Now showing items 1-15 of 15

    • 46-km-long Raman amplified hybrid double-bus network with point and distributed Brillouin sensors 

      Fernández Vallejo, Montserrat Upna; Olier Aguado, David; Zornoza Indart, Ander; Pérez Herrera, Rosa Ana Upna; Díaz Lucas, Silvia Upna; Elosúa Aguado, César Upna; Bariáin Aisa, Cándido Upna; Loayssa Lara, Alayn Upna; López-Amo Sáinz, Manuel Upna (IEEE, 2012)   Artículo / Artikulua  OpenAccess
      We experimentally demonstrate a 46-km hybrid network that combine point and distributed Brillouin sensors. The proposed sensor network multiplexes low-cost intensity point sensors based on fiber-optic tapers, which are ...
    • Comparison of wavelength-division-multiplexed distributed fiber Raman amplifier networks for sensors 

      Díaz Lucas, Silvia Upna; López-Amo Sáinz, Manuel Upna (Optical Society of America, 2006)   Artículo / Artikulua  OpenAccess
      A novel distributed fiber Raman amplified star topology used for optical sensor wavelength-division multiplexing is proposed. The performance of this star configuration is compared to an optically amplified bus topology. ...
    • Dual-wavelength single-longitudinal-mode erbium fiber laser for temperature measurements 

      Díaz Lucas, Silvia Upna; López-Amo Sáinz, Manuel Upna (SPIE, 2014)   Artículo / Artikulua  OpenAccess
      A dual-wavelength erbium fiber laser with single-longitudinal-mode characteristic is proposed and demonstrated. The system uses a 7-m-long highly doped erbium-doped fiber as the primary gain medium while two fiber Bragg ...
    • Fiber-based early diagnosis of venous thromboembolic disease by label-free D-dimer detection 

      Zubiate Orzanco, Pablo Upna; Urrutia Azcona, Aitor Upna; Ruiz Zamarreño, Carlos Upna; Egea Urra, Josune; Fernández Irigoyen, Joaquín; Giannetti, Ambra; Baldini, Francesco; Díaz Lucas, Silvia Upna; Matías Maestro, Ignacio Upna; Arregui San Martín, Francisco Javier Upna; Santamaría, Enrique; Chiavaioli, Francesco; Del Villar, Ignacio Upna (Elsevier, 2019)   Artículo / Artikulua  OpenAccess
      D-dimer is a useful diagnostic biomarker for deep vein thrombosis or pulmonary embolism, collectively referred to as venous thromboembolism (VTE). The ability to detect in real-time the amount of D-dimer with a fast and ...
    • Gaze estimation: a mathematical challenge 

      Sesma Sánchez, Laura Upna (2017)   Tesis doctoral / Doktoretza tesia  OpenAccess
      El interés en los sistemas de eye tracking está creciendo significativamente en la actualidad. Aunque la tecnología de eye tracking puede parecer nueva, el estudio del movimiento del ojo ya empezó a principios del siglo ...
    • Long-range hybrid network with point and distributed Brillouin sensors using Raman amplification 

      Zornoza Indart, Ander; Pérez Herrera, Rosa Ana Upna; Elosúa Aguado, César Upna; Díaz Lucas, Silvia Upna; Bariáin Aisa, Cándido Upna; Loayssa Lara, Alayn Upna; López-Amo Sáinz, Manuel Upna (Optical Society of America, 2010)   Artículo / Artikulua  OpenAccess
      We propose a novel concept for hybrid networks that combine point and distributed Brillouin sensors in a cost-effective architecture that also deploys remote distributed Raman amplification to extend the sensing range. A ...
    • Monitoring the etching process in LPFGs towards development of highly sensitive sensors 

      Del Villar, Ignacio Upna; Cruz, José Luis; Socorro Leránoz, Abián Bentor Upna; Díaz Lucas, Silvia Upna; Corres Sanz, Jesús María Upna; Arregui San Martín, Francisco Javier Upna; Matías Maestro, Ignacio Upna (MDPI, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this work, the monitoring of the etching process up to a diameter of 30 µm of two LPFG structures has been compared, one of them had initially 125 µm, whereas the second one had 80 µm. By tracking the wavelength shift ...
    • Multimode – coreless – multimode fiber-based sensors: theoretical and experimental study 

      San Fabián García, Noé Upna; Socorro Leránoz, Abián Bentor Upna; Del Villar, Ignacio Upna; Díaz Lucas, Silvia Upna; Matías Maestro, Ignacio Upna (IEEE, 2019)   Artículo / Artikulua  OpenAccess
      This paper presents a complete study on the spectral behavior of a multimode-coreless-multimode fiber-optic structure, as well as its application as a refractometer and a liquid level sensor. The combination of two standard ...
    • New multiplexing structures for fiber optic sensors 

      Leandro González, Daniel Upna (2016)   Tesis doctoral / Doktoretza tesia  OpenAccess
      El campo de la fibra óptica ha sufrido una rápida evolución durante las últimas décadas debido a sus buenas prestaciones en aplicaciones de telecomunicaciones. Aprovechando este avance científico y técnico en componentes ...
    • Optical fiber bus protection network to multiplex sensors: experimental validation of self-diagnosis 

      Pérez Herrera, Rosa Ana Upna; Urquhart, Paul; Schlüter, Marcel; Díaz Lucas, Silvia Upna; López-Amo Sáinz, Manuel Upna (IEEE, 2012)   Artículo / Artikulua  OpenAccess
      The experimental demonstration of a resilient wavelength division multiplexed (WDM) fiber bus network to interconnect sensors is reported. The network recovers operation after failures and it performs 'self-diagnosis', the ...
    • Resilient amplified double ring optical networks to multiplex optical fibre sensors 

      Fernández Vallejo, Montserrat Upna; Pérez Herrera, Rosa Ana Upna; Elosúa Aguado, César Upna; Díaz Lucas, Silvia Upna; Urquhart, Paul; Bariáin Aisa, Cándido Upna; López-Amo Sáinz, Manuel Upna (IEEE / OSA, 2009)   Artículo / Artikulua  OpenAccess
      We report the experimental demonstration of two configurations of an amplified optical fibre double ring network for the multiplexing of sensors. The networks are designed to be inherently resilient to fibre failures because ...
    • Sensitivity enhancement in low cutoff wavelength long-period fiber gratings by cladding diameter reduction 

      Del Villar, Ignacio Upna; Partridge, Matthew; Rodríguez, Wenceslao; Fuentes Lorenzo, Omar Upna; Socorro Leránoz, Abián Bentor Upna; Díaz Lucas, Silvia Upna; Corres Sanz, Jesús María Upna; James, Stephen; Tatam, Ralph (MDPI, 2017)   Artículo / Artikulua  OpenAccess
      The diameter of long-period fiber gratings (LPFGs) fabricated in optical fibers with a low cutoff wavelength was be reduced by hydrofluoric acid etching, enhancing the sensitivity to refractive index by more than a factor ...
    • Stable multi-wavelength erbium fiber ring laser with optical feedback for remote sensing 

      Díaz Lucas, Silvia Upna; Leandro González, Daniel Upna; López-Amo Sáinz, Manuel Upna (IEEE / OSA, 2015)   Artículo / Artikulua  OpenAccess
      In this work, we demonstrate a stable fiber sensing system for remote temperature measurements, where the sensing element is an array of four fiber Bragg gratings (FBGs) and sensor interrogation is achieved with a ...
    • Temperature sensor using a multiwavelength erbium-doped fiber ring laser 

      Díaz Lucas, Silvia Upna; San Fabián García, Noé Upna; Socorro Leránoz, Abián Bentor Upna; Matías Maestro, Ignacio Upna (Hindawi, 2017)   Artículo / Artikulua  OpenAccess
      A novel temperature sensor is presented based on a multiwavelength erbium-doped fiber ring laser.The laser is comprised of fiber Bragg grating reflectors as the oscillation wavelength selecting filters.The performance of ...
    • WDM bi-directional transmission over 35 km amplified fiber-optic bus network using Raman amplification for optical sensors 

      Díaz Lucas, Silvia Upna; Lasheras, Gorka; López-Amo Sáinz, Manuel Upna (Optical Society of America, 2005)   Artículo / Artikulua  OpenAccess
      We demonstrate a novel distributed fiber Raman amplified bus topology used for WDM transmission over 35 km of single-mode fiber by use of a multiwavelength Raman pump laser and eight Fiber Bragg gratings (FBGs). This ...