• Second-order nonlocal effects mitigation in Brillouin optical time-domain analysis sensors by tracking the Brillouin frequency shift profile of the fiber 

      Mompó Roselló, Juan José Upna; Iribas Pardo, Haritz Upna Orcid; Urricelqui Polvorinos, Javier Upna Orcid; Loayssa Lara, Alayn Upna Orcid (IEEE, 2017)   Artículo / Artikulua  OpenAccess
      We report on an additional limitation that has been found in Brillouin optical time-domain analysis (BOTDA) sensors due to the so-called second-order nonlocal effects (NLE). Second-order NLE appear in BOTDA setups that ...
    • Sensitivity enhancement experimental demonstration using a low cutoff wavelength SMS modified structure coated with a pH sensitive film 

      Rodríguez Rodríguez, Wenceslao Eduardo; Del Villar, Ignacio Upna Orcid; Ruiz Zamarreño, Carlos Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Rodríguez Rodríguez, Adolfo Josué; Domínguez Cruz, René (Elsevier, 2018)   Artículo / Artikulua  OpenAccess
      The multimode interference (MMI) effect in a single mode-multimode-single mode (SMS) can be used fordevelopment of wavelength shift detection based sensors. In this work, the focus is centered on obtainingwavelength shifts ...
    • Sensitivity enhancement in low cutoff wavelength long-period fiber gratings by cladding diameter reduction 

      Del Villar, Ignacio Upna Orcid; Partridge, Matthew; Rodríguez Rodríguez, Wenceslao Eduardo; Fuentes Lorenzo, Omar Upna; Socorro Leránoz, Abián Bentor Upna Orcid; Díaz Lucas, Silvia Upna Orcid; Corres Sanz, Jesús María Upna Orcid; 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 ...
    • Sensitivity improvement of a humidity sensor based on silica nanospheres on a long-period fiber grating 

      Viegas, Diana; Goicoechea Fernández, Javier Upna Orcid; Santos, José Luís; Araújo, Francisco Moita; Ferreira, Luis Alberto; Arregui San Martín, Francisco Javier Upna Orcid; Matías Maestro, Ignacio Upna Orcid (MDPI, 2009)   Artículo / Artikulua  OpenAccess
      This work addresses a new configuration that improves the sensitivity of a humidity sensor based on a long-period fiber grating coated with a SiO(2)-nanospheres film. An intermediate higher refractive index overlay, ...
    • Sensitivity optimization with cladding-etched long period fiber gratings at the dispersion turning point 

      Del Villar, Ignacio Upna Orcid; Cruz, José Luis; Socorro Leránoz, Abián Bentor Upna Orcid; Corres Sanz, Jesús María Upna Orcid; Matías Maestro, Ignacio Upna Orcid (Optical Society of America, 2016)   Artículo / Artikulua  OpenAccess
      This work presents a refractive index sensor based on a long period fiber grating (LPFG) made in a reduced cladding fiber whose low order cladding modes have the turning point at large wavelengths. The combination of ...
    • Sensors based on thin-film coated cladding removed multimode optical fiber and single-mode multimode single-mode fiber: a comparative study 

      Del Villar, Ignacio Upna Orcid; Socorro Leránoz, Abián Bentor Upna Orcid; Hernáez Sáenz de Zaitigui, Miguel Upna Orcid; Corres Sanz, Jesús María Upna Orcid; Ruiz Zamarreño, Carlos Upna Orcid; Sánchez Zábal, Pedro Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Matías Maestro, Ignacio Upna Orcid (Hindawi Publishing Corporation, 2015)   Artículo / Artikulua  OpenAccess
      Two simple optical fibre structures that do not require the inscription of a grating, a cladding removed multimode optical fibre (CRMOF) and a single-mode multimode single-mode structure (SMS), are compared in terms of ...
    • Signal processing in ocean bottom seismographs for refraction seismology 

      Rodríguez Barbarin, Iban Upna; Mànuel Lázaro, Antonio; Carlosena García, Alfonso Upna Orcid; Bermúdez, Antoni; Río, Joaquín del; Panahi, Shahram Shariat (IEEE, 2006)   Artículo / Artikulua  OpenAccess
      This paper presents some experimental results on the application of signal processing techniques to underwater seismic signals. The novelty of this paper stems from the fact that it is the first paper, to the best of the ...
    • Simple modelling of DGS to design 1D-PBG low-pass filters 

      Garde Irigoyen, Ieltxu Aitor Upna; Yábar, Miguel Javier; Río Bocio, Carlos del Upna Orcid (Wiley, 2003)   Artículo / Artikulua  OpenAccess
      The use of defected ground structures (DGS) is being intensively explored by the microwave filter designer community. The DGSs are one possible implementation of a 1D Photonic Band Gap (1D-PBG) where some defect structures ...
    • Simplifying the feeding network for multi-beam circular antenna arrays by using corps 

      Panduro, Marco A.; Río Bocio, Carlos del Upna Orcid (EMW Publishing, 2011)   Artículo / Artikulua  OpenAccess
      An innovative way to analyze the design of beam-forming networks (BFN) for scannable multi-beam circular antenna arrays using the CORPS (Coherently Radiating Periodic Structures) concept is introduced. This design of ...
    • Simultaneous measurement of humidity and temperature based on a partially coated optical fiber long period grating 

      Urrutia Azcona, Aitor Upna Orcid; Goicoechea Fernández, Javier Upna Orcid; Ricchiuti, Amelia L.; Barrera, D.; Arregui San Martín, Francisco Javier Upna Orcid (Elsevier, 2016)   Artículo / Artikulua  OpenAccess
      A humidity and temperature optical fiber sensor based on a long-period grating (LPG), which can provide simultaneous response to both magnitudes, is proposed and demonstrated via experiments. Previously, the LPG was fully ...
    • Simultaneous measurement of humidity and vibration based on a microwire sensor system using Fast Fourier Transform technique 

      Rota Rodrigo, Sergio Upna; López Aldaba, Aitor Upna; Pérez Herrera, Rosa Ana Upna Orcid; López Bautista, María del Carmen; López-Amo Sáinz, Manuel Upna Orcid (IEEE, 2016)   Artículo / Artikulua  OpenAccess
      This paper presents a new sensor system for vibration and relative humidity measurements based on its interaction with the evanescent field of a microwire. The interrogation of the sensing head is carried out by monitoring ...
    • Simultaneous measurement of humidity and vibration based on a nanowire sensor system using Fast Fourier Transform technique 

      Rota Rodrigo, Sergio Upna; López Aldaba, Aitor Upna; Pérez Herrera, Rosa Ana Upna Orcid; López Bautista, María del Carmen; Esteban, Óscar; López-Amo Sáinz, Manuel Upna Orcid (IEEEOptical Society of America, 2016)   Artículo / Artikulua  OpenAccess
      This paper presents a new sensor system for vibration and relative humidity measurements based on its interaction with the evanescent field of a microwire. The interrogation of the sensing head is carried out by monitoring ...
    • Simultaneous measurement of strain and temperature based on clover microstructured fiber loop mirror 

      Pérez Herrera, Rosa Ana Upna Orcid; André, R. M.; Silva, S. F.; Becker, M.; Schuster, K.; Kobelke, J.; López-Amo Sáinz, Manuel Upna Orcid; Santos, José Luís; Frazão, Orlando (Elsevier, 2015)   Artículo / Artikulua  OpenAccess
      In this work, two all-fiber loop mirrors using a clover microstructured fiber for the simultaneous measurement of temperature and strain are presented. The sensing heads are formed by a short piece of clover microstructured ...
    • Simultaneous measurement of strain and temperature using a single emission line 

      Leandro González, Daniel Upna Orcid; Ams, Martin; López-Amo Sáinz, Manuel Upna Orcid; Sun, Tong; Grattan, Kenneth T. V. (IEEE / OSA, 2015)   Artículo / Artikulua  OpenAccess
      In this work, we present and demonstrate a novel sensor system for simultaneous measurement of strain and temperature through a unique combination of a long period grating (LPG) and a fiber laser based on a fiber Bragg ...
    • Simultaneous strain and temperature multipoint sensor based on microstructured optical fiber 

      López Aldaba, Aitor Upna; Auguste, Jean-Louis; Jamier, Raphael; Roy, Philippe; López-Amo Sáinz, Manuel Upna Orcid (IEEE, 2018)   Artículo / Artikulua  OpenAccess
      In this paper, a new sensor system for simultaneous and independent multipoint strain and temperature measurements is presented. The interrogation of the sensing heads has been carried out by monitoring their FFT phase ...
    • Single-longitudinal mode laser structure based on a very narrow filtering technique 

      Rodríguez Cobo, Luis; Quintela, M. A.; Rota Rodrigo, Sergio Upna; López-Amo Sáinz, Manuel Upna Orcid; López Higuera, José Miguel (Optical Society of America, 2013)   Artículo / Artikulua  OpenAccess
      A narrow filtering technique based on the spectral overlapping of two uniform FBGs and applied to obtain a Single Longitudinal Mode (SLM) laser is proposed and demonstrated in this work. The two FBGs are spectrally ...
    • Single-longitudinal-mode dual wavelength-switchable fiber laser based on superposed fiber bragg gratings 

      Pérez Herrera, Rosa Ana Upna Orcid; Rodríguez Cobo, Luis; Quintela, M. A.; López Higuera, José Miguel; López-Amo Sáinz, Manuel Upna Orcid (IEEE, 2015)   Artículo / Artikulua  OpenAccess
      n this work, a simple switchable dual-wavelength short-cavity fiber laser operating in a single-longitudinal-mode regime at room temperature and based on superposed fiber Bragg gratings is proposed and experimentally ...
    • Single-mode-multimode-single-mode and lossy mode resonance-based devices: a comparative study for sensing applications 

      Matías Maestro, Ignacio Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Corres Sanz, Jesús María Upna Orcid; Del Villar, Ignacio Upna Orcid; Hernáez Sáenz de Zaitigui, Miguel Upna Orcid; Socorro Leránoz, Abián Bentor Upna Orcid (Springer-Verlag, 2015)   Artículo / Artikulua
    • A slow light fishnet-like absorber in the millimeter-wave range 

      Navarro Cía, Miguel Upna Orcid; Torres Landívar, Víctor Upna; Beruete Díaz, Miguel Upna Orcid; Sorolla Ayza, Mario Upna (EMW Publishing, 2011)   Artículo / Artikulua  OpenAccess
      A novel route to achieve a narrowband free-space electromagnetic absorber in any range of the spectrum based on stacked subwavelength hole arrays is proposed. The absorption is obtained by means of a slow light mode inside ...
    • Slow-light and enhanced sensitivity in a displacement sensor using a lossy fiber-based ring resonator 

      Bravo Acha, Mikel Upna Orcid; Angulo Vinuesa, X.; Martín López, Sonia; López-Amo Sáinz, Manuel Upna Orcid; 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 ...

      El Repositorio ha recibido la ayuda de la Fundación Española para la Ciencia y la Tecnología para la realización de actividades en el ámbito del fomento de la investigación científica de excelencia, en la Línea 2. Repositorios institucionales (convocatoria 2020-2021).
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