Now showing items 1-20 of 168

    • Novel tuneable filter based on MZ and an amplified ring resonator for OFDM networks 

      Vargas, Salvador; Vázquez, Carmen (1999-11-08)
      A novel reconfigurable fibre based tuneable filter is proposed. The module relies on a cascaded connection of Mach-Zehnders and an amplified fibre ring resonator. MHz range adjustable FHWM bandwidths and high crosstalk are ...
    • New optical filter employing multireflection mirror to provide design flexibility for WDMA 

      Vargas, Salvador; Vázquez, Carmen (2000)
      A novel optical device employing an amplified ring resonator and a multireflecting mirror inside, is presented. Is founded its transfer function. Also simple expressions for the separation of the two maximums of this novel ...
    • Design and tolerance analysis of a router with an amplified resonator and Bragg gratings 

      Vargas, Salvador; Vázquez, Carmen; Sánchez Pena, José Manuel (2000-04-20)
      A novel ring resonator configuration with Bragg gratings is presented. The stability of this configuration is studied by a z-transform technique. A router design with a FWHM of 17 MHz, a -40-dB rejection ratio, and a 15-dB ...
    • Novel tunable optical filter employing a fiber loop mirror for synthesis applications in WDM 

      Vargas, Salvador; Vázquez, Carmen; Sánchez Pena, José Manuel (2001-11-12)
      A novel optical filter employing a fiber loop mirror within an amplified ring resonator is presented. The fiber loop mirror allows tuning by changing the coupling factor of a coupler. The device can be used as a building ...
    • Wide tunable filters using a recirculating delay line with multi-reflections 

      Vargas, Salvador; Vázquez, Carmen; Sánchez Pena, José Manuel (2002-05-01)
      A ring resonator with multiple reflections as a tunable filter is proposed and analyzed in this paper. A coupler and two identical Bragg gratings are used to implement the internal reflections so an active filter with a ...
    • Measurements on passive tunable optical filters for DWDM 

      Vázquez, Carmen; Vargas, Salvador; Sánchez Pena, José Manuel; Corredera, Pedro (2002-06-06)
      Measurements on a passive optical fibre tunable filter are presented. The device is based on a loop mirror in a ring resonator. The loop mirror allows tuning by changing the coupling coefficient of a coupler. The novel ...
    • Tunable optical filters using compound ring resonators for DWDM 

      Vargas, Salvador; Vázquez, Carmen; Pena, José Manuel; Corredera, Pedro (2003-07-28)
      The device is based on a loop mirror in a ring resonator. The loop mirror allows tuning by changing the coupling coefficient of a directional coupler. The loop mirror is implemented using a Sagnac configuration to have the ...
    • Optical router for optical fiber sensor networks based on a liquid crystal cell 

      Vargas, Salvador; Sánchez Pena, José Manuel; Vázquez, Carmen; Aranda, Angel; Pérez, Isabel (2003-09-04)
      Optical fiber sensor networks are evolving rapidly. They are used because of the inert nature of optical fibers allowing no electromagnetic interference and safe applications in inflammable atmospheres; other relevant ...
    • Displays and Photonics Application Group Activities 

      Vázquez, Carmen; Sánchez Pena, José Manuel; Vargas, Salvador; Pérez, Isabel; Gonzalo, Ana Belen; montalvo, Julio (2004-06-01)
      Displays and Photonics Application Group (GDAF) is devoted to design and development of passive and active devices and sensors for their applications in WDM networks, CWDM, POF, and RF over fiber networks using different ...
    • A plastic fiber optic liquid level sensor 

      Vargas, Salvador; Vázquez, Carmen; Gonzalo, Ana Belen; Sánchez Pena, José Manuel (2004-06-09)
      A system for measuring liquid level in multiple tanks using optical fiber technology has been developed. Oil field service industry or any sector requiring liquid level measurements in inflammable atmospheres can be benefited ...
    • Demultiplexers for ultranarrow channel spacing based on Mach-Zehnders and ring resonators 

      Vázquez, Carmen; Vargas, Salvador; Sánchez Pena, José Manuel; Gonzalo, Ana Belen (2004-09-01)
      Novel demultiplexer configurations based on concatenated Mach-Zehnders and a ring resonator are presented. These new devices exhibit high channel isolation, flexibility, no loss, and megahertz-adjustable full width at half ...
    • Time Division Multiplexing Fibre-Optic Liquid Level Sensors using a Nematic 1x2 Optical Switch 

      Vázquez, Carmen; Vargas, Salvador; Santos, José Luis; Sánchez Pena, José Manuel; montalvo, Julio (2004-09-01)
      In this paper, time division multiplexing with optical switches in a multi-sensor system for level measurements with POF is reported. POF are used in the sensor heads and as transmission media along the optical network. ...
    • Multi-sensor system using plastic optical fibers for intrinsically safe level measurements 

      Vargas, Salvador; montalvo, Julio; Gonzalo, Ana; Vázquez, Carmen (2004-10-04)
      A system for measuring liquid level in multiple tanks using optical fiber technology has been developed. Oil field service industry or any sector requiring liquid level measurements in flammable atmospheres can be benefited ...
    • Applications of recirculating optical configurations on filters and lasers 

      Vázquez, Carmen; montalvo, Julio; Vargas, Salvador; Corredera, Pedro; Sánchez Pena, José Manuel (2005-07-07)
      In this paper, different optical configurations based on ring resonators and a reflective section in the feedback path, are proposed in order to show the feasibility of their applications in different fields. Additionally, ...
    • Sagnac loop in ring resonators for tunable optical filters 

      Vargas, Salvador; Vázquez, Carmen; Sánchez Pena, José Manuel (2005-08-01)
      General filter architecture using co-and counterpropagation signals are studied. A specific configuration based on a Sagnac loop within a ring resonator is analyzed. Novel tuning, apart from conventional tuning,is achieved ...
    • Efecto del estrés hídrico a distintas temperaturas sobre la germinación de semillas de Bulnesia retama (Gill. ex. Hook.) Griseb. -Zigofiláceas - en San Luis, Argentina 

      Rodríguez Rivera, MF; Sosa, LR; Fernández, EA; Reale, MI; Villarreal, V (2007-07-12)
      Se estudió la germinación de semillas de Bulnesia retama frente a condiciones de estrés hídrico, simulado con PEG6000 a distintas temperaturas, y su recuperación ante el estrés. Las semillas recolectadas en San Luis ...
    • Synthesis of Optical Filters Using Sagnac Interferometer in Ring Resonator 

      Vargas, Salvador; Vázquez, Carmen (2007-11-12)
      We propose a new synthesis method for the implementation of infinite impulse response filters, using a Sagnac interferometer within a ring resonator. This structure permits the synthesis of second-order optical functions ...
    • Towards Simple Interaction in the Classroom: an NFC Approach 

      Nava-Díaz, Salvador W.; Chavira, Gabriel; Hervás, Ramón; Villarreal, Vladimir; Bravo, José (2008)
      In a given environment, distributing different devices with computing capabilities around us opens up new possibilities. It allows simple and easy interaction between user and computer. In this work we propose an approach ...
    • Educación Virtual: Una Visión de Inclusión 

      de Clunie, Gisela T. (2008)
      Cada día crece más el número de personas que presenta dificultad para asistir a un salón de clases presencial, concluir sus estudios o mantenerse actualizado y responder así a las demandas del mercado de trabajo y del ...
    • Towards Simple Interaction in the Classroom: an NFC Approach 

      Nava-Diaz, Salvador; Chavira, Gabriel; Hervas, Ramon; Villarreal, Vladimir; Bravo, Jose (IADIS International Conference e-Learning 2008, 2008-01-01)
      In a given environment, distributing different devices with computing capabilities around us opens up new possibilities. It allows simple and easy interaction between user and computer. In this work we propose an approach ...