Spirou, S.; Tomkos, Ioannis; Prat Gomà, Josep Joan; Segarra Mullerat, Josep; Sales Zaragozá, Vicente; Lázaro Villa, José Antonio; Chanclou, Philippe; Soila, Risto; Teixeira, A.; Tosi Beleffi, Giorgio M. (2011)
      Text en actes de congrés
      Accés obert
      A new optical access network, named “Scalable Advanced Ring-based passive Dense Access Network Architecture” (SARDANA), is presented. It transparently integrates WDM metro and TDM PON access technologies, implementing ...

    • 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 ...

    • Simplified polarization diversity heterodyne receiver for 1.25Gb/s cost-effective udWDM-PON 

      Cano Valadéz, Iván Nicolás; Lerín de la Santísima Trinidad, Adolfo; Polo Querol, Víctor; Prat Gomà, Josep Joan (2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      We propose a heterodyne receiver with a single-photodiode per polarization for ONU receiver in low-cost udWDM-PON. This grants polarization diversity operation showing a penalty of 6dB in sensitivity compared to a balanced ...

    • Simultaneous DPSK-ASK modulated dual-EML transmitter for coherent UDWDM-PON 

      Velásquez Micolta, Juan Camilo; Domingo, Marc; Polo Querol, Víctor; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      An integrated dual-EML is modulated to obtain a simultaneous DPSK/ASK signal. Rx sensitivity of -40 dBm at BER=10-3 was achieved at 5Gb/s with simple heterodyne detection.

    • Single sideband techniques for next generation low-cost UD-WDM coherent PONs 

      Masanas Jiménez, Miquel; Polo Querol, Víctor; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2022)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Two applications for splitter-based, coherent passive optical networks are investigated. Coherent technologies enable ultra-dense wavelength division multiplexing, increasing the dedicated data rates per application, the ...

    • Sistema de ecualización con realimentación cuantizada para sistemas ópticos coherentes CPFSK de banda ancha 

      Prat Gomà, Josep Joan; Cerdà, P.; Roldán Andrade, Jesús; Junyent Giralt, Gabriel (1990)
      Text en actes de congrés
      Accés obert

    • 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)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Simultaneous 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 ...

    • Square root module to combat dispersion-induced nonlinear distortion in Radio-over-Fiber Systems 

      Prat Gomà, Josep Joan; Santos Blanco, M. Concepción; Omella Cáncer, Mireia Esther (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-09-15)
      Article
      Accés obert
      Reduced dispersion-induced harmonics levels are reported for analogue radio-over-fiber systems by using a linearized receiver incorporating a memoryless electronic circuit with square root (SQRT)-like transfer function, ...

    • Square-root strategy: a novel method to linearize an optical communication system with electronic equalizers 

      Prat Gomà, Josep Joan; Napoli, Antonio; Gené Bernaus, Joan M.; Omella Cáncer, Mireia Esther; Poggiolini, P.; Curri, Vittorio (2005)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      We demonstrate a nonlinear function after the photodetector that linearizes dispersion-limited IM-DD systems, enhancing the performance of linear electronic equalization. Results showed a clear improvement in terms of ...

    • Statistical UDWDM-PONs operating with ONU lasers under limited tunability 

      Sales Zaragozá, Vicente; Segarra Mullerat, Josep; Polo Querol, Víctor; Prat Gomà, Josep Joan (2015-02-01)
      Article
      Accés obert
      We explore a new wavelength management for ultradense wavelength division multiplexing- passive optical network with randomly distributed optical network unit (ONU) wavelengths, controlled with limited thermal tunability. ...