Recent Submissions

  • Hybrid Raman‑erbium random fiber laser with a half open cavity assisted by artificially controlled backscattering fiber refectors 

    Pérez Herrera, Rosa Ana Upna; Roldán Varona, Pablo; Sañudo-Lasagabaster Ibáñez, Silvia; Rodríguez Cobo, L.; López Higuera, José Miguel; López-Amo Sáinz, Manuel Upna (Springer Nature, 2021)   Artículo / Artikulua  OpenAccess
    A hybrid Raman-erbium random fber laser with a half-open cavity assisted by chirped artifcially controlled backscattering fber refectors is presented. A combination of a 2.4 km-long dispersion compensating fber with two ...
  • Metageometries for polycyclic aromatic hydrocarbons detection at THz range in food systems 

    Jáuregui-López, Irati Upna; Insausti Barrenetxea, Kizkitza Upna; Beriain Apesteguía, María José Upna; Beruete Díaz, Miguel Upna (IEEE, 2021)   Artículo / Artikulua
    Polycyclic aromatic hydrocarbons, when present in food systems, have been shown to have a detrimental effect on human health, producing carcinogenic elements. So, the implementation of processes for their detection and ...
  • Pseudo-three-stage Miller op-amp with enhanced small-signal and large-signal performance 

    Paul, Anindita; Ramírez Angulo, Jaime; López Martín, Antonio Upna; González Carvajal, Ramón; Rocha-Pérez, José Miguel (IEEE, 2019)   Artículo / Artikulua  OpenAccess
    A simple technique to implement highly power efficient class AB-AB Miller op-amps is presented in this paper. It uses a composite input stage with resistive local common mode feedback that provides class AB operation to ...
  • Subsampling OFDM-based ultrasonic data communication through metallic channels for monitoring of cargo containers 

    García Oya, José Ramón; Algueta-Miguel, Jose M. Upna; García Doblado, José; Muñoz Chavero, Fernando; Hidalgo Fort, Eduardo; Baena Lecuyer, Vicente; López Martín, Antonio Upna (IEEE, 2019)   Artículo / Artikulua  OpenAccess
    An enhanced ultrasonic communication system based on piezoelectric transducers for monitoring of goods in cargo containers is presented. The proposed system consists of several sensors placed inside the container, whose ...
  • 360 nW gate-driven ultra-low voltage CMOS linear transconductor with 1 MHz bandwidth and wide input range 

    Rico-Aniles, Héctor Daniel; Ramírez-Angulo, Jaime; López Martín, Antonio Upna; González Carvajal, Ramón (IEEE, 2020)   Artículo / Artikulua  OpenAccess
    A low voltage linear transconductor is introduced. The circuit is a pseudo differential architecture that operates with ±0.2V supplies and uses 900nA total biasing current. It employs a floating battery technique to achieve ...
  • Energy-efficient amplifiers based on quasi-floating gate techniques 

    López Martín, Antonio Upna; Garde Luque, María Pilar Upna; Algueta-Miguel, Jose M.; Beloso-Legarra, Javier; González Carvajal, Ramón; Ramírez-Angulo, Jaime (MDPI, 2021)   Artículo / Artikulua  OpenAccess
    Energy efficiency is a key requirement in the design of amplifiers for modern wireless applica-tions. The use of quasi-floating gate (QFG) transistors is a very convenient approach to achieve such energy efficiency. We ...
  • Super-gain-boosted AB-AB fully differential Miller op-amp with 156dB open-loop gain and 174MV/V MHZ pF/uW figure of merit in 130nm CMOS technology 

    Paul, Anindita; Ramírez-Angulo, Jaime; Díaz Sánchez, Alejandro; López Martín, Antonio Upna; González Carvajal, Ramón; Li, Frank X. (IEEE, 2021)   Artículo / Artikulua  OpenAccess
    A fully differential Miller op-amp with a composite input stage using resistive local common-mode feedback and regulated cascode transistors is presented here. High gain pseudo-differential auxiliary amplifiers are used ...
  • Sensitivity optimization of a microstructured optical fiber ammonia gas sensor by means of tuning the thickness of a metal oxide nano-coating 

    López Torres, Diego Upna; López Aldaba, Aitor Upna; Elosúa Aguado, César Upna; Auguste, Jean-Louis; Jamier, Raphael; Roy, Philippe; López-Amo Sáinz, Manuel Upna (IEEE, 2019)   Artículo / Artikulua  OpenAccess
    In this paper, the influence of the thickness of metallic-oxide coatings, ITO, and SnO2 on the sensitivity of a microstructured optical fiber Fabry–Pérot (FP) has been studied with the aim of developing ammonia gas fiber ...
  • Liquid level sensor based on dynamic Fabry–Perot interferometers in processed capillary fiber 

    Roldán Varona, Pablo; Pérez Herrera, Rosa Ana Upna; Rodríguez Cobo, L.; Reyes González, Luis; López-Amo Sáinz, Manuel Upna (Springer Nature, 2021)   Artículo / Artikulua  OpenAccess
    In this work, a novel optical fiber sensor capable of measuring both the liquid level and its refractive index is designed, manufactured and demonstrated through simulations and experimentally. For this, a silica capillary ...
  • Single longitudinal mode lasers by using artificially controlled backscattering erbium doped fibers 

    Pérez Herrera, Rosa Ana Upna; Roldán Varona, Pablo; Rodríguez Cobo, L.; López Higuera, José Miguel; López-Amo Sáinz, Manuel Upna (IEEE, 2021)   Artículo / Artikulua  OpenAccess
    In this work, we propose and experimentally demonstrate a new distributed short linear cavity ber laser. At one of the cavity ends, fabricated by a commercial femtosecond ber laser chirped pulse ampli er, an arti cially ...
  • Spatial-frequency multiplexing of high-sensitivity liquid level sensors based on multimode interference micro-fibers 

    Galarza Galarza, Marko Upna; Pérez Herrera, Rosa Ana Upna; Leandro González, Daniel Upna; Júdez Colorado, Aitor Upna; López-Amo Sáinz, Manuel Upna (Elsevier, 2020)   Artículo / Artikulua
    This paper shows a new fiber optic sensor multiplexed system for liquid level sensing. Biconical fibertapers converging at a 40 mm-long micro-fiber are used as transducers. The tapers are designed to providethe propagation ...
  • Silicon integrated subharmonic mixer on a photonic-crystal platform 

    Torres-García, Alicia Upna; Pérez Escudero, José Manuel Upna; Teniente Vallinas, Jorge Upna; Gonzalo García, Ramón Upna; Ederra Urzainqui, Íñigo Upna (IEEE, 2021)   Artículo / Artikulua
    This paper presents a planar silicon integrated subharmonic mixer on top of a photonic-crystal platform. The local oscillator (LO) power is injected through a 2D photoniccrystal (PC) slab to a resonant cavity that effectively ...
  • Multiparameter sensor based on a multiinterferometric serial configuration for temperature and strain measurements 

    Pérez Herrera, Rosa Ana Upna; Bravo Acha, Mikel Upna; Leandro González, Daniel Upna; Novais, Susana; Pradas Martínez, Javier; López-Amo Sáinz, Manuel Upna (IEEE, 2021)   Artículo / Artikulua
    In this work, a multi-parameter point sensor based on the combination of Fabry-Perot (FP) and the anti-resonant (AR) reflecting guidance in cascade configuration is proposed and experimentally demonstrated. This structure, ...
  • Bull’s-eye antenna with circular polarization at millimeter waves based on ridge gap waveguide technology 

    Pérez, Dayan; Ederra Urzainqui, Íñigo Upna; Beruete Díaz, Miguel Upna (IEEE, 2021)   Artículo / Artikulua
    In this communication, a Bull’s-Eye (BE) antenna with circular polarization (CP) based on ridge gap waveguide (RGW) technology is numerically and experimentally demonstrated. The structure is excited from the bottom with ...
  • Modified Soret lenses for dual band integrated detectors at submillimetre and millimetre wavelengths 

    Torres García, Alicia Elena; Pérez Escudero, José Manuel Upna; Gonzalo García, Ramón Upna; Ederra Urzainqui, Íñigo Upna (IEEE, 2020)   Artículo / Artikulua  OpenAccess
    This paper presents a planar silicon integrated subharmonic mixer on top of a photonic-crystal platform. The local oscillator (LO) power is injected through a 2D photonic crystal (PC) slab to a resonant cavity that effectively ...
  • Low cutoff wavelength etched SMS structures towards verification of the quality of automotive antifreeze 

    Rodríguez Rodríguez, Wenceslao Eduardo; Rodríguez Rodríguez, Adolfo Josué; Ruiz Zamarreño, Carlos Upna; Del Villar, Ignacio Upna; Zúñiga Alanís, Manuel (IEEE, 2020)   Artículo / Artikulua
    Optical fiber single mode-multimode-single mode (SMS) structures can be used as wavelength detection-based sensors. In this work, we focus on the performance at short wavelengths, where optical sources and detectors are ...
  • Digital holography applied to simultaneously measure the shape and the radial deformation of a blood vessel (ex-vivo) 

    Andres, Nieves; Pinto Fuste, Cristina Leyre; Lobera, Julia; López, Ana M.; Palero, V. R. (Elsevier, 2020)   Artículo / Artikulua
    Radial deformation of blood vessels has been measured by combining shape and deformation measurements. The difficulty of measuring both magnitudes simultaneously is related to the different order of magnitude. The veins ...
  • Bloch waves at the surface of a single-layer coating D-shaped photonic crystal fiber 

    González Valencia, Esteban; Del Villar, Ignacio Upna; Torres, Pedro (Optical Society of America, 2020)   Artículo / Artikulua  OpenAccess
    Bloch surface wave (BSW) platforms are particularly interesting for light confinement and surface sensitivity, as an alternative to the metal-based surface plasmon polaritons (SPP). However, most of the reported BSW platforms ...
  • Maximum expected ramp rates using cloud speed sensor measurements 

    Wang, Guang Chao; Kurtz, Ben; Bosch, Juan Luis; Parra Laita, Íñigo de la Upna; Kleissl, Jan (American Institute of Physics, 2020)   Artículo / Artikulua
    Large ramps and ramp rates in photovoltaic (PV) power output are of concern and sometimes even explicitly restricted by grid operators. Battery energy storage systems can smooth the power output and maintain ramp rates ...
  • Optical fiber vacuum sensor based on etched SMS structure and PDMS coating 

    Ascorbe Muruzabal, Joaquín Upna; Fuentes Lorenzo, Omar Upna; Arregui San Martín, Francisco Javier; Matías Maestro, Ignacio Upna; Corres Sanz, Jesús María Upna (IEEE, 2020)   Artículo / Artikulua
    In this work, an optical fiber vacuum sensor based on a single-mode multimode single-mode (SMS) structure coated with polydimethylsiloxane (PDMS) is studied. The SMS structure generates an interferometric pattern based on ...

View more