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158 results on '"Durana, Gaizka"'

1. Compact omnidirectional multicore fiber-based vector bending sensor

Author

Amorebieta, Josu, Ortega-Gomez, Angel, Durana, Gaizka, Fernández, Rubén, Antonio-Lopez, Enrique, Schülzgen, Axel, Zubia, Joseba, Amezcua-Correa, Rodrigo, and Villatoro, Joel

Subjects
Physics - Optics
Abstract

We propose and demonstrate a compact and simple vector bending sensor capable of distinguishing any direction and amplitude with high accuracy. The sensor consists of a short segment of asymmetric multicore fiber (MCF) fusion spliced to a standard single mode fiber. The reflection spectrum of such a structure shifts and shrinks in specific manners depending on the direction in which the MCF is bent. By monitoring simultaneously wavelength shift and light power variations, the amplitude and bend direction of the MCF can be unmistakably measured in any orientation, from 0{\deg} to 360{\deg}. The bending sensor proposed here is highly sensitive even for small bending angles (below 1{\deg}).

Published
2024
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2. Sensitivity-optimized strongly coupled multicore fiber-based thermometer

Author

Amorebieta, Josu, Ortega-Gómez, Ángel, Fernández, Rubén, Antonio-López, José Enrique, Schülzgen, Axel, Zubia, Joseba, Amezcua-Correa, Rodrigo, Durana, Gaizka, and Villatoro, Joel

Subjects
Physics - Optics
Abstract

In this paper, we report on a multicore fiber-based (MCF) temperature sensor that operates in a wide thermal range and that is robustly packaged to withstand harsh environments. To develop the sensor, the fundamentals concerning the effect of temperature on such fibers have been analyzed in detail to predict the most temperature sensitive MCF geometry. Thanks to it, the device, which operates in reflection mode and consists of a short segment of strongly coupled MCF fusion spliced to a standard single mode fiber, shows higher sensitivity than other devices with identical configuration. Regarding its packaging, it consists of an inner ceramic and two outer metallic tubes to provide rigidity and protection against impacts or dirt. The device was calibrated for a thermal range from 25 C to 900 C and a K-type thermocouple was used as reference. Our results suggest that the manufactured optical thermometer is as accurate as the electronic one, reaching a sensitivity up to 29.426 pm/C with the advantage of being passive, compact and easy to fabricate and interrogate. Therefore, we believe this device is appealing for industrial applications that require highly sensitive temperature sensing in very demanding environments, and that the analysis included in this work could be analogously applied to develop sensitivity-optimized devices for other parameters of interest.

Published
2024
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3. Highly sensitive multicore fiber accelerometer for low frequency vibration sensing

Author

Amorebieta, Josu, Ortega-Gómez, Ángel, Durana, Gaizka, Fernández, Rubén, Antonio-López, José Enrique, Schülzgen, Axel, Zubia, Joseba, Amezcua-Correa, Rodrigo, and Villatoro, Joel

Subjects
Physics - Optics, Physics - Instrumentation and Detectors
Abstract

We report on a compact, highly sensitive all-fiber accelerometer suitable for low frequency and low amplitude vibration sensing. The sensing elements in the device are two short segments of strongly coupled asymmetric multicore fiber (MCF) fusion spliced at 180{\deg} with respect to each other. Such segments of MCF are sandwiched between standard single mode fibers. The reflection spectrum of the device exhibits a narrow spectrum whose height and position in wavelength changes when it is subjected to vibrations. The interrogation of the accelerometer was carried out by a spectrometer and a photodetector to measure simultaneously wavelength shift and light power variations. The device was subjected to a wide range of vibration frequencies, from 1 mHz to 30 Hz, and accelerations from 0.76 mg to 29.64 mg, and performed linearly, with a sensitivity of 2.213 nW/mg. Therefore, we believe the accelerometer reported here may represent an alternative to existing electronic and optical accelerometers, especially for low frequency and amplitude vibrations, thanks to its compactness, simplicity, cost-effectiveness, implementation easiness and high sensitivity.

Published
2024
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4. Twin-core fiber sensor integrated in laser cavity

Author

Amorebieta, Josu, Pereira, Joao, Durana, Gaizka, Franciscangelis, Carolina, Ortega-Gómez, Ángel, Zubia, Joseba, Villatoro, Joel, and Margulis, Walter

Subjects
Physics - Optics, Physics - Applied Physics
Abstract

In this work, we report on a twin-core fiber sensor system that provides improved spectral efficiency, allows for multiplexing and gives low level of crosstalk. Pieces of the referred strongly coupled multicore fiber are used as sensors in a laser cavity incorporating a pulsed semiconductor optical amplifier (SOA). Each sensor has its unique cavity length and can be addressed individually by electrically matching the periodic gating of the SOA to the sensors cavity roundtrip time. The interrogator acts as a laser and provides a narrow spectrum with high signal-to-noise ratio. Furthermore, it allows distinguishing the response of individual sensors even in the case of overlapping spectra. Potentially, the number of interrogated sensors can be increased significantly, which is an appealing feature for multipoint sensing.

Published
2024
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6. Structural Health Monitoring System for Micro-hydraulic Power Stations Through Water Level Monitoring with a Wireless Network of Optical Sensors

Author

Bargiela, Danel, Zornoza, Ander, Ayesta, Igor, Berganza, Amaia, Durana, Gaizka, Zubia, Joseba, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Rizzo, Piervincenzo, editor, and Milazzo, Alberto, editor

Published
2023
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24. Analysis of a plastic optical fiber-based displacement sensor

Author

Jimenez, Felipe, Arrue, Jon, Aldabaldetreku, Gotzon, Durana, Gaizka, Zubia, Joseba, Ziemann, Olaf, and Bunge, Christian-Alexander

Subjects
Attenuation -- Measurement, Approximation theory -- Usage, Fiber optics -- Equipment and supplies, Fiber optics -- Design and construction, Astronomy, Physics
Abstract

An easy-to-manufacture setup for a displacement sensor based on plastic optical fiber (POF) is analyzed, showing computational and experimental results. If the displacement is the consequence of force or pressure applied to the device, this can be used as a force or pressure transducer. Its principle of operation consists of bending a POF section around a flexible cylinder and measuring light attenuation when the whole set is subjected to side pressure. Attenuations are obtained computationally as a function of side deformation for different design parameters. Experimental results with an actually built prototype are also provided. OCIS codes: 060.2370, 250.5460, 080.2720, 000.4430.

Published
2007

27. Dependence of bending losses on cladding thickness in plastic optical fibers

Author

Durana, Gaizka, Zubia, Joseba, Arrue, Jon, Aldabaldetreku, Gotzon, and Mateo, Javier

Subjects
Optics -- Research, Fiber optics -- Analysis, Bending -- Analysis, Fiber optics, Astronomy, Physics
Abstract

Our main goal is to provide a comprehensive explanation of the existing differences in bending losses arising from having step-index multimode plastic optical fibers with different cladding thicknesses and under different types of conditions, namely, the variable bend radius R, the number of fiber turns, or the fiber diameter. For this purpose, both experimental and numerical results of bending losses are presented for different cladding thicknesses and conditions. For the measurements, two cladding thicknesses have been considered: one finite and another infinite. A fiber in air has a finite cladding thickness, and rays are reflected at the cladding-air interface, whereas a fiber covered by oil is equivalent to having an infinite cladding, since the very similar refractive index of oil prevents reflections from occurring at the cladding-oil interface. For the sake of comparison, numerical simulations based on ray tracing have been performed for finite-cladding step-index multimode waveguides. The numerical results reinforce the experimental data, and both the experimental measurements and the computational simulations turn out to be very useful to explain the behavior of refracting and tunneling rays along bent multimode waveguides and along finite-cladding fibers. OCIS codes: 060.0060, 060.2270, 060.2300, 060.2310.

Published
2003

30. A REFLECTROMETRIC SYSTEM BASED ON PLASTIC OPTICAL FIBER BUNDLE FOR THIN FILM MEASUREMENT.

Author

Zubia, Gorka, Amorebieta, Josu, Durana, Gaizka, Aldabaldetreku, Gotzon, Vázquez, Carmen, and Zubia, Joseba

Subjects
REFLECTANCE, OPTICAL fiber communication, THIN films, SILICA, WAVELENGTHS
Abstract

Thin film thickness measurement is key in the manufacturing process of semiconductors, bioimplants or thin film solar cells, for instance. This work presents a thin film measurement technique based on a reflectometric system with a plastic optical fiber bundle (POFB). The system is composed by a light source, the POFB and a spectrometer to measure the surface reflectivity as a function of wavelength. Measurements were performed over two samples of silicon oxide films upon silica substrate of 1000 Å and 10000 Å, respectively. The POFB was placed one centimeter above each sample. The designed system offers a nanometric accuracy. [ABSTRACT FROM AUTHOR]

Published
2022

32. Packaged Multi-Core Fiber Interferometer for High-Temperature Sensing

Author

Amorebieta, Josu, primary, Durana, Gaizka, additional, Ortega-Gomez, Angel, additional, Fernandez, Ruben, additional, Velasco, Javier, additional, Saez de Ocariz, Idurre, additional, Zubia, Joseba, additional, Antonio-Lopez, Jose Enrique, additional, Schulzgen, Axel, additional, Amezcua-Correa, Rodrigo, additional, and Villatoro, Joel, additional

Published
2019
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39. Cover Image, Volume 67, Issue 9

Author

Arrospide, Eneko, primary, Durana, Gaizka, additional, Azkune, Mikel, additional, Aldabaldetreku, Gotzon, additional, Bikandi, Iñaki, additional, Ruiz-Rubio, Leire, additional, and Zubia, Joseba, additional

Published
2018
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50. Spectroscopic characterization of plastic optical fibers doped with fluorene oligomers

Author

Illarramendi, Maria Asuncion, Zubia, Joseba, Bazzana, Luca, Durana, Gaizka, Aldabaldetreku, Gotzon, and Sarasua, Jose Ramon

Subjects
Fiber optics -- Equipment and supplies, Oligomers, Mass communications
Abstract

Journal of Lightwave Technology, vol. 27, no. 15, August 1, 2009 With the development of polymer optical fibers (POFs) in the last years [1], increased research activities have also been [...]

Published
2009

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