Recent Submissions

  • All-fiber lasers through photonic crystal fibers 

    Rodrigues Pinto, Ana Margarida Upna; López-Amo Sáinz, Manuel Upna (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 ...
  • 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 ...
  • Comparative study of ring and random cavities for fiber lasers 

    Fernández Vallejo, Montserrat Upna; Rota Rodrigo, Sergio Upna; López-Amo Sáinz, Manuel Upna (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 ...
  • Polarized optical feedback from an extremely short external cavity for controlling and stabilizing the polarization of vertical cavity surface emitting lasers 

    Arizaleta Arteaga, Mikel Upna; Parriaux, Olivier; López-Amo Sáinz, Manuel Upna; Thienpont, Hugo; Panajotov, Krassimir (AIP Publishing, 2007)   Artículo / Artikulua  OpenAccess
    The authors present experimental results showing that polarization selective optical feedback from an extremely short external cavity induces switching between the two fundamental transverse modes with orthogonal linear ...
  • Experimental evidence of coherence resonance in a time-delayed bistable system 

    Arizaleta Arteaga, Mikel Upna; Valencia, Miguel; Sciamanna, Marc; Thienpont, Hugo; López-Amo Sáinz, Manuel Upna; Panajotov, Krassimir (APS Physics, 2007)   Artículo / Artikulua  OpenAccess
    We report on the experimental observation of coherence resonance in a bistable system with delay. Our system consists of a vertical-cavity surface-emitting laser subject to time-delayed optical feedback simultaneously from ...
  • Simultaneous measurement of strain and temperature based on clover microstructured fiber loop mirror 

    Pérez Herrera, Rosa Ana Upna; André, R. M.; Silva, S. F.; Becker, M.; Schuster, K.; Kobelke, J.; López-Amo Sáinz, Manuel Upna; 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 ...
  • Role of external cavity reflectivity for achieving polarization control and stabilization of vertical cavity surface emitting laser 

    Arizaleta Arteaga, Mikel Upna; López-Amo Sáinz, Manuel Upna; Thienpont, Hugo; Panajotov, Krassimir (AIP Publishing, 2007)   Artículo / Artikulua  OpenAccess
    The authors present the experimental results showing how the external mirror reflectivity affects the polarization properties of a vertical cavity surface emitting laser subject to optical feedback from an extremely short ...
  • Tailoring light polarization in vertical cavity surface emitting lasers by isotropic optical feedback from an extremely short external cavity 

    Arizaleta Arteaga, Mikel Upna; López-Amo Sáinz, Manuel Upna; Thienpont, Hugo; Panajotov, Krassimir (AIP Publishing, 2006)   Artículo / Artikulua  OpenAccess
    The authors experimentally show that isotropic optical feedback from an extremely short external cavity can induce switching between the two fundamental transverse modes with orthogonal linear polarization of otherwise ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Frequency modulated continuous wave system for optical fiber intensity sensors with optical amplification 

    Pérez Herrera, Rosa Ana Upna; Frazão, Orlando; Santos, José Luís; Araújo, Francisco Moita; Ferreira, Luis Alberto; Baptista, José Manuel; López-Amo Sáinz, Manuel Upna (IEEE, 2009)   Artículo / Artikulua  OpenAccess
    We report on the use of erbium doped fiber (EDF) amplification to enhance a frequency modulated continuous wave (FMCW) technique for referencing optical intensity sensors located between two Bragg grating structures. The ...
  • Switchable erbium doped fiber ring laser system for temperature sensors multiplexing 

    Rota Rodrigo, Sergio Upna; Rodríguez Cobo, L.; Quintela, M. A.; López Higuera, José Miguel; López-Amo Sáinz, Manuel Upna (IEEE, 2013)   Artículo / Artikulua  OpenAccess
    In this paper a proof of concept of a switchable erbium doped fiber ring laser (EDFRL) system, demonstrated for temperature sensors multiplexing, was carried out showing a high linearity and a sensitivity of 1.55 GHz/°C. ...
  • 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 ...
  • Narrow-linewidth multi-wavelength random distributed feedback laser 

    Leandro González, Daniel Upna; Rota Rodrigo, Sergio Upna; Ardanaz, Diego; López-Amo Sáinz, Manuel Upna (IEEE / OSA, 2015)   Artículo / Artikulua  OpenAccess
    In this work, narrow-band emission lines are generated by means of two random distributed feedback fiber laser schemes. Spectral line-widths as narrow as 3.2 pm have been measured, which significantly improves previous ...
  • Compound lasing fiber optic ring resonators for sensor sensitivity enhancement 

    Rota Rodrigo, Sergio Upna; González Herráez, Miguel; López-Amo Sáinz, Manuel Upna (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, ...
  • 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 ...
  • 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 ...
  • Simultaneous measurement of strain and temperature using a single emission line 

    Leandro González, Daniel Upna; Ams, Martin; López-Amo Sáinz, Manuel Upna; 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 ...
  • Optimization of the available spectrum of a WDM sensors network using a mode locked laser 

    Fernández Vallejo, Montserrat Upna; Ardanaz, Diego; López-Amo Sáinz, Manuel Upna (IEEE / OSA, 2015)   Artículo / Artikulua  OpenAccess
    This work experimentally proposes a new interrogation method which consists on the combination of the information given by both domains: time and frequency. On the one hand, the sensor information is obtained in the frequency ...

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