Pérez Herrera, Rosa Ana
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Pérez Herrera
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Rosa Ana
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Ingeniería Eléctrica, Electrónica y de Comunicación
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ISC. Institute of Smart Cities
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Publication Open Access Optical fiber lasers assisted by microdrilled optical fiber tapers(Optical Society of America, 2019) Pérez Herrera, Rosa Ana; Pallarés Aldeiturriaga, D.; Júdez Colorado, Aitor; Rodríguez Cobo, Luis; López-Amo Sáinz, Manuel; López Higuera, José Miguel; Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren; Institute of Smart Cities - ISC; Ingeniería Eléctrica, Electrónica y de ComunicaciónIn this Letter, we present an analysis of the backscattering generated in a microdrilled tapered fiber within a short-linear-cavity fiber laser. We propose and experimentally demonstrate a fiber cavity laser based on a tapered optical fiber segment that generates artificially controlled backscattering. The 50-mu m-waist taper was fabricated from a standard single-mode fiber, and the taper was subsequently microdrilled using a femtosecond laser micromachining system. The laser generation properties conferred by the microdrilled optical fiber taper were experimentally investigated. A single-wavelength laser emission at 1562 nm with an output power of 10 dBm and an optical signal-to-noise ratio greater than 45 dB is demonstrated.Publication Open Access High sensitivity fiber-optic liquid level sensor using biconical tapered fibers(Optical Society of America, 2018) Júdez Colorado, Aitor; Leandro González, Daniel; Pérez Herrera, Rosa Ana; Galarza Galarza, Marko; López-Amo Sáinz, Manuel; Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren; Institute of Smart Cities - ISC; Ingeniería Eléctrica, Electrónica y de Comunicación; Universidad Pública de Navarra / Nafarroako Unibertsitate PublikoaA liquid level sensor is presented using a biconical tapered standard single-mode fiber, being its main characteristic an outstanding sensitivity for a low cost transducer. Temperature compensation is enabled with the same interrogation equipment.Publication Open Access Spatial-frequency multiplexing of high-sensitivity liquid level sensors based on multimode interference micro-fibers(Elsevier, 2020) Galarza Galarza, Marko; Pérez Herrera, Rosa Ana; Leandro González, Daniel; Júdez Colorado, Aitor; López-Amo Sáinz, Manuel; Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren; Institute of Smart Cities - ISC; Ingeniería Eléctrica, Electrónica y de Comunicación; Universidad Pública de Navarra / Nafarroako Unibertsitate PublikoaThis 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 of the two main cylindrical modes in the micro-fiber avoiding higher order modes ormodes with other symmetries. The liquid level is calculated in real time from the measurement of thefrequency and phase components of the spectral interference pattern of the submerged micro-fiber.The system is fully characterized by theoretical simulations in terms of the sensitivity as a function ofthe most responsive parameter, which is the width of the micro-fiber. Phase sensibilities of 3.7 rad/mmare experimentally obtained and values as high as 11.4 rad/mm are theoretically predicted. The strongdependence of the spatial frequency with the width of the micro-fiber has been used to multiplex threesensors in series in this domain. The maximum detected crosstalk between sensors is 0.2 rad/mm.