• Brillouin optical time-domain analyzer for extended sensing range using probe dithering and cyclic coding 

      Iribas Pardo, Haritz; Loayssa Lara, Alayn; Sauser, Florian; Llera, Miguel; Le Floch, Sébastien (SPIE, 2017)   Congreso / Biltzarra
      We present an enhanced performance Brillouin optical time-domain analysis sensor that uses dual probes waves with optical frequency modulation and cyclic coding. The frequency modulation serves to increase the probe power ...
    • Enhancement of signal-to-noise ratio in Brillouin optical time domain analyzers by dual-probe detection 

      Iribas Pardo, Haritz; Loayssa Lara, Alayn; Sauser, Florian; Llera, Miguel; Le Floch, Sébastien (SPIE, 2017)   Congreso / Biltzarra
      We demonstrate a simple technique to enhance the signal-to-noise ratio (SNR) in Brillouin optical time-domain analysis sensors by the addition of gain and loss processes. The technique is based on the shift of the pump ...
    • Brillouin optical time-domain analysis sensor with amplification of pump pulses and tolerant to non-local effects 

      Mompó Roselló, Juan José; Urricelqui Polvorinos, Javier; Loayssa Lara, Alayn (SPIE, 2016)   Congreso / Biltzarra
      We demonstrate a simple technique to provide conventional Brillouin optical time-domain analysis sensor with compensation for pump pulse attenuation and tolerance to non-local effects. The technique is based on operating ...
    • Gain dependence of measured spectra in coherent Brillouin optical time-domain analysis sensors 

      Mariñelarena Ollacarizqueta, Jon; Urricelqui Polvorinos, Javier; Loayssa Lara, Alayn (SPIE, 2016)   Congreso / Biltzarra
      We report on the effects of large pump pulse powers on Brillouin optical time-domain analysis (BOTDA) sensors based on phase-modulated probe wave and coherent detection. It is found that the large Brillouin gain that comes ...
    • Sources of noise in Brillouin optical time-domain analyzers 

      Urricelqui Polvorinos, Javier; Soto, Marcelo A.; Thévenaz, Luc (SPIE, 2015)   Congreso / Biltzarra
      This paper presents a thorough study of the different sources of noise affecting Brillouin optical time-domain analyzers (BOTDA), providing a deep insight into the understanding of the fundamental limitations of this kind ...
    • Brilloun optical time domain analysis sensor assisted by a Brillouin distributed amplifier 

      Urricelqui Polvorinos, Javier; Sagüés García, Mikel; Loayssa Lara, Alayn (SPIE, 2015)   Congreso / Biltzarra
      We demonstrate the extension of the measurement range of Brillouin optical time-domain analysis (BOTDA) sensors using a distributed Brillouin amplifier (DBA). The technique is based on injecting a DBA pump wave in the ...
    • Mitigation of modulation instability in Brillouin distributed fiber sensors by using orthogonal polarization pulses 

      Urricelqui Polvorinos, Javier; Alem, Mehdi; Sagüés García, Mikel; Thévenaz, Luc; Loayssa Lara, Alayn; Soto, Marcelo A. (SPIE, 2015)   Congreso / Biltzarra
      A technique based on the use of orthogonally-polarized pulses is proposed to mitigate the detrimental impact of modulation instability on Brillouin distributed fiber sensors. While the theoretical underpinnings of the ...
    • Overcoming non-local effects and Brillouin threshold limitations in Brillouin distributed sensors 

      Urricelqui Polvorinos, Javier; Ruiz Lombera, Rubén; Sagüés García, Mikel; Mirapeix, Jesús; López Higuera, José Miguel; Loayssa Lara, Alayn (SPIE, 2015)   Congreso / Biltzarra
      We demonstrate, for the first time to our knowledge, a Brillouin optical time domain analysis sensor that is able to operate with a probe power larger than the Brillouin threshold of the deployed sensing fiber and that ...
    • Simplified Brillouin sensor for structural health monitoring applications based on passive optical filtering 

      Iribas Pardo, Haritz; Urricelqui Polvorinos, Javier; Mariñelarena Ollacarizqueta, Jon; Sagüés García, Mikel; Loayssa Lara, Alayn (SPIE, 2015)   Congreso / Biltzarra
      We present a simplified configuration for distributed Brillouin optical time domain analysis sensors. The technique is based on passive optical filtering of the spectral components generated in an RF-pulse-modulated optical ...
    • Enhanced tolerance to pulse extinction ratio in Brillouin optical time domain analysis sensors by dithering of the optical source 

      Iribas Pardo, Haritz; Urricelqui Polvorinos, Javier; Sagüés García, Mikel; Loayssa Lara, Alayn (SPIE, 2015)   Congreso / Biltzarra
      We demonstrate the relaxation of the stringent requirements placed on the pulse extinction ratio in long-range Brillouin optical time-domain analysis sensors (BOTDA) by modulating the wavelength of the laser source that ...
    • Technical specifications and quality control procedures for reducing the uncertainty in PV installations: results of the FP7 project PVCROPS 

      Martínez Moreno, Francisco; Lorenzo Pigueiras, Eduardo; Narvarte Fernández, Luis; Moretón Villagra, Rodrigo; Tyutyundzhiev, Nicolay; Parra Laita, Íñigo de la (EU PVSEC, 2015)   Congreso / Biltzarra
      PVCROPS (PhotoVoltaic Cost r€duction, Reliability, Operational performance, Prediction and Simulation) is a project within the European Framework Programme 7 whose objectives are: improving the performance, reliability ...
    • Brillouin distributed sensing assisted by Brillouin amplification of pump pulses 

      Urricelqui Polvorinos, Javier; Sagüés García, Mikel; Loayssa Lara, Alayn (IEEE, 2014)   Congreso / Biltzarra
      We demonstrate, for the first time to our knowledge, the extension of the measurement range of Brillouin distributed sensors (BDS) by using a distributed Brillouin amplifier (DBA) to compensate the attenuation of the ...
    • Blind spot mitigation in phased array antenna using metamaterials 

      Crépin, Thomas; Martel, Cédric; Gabard, Benjamin; Boust, Fabrice; Martinaud, Jean-Paul; Dousset, Thierry; Rodríguez Ulibarri, Pablo; Beruete Díaz, Miguel; Loecker, Claudius; Bertuch, Thomas; Marcotegui Iturmendi, José Antonio; Maci, Stefano (IEEE, 2014)   Congreso / Biltzarra
      In this work, a metaradome based on a fakir’s bed of nails is designed and tested in order to suppress the blind directions of a 100-element antenna array. The antenna is a microstrip array designed to operate in X-band. ...
    • Phasorial DPP-BOTDA sensor tolerant to non-local effects 

      Urricelqui Polvorinos, Javier; Mariñelarena Ollacarizqueta, Jon; Sagüés García, Mikel; Loayssa Lara, Alayn (SPIE, 2014)   Congreso / Biltzarra
      We introduce a modification of the differential pulse width pair technique in a BOTDA sensor based on a phase modulated probe wave and RF demodulation. This provides a differential Brillouin phasorial signal with high ...
    • Polarization diversity for Brillouin distributed fiber sensors based on a double orthogonal pump 

      Urricelqui Polvorinos, Javier; López Fernandino, Felipe; Sagüés García, Mikel; Loayssa Lara, Alayn (SPIE, 2014)   Congreso / Biltzarra
      We demonstrate a novel Brillouin optical time domain analysis sensor deploying a polarization diversity technique which eliminates the need for polarization scrambling, providing measurements that are largely immune to the ...
    • Synthesis of virtual Brillouin frequency shift profiles in BOTDA sensors using optical source dithering 

      Urricelqui Polvorinos, Javier; Sagüés García, Mikel; Loayssa Lara, Alayn (SPIE, 2014)   Congreso / Biltzarra
      We demonstrate a novel concept for Brillouin optical time domain analysis sensors that is based on synthesizing a virtual Brillouin frequency shift profile along the sensing fiber. The technique is based on modulating the ...
    • All-metallic ε-near-zero (ENZ) lens based on ultra-narrow hollow rectangular waveguides: experimental results 

      Orazbayev, Bakhtiyar; Torres Landívar, Víctor; Pacheco Peña, Víctor; Falcone Lanas, Francisco Javier; Teniente Vallinas, Jorge; Beruete Díaz, Miguel; Sorolla Ayza, Mario; Navarro Cía, Miguel; Engheta, Nader (IEEE, 2014)   Congreso / Biltzarra
      Here we perform numerical and experimental investigation of plano-concave all-metallic ε-near-zero (ENZ) lens with operational frequency f = 144 GHz. The ENZ lens is achieved by stacking an array of narrow hollow rectangular ...
    • Low profile THz periodic leaky-wave antenna 

      Beaskoetxea Gartzia, Unai; Beruete Díaz, Miguel; Rodríguez Ulibarri, Pablo; Etayo Salinas, David; Sorolla Ayza, Mario; Navarro Cía, Miguel; Zehar, Mokhtar; Blary, Karine; Chahadih, Abdallah; Han, Xiang-Lei; Akalin, Tahsin (IEEE, 2014)   Congreso / Biltzarra
      In this work, a 0.566THz flat leaky-wave antenna, consisting of a central λ0/2 slot surrounded by straight parallel wedge corrugations, is numerically and experimentally analyzed. Simulations show a moderately high gain ...
    • Analysis of radio wave propagation for ISM 2.4GHz wireless sensor networks in inhomogeneous vegetation environments 

      Azpilicueta Fernández de las Heras, Leyre; López Iturri, Peio; Aguirre Gallego, Erik; Astrain Escola, José Javier; Villadangos Alonso, Jesús; Falcone Lanas, Francisco Javier (2014)   Congreso / Biltzarra
      The use of wireless networks has been extended in an exponential growing due to the improvement in terms of battery life and low consumption of the devices. However, it is highly important to conduct previous radio propagation ...
    • Phase-shift based BOTDA measurements tolerant to non-local effects 

      Urricelqui Polvorinos, Javier; Sagüés García, Mikel; Loayssa Lara, Alayn (SPIE, 2013)   Congreso / Biltzarra
      We demonstrate a BOTDA sensor based on the use of the Brillouin phase shift that performs measurements tolerant to non local effects. This technique raises opportunities to increase the distance covered by these sensors ...