Now showing items 1-17 of 17

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

      Bravo Acha, Mikel Upna; Baptista, José Manuel; Santos, José Luís; López-Amo Sáinz, Manuel Upna; 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 ...
    • Application of remote power-by-light switching in a simplified BOTDA sensor network 

      Bravo Acha, Mikel Upna; Zornoza Indart, Ander; Loayssa Lara, Alayn Upna; López-Amo Sáinz, Manuel Upna; 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 ...
    • Concrete beam bending test monitorization using a high strain fiber optic sensor 

      Bravo Acha, Mikel Upna; Sáenz, J.; Bravo Navas, M.; López-Amo Sáinz, Manuel Upna (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 (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 ...
    • Fully switchable multi-wavelength fiber lasers based on random distributed feedback for sensors interrogation 

      Bravo Acha, Mikel Upna; Miguel Soto, Verónica de Upna; Ortigosa Cayetano, Amaia; López-Amo Sáinz, Manuel Upna (IEEE / OSA, 2015)   Artículo / Artikulua  OpenAccess
      In this paper, the experimental study and characterization of a novel real-time switchable multi-wavelength fiber laser has been carried out. Two different gain materials, such as a 50 km SMF and a 2.5 km DCF fibers were ...
    • High resolution polarization-independent highbirefringence fiber loop mirror sensor 

      Leandro González, Daniel Upna; Bravo Acha, Mikel Upna; López-Amo Sáinz, Manuel Upna (Optical Society of America, 2015)   Artículo / Artikulua  OpenAccess
      In this work, two all polarization-maintaining (PM) highbirefringence (Hi-Bi) fiber loop mirrors (FLM) which are immune to external polarization perturbations are validated both theoretically and experimentally. Simplified ...
    • An in-reflection strain sensing head based on a Hi-Bi photonic crystal fiber 

      Rota Rodrigo, Sergio Upna; Rodrigues Pinto, Ana Margarida Upna; Bravo Acha, Mikel Upna; López-Amo Sáinz, Manuel Upna (MDPI, 2013)   Artículo / Artikulua  OpenAccess
      A photonic crystal fiber-based sensing head is proposed for strain measurements. The sensor comprises a Hi-Bi PCF sensing head to measure interferometric signals in-reflection. An experimental background study of ...
    • Internal modulation of a Random fiber laser 

      Bravo Acha, Mikel Upna; Fernández Vallejo, Montserrat Upna; López-Amo Sáinz, Manuel Upna (Optical Society of America, 2013)   Artículo / Artikulua  OpenAccess
      A characterization of a modulated random mirror laser has been experimentally carried out. Unlike conventional internally modulated fiber lasers, no distortion of the modulating frequency or self-mode-locking effects were ...
    • Micro-displacement sensor combined with a fiber ring interrogated by an optical time-domain reflectometer 

      Bravo Acha, Mikel Upna; Baptista, José Manuel; Santos, José Luís; López-Amo Sáinz, Manuel Upna; Frazão, Orlando (IEEE, 2014)   Artículo / Artikulua  OpenAccess
      A micro-displacement sensing head based on two aligned cleaved fibers inserted into an optical fiber ring and interrogated by an OTDR is presented. The sensor configuration is characterized for measuring both longitudinal ...
    • Micro-drilled optical fiber for enhanced laser strain sensors 

      Pérez Herrera, Rosa Ana Upna; Bravo Acha, Mikel Upna; Roldán Varona, Pablo; Leandro González, Daniel Upna; Rodríguez Cobo, L.; López Higuera, José Miguel; López-Amo Sáinz, Manuel Upna (SPIE, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this work, we present an experimental measurement of temperature and strain sensitivities of a micro-drilled optical fiber (MDOF). The MDOF consisted of a quasi-randomly distributed reflector along a single mode fiber ...
    • Multiplexing of six micro-displacement suspended-core Sagnac interferometer sensors with a Raman-Erbium fiber laser 

      Bravo Acha, Mikel Upna; Fernández Vallejo, Montserrat Upna; Echapare Zabaleta, Mikel; López-Amo Sáinz, Manuel Upna; Kobelke, J.; Schuster, K. (Optical Society of America, 2013)   Artículo / Artikulua  OpenAccess
      This work experimentally demonstrates a long-range optical fiber sensing network for the multiplexing of fiber sensors based on photonic crystal fibers. Specifically, six photonic crystal fiber sensors which are based ...
    • Multiplexing optical fiber Fabry-Perot interferometers based on air-microcavities 

      Pérez Herrera, Rosa Ana Upna; Novais, S.; Bravo Acha, Mikel Upna; Leandro González, Daniel Upna; Silva, Susana; Frazão, Orlando; López-Amo Sáinz, Manuel Upna (SPIE, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this work we demonstrate the multiplexing capability of new optical fiber Fabry-Perot interferometers based on airmicrocavities using a commercial FBG interrogator. Three optimized air-microcavity interferometer sensors ...
    • Random fiber lasers: application to fiber optic sensors networks 

      López-Amo Sáinz, Manuel Upna; Leandro González, Daniel Upna; Miguel Soto, Verónica de Upna; Bravo Acha, Mikel Upna; Fernández Vallejo, Montserrat Upna; Pérez Herrera, Rosa Ana Upna (IEEE, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Recently, random mirrors have been proposed as a method to create fiber laser cavities. This kind of cavity is based on cooperative Rayleigh scattering, which is generated along a fiber due to the material inhomogeneities ...
    • Real-time FFT analysis for interferometric sensors multiplexing 

      Leandro González, Daniel Upna; Bravo Acha, Mikel Upna; Ortigosa Cayetano, Amaia; López-Amo Sáinz, Manuel Upna (IEEE / OSA, 2015)   Artículo / Artikulua  OpenAccess
      In this paper, a theoretical and experimental study of two interferometric sensor multiplexing schemes has been carried out by means of the fast Fourier transform (FFT) analysis. This work addresses one of the main drawbacks ...
    • Remote-time division multiplexing of bending sensors using a broadband light source 

      Bravo Acha, Mikel Upna; López-Amo Sáinz, Manuel Upna (Hindawi Publishing Corporation, 2012)   Artículo / Artikulua  OpenAccess
      This work experimentally demonstrates a remote sensing network which interrogates bending sensors using time-division multiplexing techniques and a broadband light source. The bending sensors are located 50 km away from ...
    • Slow-light and enhanced sensitivity in a displacement sensor using a lossy fiber-based ring resonator 

      Bravo Acha, Mikel Upna; Angulo Vinuesa, X.; Martín López, Sonia; López-Amo Sáinz, Manuel Upna; González Herráez, Miguel (IEEE / OSA, 2013)   Artículo / Artikulua  OpenAccess
      Along the last years, much debate has been done on the efficiency of slow-light phenomena in order to enhance lightmatter interactions, especially for sensing purposes. This improvement could be key to develop more compact ...
    • Suspended-core fiber Sagnac combined dual-random mirror Raman fiber laser 

      Rodrigues Pinto, Ana Margarida Upna; Bravo Acha, Mikel Upna; Fernández Vallejo, Montserrat Upna; López-Amo Sáinz, Manuel Upna; Kobelke, J.; Schuster, K. (Optical Society of America, 2011)   Artículo / Artikulua  OpenAccess
      In the present work, a multiwavelength fiber laser based in the combination of a double-random mirror and a suspended-core Sagnac interferometer is presented. The double-random mirror acts by itself as a random laser, ...