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Ara es mostren els items 87-106 de 141

    • Minimum channel spacing in an ofdm cpfsk optical coherent system 

      Prat Gomà, Josep Joan; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (1998-03)
      Article
      Accés restringit per política de l'editorial
      Channel spacing in optical frequency-division multiplexed (OFDM) coherent optical systems with continuous-phase frequency-shift-keying (CPFSK) is obtained both theoretically and experimentally. The bit error ratio is derived ...

    • Modified duobinary polarization-shift keying transmission scheme 

      Gené Bernaus, Joan M.; Soler Rocasalbas, Marçal; Contreras Leyva, Miguel A.; Comellas Colomé, Jaume; Prat Gomà, Josep Joan (2003)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      A new version of duobinary polarization-shift keying scheme is proposed. The relocation of the duobinary filter at the receiver side and the optimization of both transmitter and receiver electrical filters offer a receiver ...

    • 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)
      Text en actes de congrés
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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 ...

    • OFDM-PON performance with limited quantization 

      Escayola Elias, Francisco Javier; Cano Valadéz, Iván Nicolás; Santos Blanco, M. Concepción; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
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      A study of digital-analogue converter quantization effects and the minimum resolution required in an OFDMA-PON is carried out with 10 Gbps transceivers. The PON is based on DD over a maximum of 100 km fibre length. Results ...

    • On an ONU for full-duplex 10.5 Gbps/lambda with shared delay interferometer for format conversion and chirp filtering 

      Schrenk, Bernhard; Stamatiadis, C.; Lazarou, I.; Maziotis, Alexandros; de Valicourt, Guilhem; Lázaro Villa, José Antonio; Prat Gomà, Josep Joan; Avramopoulos, Hércules (2011)
      Text en actes de congrés
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      Chirped IRZ downstream is used together with a delay interferometer and a RSOA at a low complexity ONU for full-duplex 10.5Gbps transmission on a single wavelength, supported by modulation format conversion and optical ...

    • 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)
      Text en actes de congrés
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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)
      Text en actes de congrés
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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)
      Text en actes de congrés
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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)
      Text en actes de congrés
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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)
      Text en actes de congrés
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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.

    • Optimum carrier to signal power ratio for remote heterodyne DD-OFDM in PONs 

      Cano Valadéz, Iván Nicolás; Santos Blanco, M. Concepción; Prat Gomà, Josep Joan (2013-07)
      Article
      Accés restringit per política de l'editorial
      The carrier to signal power ratio (CSPR) in a directdetection optical orthogonal frequency division multiplexing (OFDM) system based on remote heterodyne scheme is optimized in a passive optical network (PON) downlink. ...

    • Performance monitor for all-optical networks based on homodyne spectroscopy 

      Amrani, A.; Junyent Giralt, Gabriel; Prat Gomà, Josep Joan; Comellas Colomé, Jaume; Ramdani, I.; Sales Zaragozá, Vicente; Rafel, A. (2000-11)
      Article
      Accés obert
      The ability to transparently detect performance degradations in all-optical networks is highly desirable. We present an optical signal monitor, based on a frequency supervision system, which can participate in some tasks ...

    • Physical layer evaluation of OFDM-based access networks 

      Cano Valadéz, Iván Nicolás; Santos Blanco, M. Concepción; Prat Gomà, Josep Joan; Krimmel, H.G.; Kavatzikidis, T.; Giacoumidis, E.; Tomkos, Ioannis (IEEE Press. Institute of Electrical and Electronics Engineers, 2011)
      Text en actes de congrés
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      In this paper, we present a physical layer parameter optimization of direct-detection optical OFDM techniques at bitrates of 10 Gb/s and 40 Gb/s using an intensity modulation and two types of field modulation transmitte ...

    • Planning and designing FTTH networks: elements, tools and practical issues 

      Segarra Mullerat, Josep; Sales Zaragozá, Vicente; Prat Gomà, Josep Joan (IEEE, 2012)
      Text en actes de congrés
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      Fiber-To-The Home (FTTH) provides the offered and new broadband services. Now it is deployed massively worldwide with Passive Optical Networks (PONs), being the EPON and GPON standards the most used. In this paper we ...

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