Now showing items 1-20 of 110

    • 250 km ultra long remote sensor system based on a fiber loop mirror interrogated by an OTDR 

      Bravo Acha, Mikel Upna Orcid; Baptista, José Manuel; Santos, José Luís; López-Amo Sáinz, Manuel Upna Orcid; Frazão, Orlando (Optical Society of America, 2011)   Artículo / Artikulua  OpenAccess
      A 253 km ultra long remote displacement sensor system based on a fiber loop mirror interrogated by a commercial OTDR is proposed and experimentally demonstrated. The use of a fiber loop mirror increases the signal to noise ...
    • 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 Orcid; Díaz Lucas, Silvia Upna Orcid; Elosúa Aguado, César Upna Orcid; Bariáin Aisa, Cándido Upna Orcid; Loayssa Lara, Alayn Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid (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 ...
    • All-fiber lasers through photonic crystal fibers 

      Rodrigues Pinto, Ana Margarida Upna; López-Amo Sáinz, Manuel Upna Orcid (Science Wise Publishing & De Gruyter, 2013)   Artículo / Artikulua  OpenAccess
      A review on all-fiber lasers based on photonic crystal fibers is presented. Photonic crystal fibers present improved features beyond what conventional optical fibers can offer. Due to their geometric versatility, photonic ...
    • All-PM fiber loop mirror interferometer analysis and simultaneous measurement of temperature and mechanical vibration 

      Leandro González, Daniel Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid (IEEE, 2018)   Artículo / Artikulua  OpenAccess
      In this work, a new all-polarization maintaining (PM) fiber loop mirror interferometer is proposed and validated as temperature and mechanical vibration sensor. The scheme employs the arms of a PM coupler as communication ...
    • Anomalous relative intensity noise transfer in ultralong random fiber lasers 

      Rota Rodrigo, Sergio Upna; Rizzelli, Giuseppe; Leandro González, Daniel Upna Orcid; Nuño, J.; López-Amo Sáinz, Manuel Upna Orcid (Optical Society of America, 2020)   Artículo / Artikulua  OpenAccess
      We present, for the first time, an experimental demonstration of RIN noise transfer dampening at low frequencies in random distributed feedback ultralong Raman fibre lasers based on conventional telecommunication fibres. ...
    • Application of remote power-by-light switching in a simplified BOTDA sensor network 

      Bravo Acha, Mikel Upna Orcid; Zornoza Indart, Ander; Loayssa Lara, Alayn Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid; López Higuera, José Miguel; Ullán Nieto, Ángel (MDPI, 2013)   Artículo / Artikulua  OpenAccess
      We propose and demonstrate the use of spatial multiplexing as a means to reduce the costs of distributed sensing networks. We propose a new scheme in which remote power-by-light switching is deployed to scan multiple ...
    • Compact and highly-efficient polarization independent vertical resonant couplers for active-passive monolithic integration 

      Galarza Galarza, Marko Upna Orcid; Thourhout, Dries Van; Baets, Roel; López-Amo Sáinz, Manuel Upna Orcid (Optical Society of America, 2008)   Artículo / Artikulua  OpenAccess
      Compact low-loss polarization independent vertical coupling between a 1.55 μm InGaAsP bulk active waveguide and a passive waveguide based on bimodal interference is presented. Simulation results show low coupling loss (<0.1 ...
    • Comparative study of ring and random cavities for fiber lasers 

      Fernández Vallejo, Montserrat Upna; Rota Rodrigo, Sergio Upna; López-Amo Sáinz, Manuel Upna Orcid (Optical Society of America, 2014)   Artículo / Artikulua  OpenAccess
      An experimental comparison of three fiber laser structures with the same Raman gain medium is presented in order to establish the main pros and cons of each basic scheme. The first fiber laser is based on a hybrid ring–random ...
    • Comparison between capacitive and microstructured optical fiber soil moisture sensors 

      López Aldaba, Aitor Upna; López Torres, Diego Upna Orcid; Campo-Bescós, Miguel Upna Orcid; López Rodríguez, José Javier Upna Orcid; Yerro Lizarazu, David; Elosúa Aguado, César Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Auguste, Jean-Louis; Jamier, Raphael; Roy, Philippe; López-Amo Sáinz, Manuel Upna Orcid (MDPI, 2018)   Artículo / Artikulua  OpenAccess
      Soil moisture content has always been an important parameter to control because it is a deterministic factor for site-specific irrigation, seeding, transplanting, and compaction detection. In this work, a discrete sensor ...
    • Comparison between different structures of suspended-core microstructured optical fibers for volatiles sensing 

      López Torres, Diego Upna Orcid; López Aldaba, Aitor Upna; Elosúa Aguado, César Upna Orcid; Auguste, Jean-Louis; Jamier, Raphael; Roy, Philippe; López-Amo Sáinz, Manuel Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid (MDPI, 2018)   Artículo / Artikulua  OpenAccess
      In this paper, different core structures of microstructured optical fibers (MOFs) for low-finesse Fabry-Perot (FP) sensors are experimentally compared to get the highest sensitivity. These devices are designed for volatile ...
    • Comparison of wavelength-division-multiplexed distributed fiber Raman amplifier networks for sensors 

      Díaz Lucas, Silvia Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid (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. ...
    • Compound lasing fiber optic ring resonators for sensor sensitivity enhancement 

      Rota Rodrigo, Sergio Upna; González Herráez, Miguel; López-Amo Sáinz, Manuel Upna Orcid (IEEE / OSA, 2015)   Artículo / Artikulua  OpenAccess
      In this work, a new method for increasing simultaneously the sensitivity and interrogation stability of fiberoptic intensity sensors is presented. The configuration is based on a double-coupler ring resonator. On one side, ...
    • Concrete beam bending test monitorization using a high strain fiber optic sensor 

      Bravo Acha, Mikel Upna Orcid; Sáenz, J.; Bravo Navas, M.; López-Amo Sáinz, Manuel Upna Orcid (IEEE / OSA, 2012)   Artículo / Artikulua  OpenAccess
      In this work the development of an 'eight-shape' fiber optic sensor for high strain measurement is experimentally demonstrated. This strain sensor is interrogated using a commercial optical time domain reflectometer through ...
    • Contribution to the development of new photonic systems for fiber optic sensing applications 

      Bravo Acha, Mikel Upna Orcid (2015)   Tesis doctoral / Doktoretza tesia  OpenAccess
      En este trabajo de doctorado se presentan nuevos sistemas y subsistemas de sensores de fibra óptica. Así, se proponen y desarrollan nuevas técnicas, componentes y tecnologías basadas en láseres de fibra con espejos ...
    • Contribution to the development of Rayleigh-based fiber optic systems for sensing applications 

      Miguel Soto, Verónica de Upna Orcid (2019)   Tesis doctoral / Doktoretza tesia  OpenAccess
      La tecnología de los sensores de fibra óptica ha experimentado un gran crecimiento desde sus comienzos en la década de 1970, cuando se contempló su utilización para detectar parámetros tanto físicos como químicos. Además, ...
    • Development of advanced structures for optical fiber lasers and sensors 

      Rota Rodrigo, Sergio Upna (2015)   Tesis doctoral / Doktoretza tesia  OpenAccess
      Desde la irrupción de la fibra óptica en las telecomunicaciones, han surgido multitud de desarrollos basados en sus propiedades. Así, en las últimas décadas, la rápida evolución de los sistemas basados en fibra óptica, así ...
    • Development of new punctual optical fiber transducer for sensing 

      López Aldaba, Aitor Upna (2018)   Tesis doctoral / Doktoretza tesia  OpenAccess
      The international research community has been nurturing photonic technologies over the years, aiming to develop cost effective solutions for a number of applications. Optical fibers offer an efficient solution for sensing ...
    • Dual stage ytterbium doped fiber laser in MOPA configuration 

      Fernández Vallejo, Montserrat Upna; Monelli, D.; Passaro, D.; Cucinotta, A.; Selleri, S.; López-Amo Sáinz, Manuel Upna Orcid (Bentham Open, 2012)   Artículo / Artikulua  OpenAccess
      We report the experimental demonstration of an Ytterbium doped fiber laser (YDFL) composed by two stages in cascade. Two sorts of Ytterbium doped fiber (YDF) with different concentration have been used. A proper characterization ...
    • Dual-wavelength single-longitudinal-mode erbium fiber laser for temperature measurements 

      Díaz Lucas, Silvia Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid (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 ...
    • ECOAL project: delivering solutions for integrated monitoring of coal-related fires supported on optical fiber sensing technology 

      Ribeiro, Joana; Viveiros, Duarte; Ferreira, João; López Gil, Alexia; Domínguez López, Alejandro; Martins, Hugo F.; Pérez Herrera, Rosa Ana Upna Orcid; López Aldaba, Aitor Upna; Duarte, Lia; Rodrigues Pinto, Ana Margarida Upna; Martín López, Sonia; Baierl, Hardy; Jamier, Raphael; Rougier, Sébastien; Auguste, Jean-Louis; Teodoro, Ana Cláudia; Gonçalves, José Alberto; Esteban, Óscar; Santos, José Luís; Roy, Philippe; López-Amo Sáinz, Manuel Upna Orcid; González Herráez, Miguel; Baptista, José Manuel; Flores, Deolinda (MDPI, 2017)   Artículo / Artikulua  OpenAccess
      The combustion of coal wastes resulting from mining is of particular environmental concern, and the importance of proper management involving real-time assessment of their status and identification of probable evolution ...