Open Access
Óptica pura y aplicada a través del filtro violeta
(Sociedad Española de Optica, 2023) Delgado Pinar, Martina; Pérez Herrera, Rosa Ana; González Fernández, Verónica; Ingeniería Eléctrica, Electrónica y de Comunicación; Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren
En sus cincuenta y cinco años de historia, la revista insignia de la sociedad científica SEDOPTICA ha asistido, junto a sus socios y socias, a la transformación de un país. En este artículo analizamos cómo valores como la igualdad entre hombres y mujeres se han reflejado en la revista a lo largo de este tiempo.
Open Access
L-band multiwavelength single-longitudinal mode fiber laser for sensing applications
(IEEE / OSA, 2012) Pérez Herrera, Rosa Ana; Ullán Nieto, Ángel; Leandro González, Daniel; Fernández Vallejo, Montserrat; Quintela, M. A.; Loayssa Lara, Alayn; López Higuera, José Miguel; López-Amo Sáinz, Manuel; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
In this work, a novel single-longitudinal-mode (SLM) four-wavelength laser configuration for sensing applications in the L-band is proposed and experimentally demonstrated. The sensor system presented here is based on ring resonators, and employs fiber Bragg gratings to select the operation wavelengths. The stable SLM operation is guaranteed when all the lasing channels present similar output powers. It is also experimentally demonstrated that when a SLMbehavior is achieved, lower output power fluctuations are obtained. Characterization of the lasing structure for temperature sensing is also shown.
Open Access
Frequency modulated continuous wave system for optical fiber intensity sensors with optical amplification
(IEEE, 2009) Pérez Herrera, Rosa Ana; Frazão, Orlando; Santos, José Luís; Araújo, Francisco Moita; Ferreira, Luis Alberto; Baptista, José Manuel; López-Amo Sáinz, Manuel; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
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 experiment combines the concept of FMCW with the spectrally selective mirror properties of Bragg gratings to interrogate with referencing properties intensity based sensors. The interrogation system without amplification yields a sensor resolution of around 0.078 dB. When the EDF amplifier is introduced into the experimental set up, the sensor sensitivity does not change, but the signal-to-noise ratio is improved, resulting into an enhanced resolution of 0.025 dB. We also obtain a remote sensing operation at a location of 50 km, showing the feasibility of this configuration to be used as a remote sensing application.
Open Access
High frequency vibration sensor using a fiber laser with a multicore fiber interferometer
(IEEE, 2024) Correa Serrano, Ángel Ignacio; Galarza Galarza, Marko; Dauliat, Romain; Jamier, Raphael; Roy, Philippe; López-Amo Sáinz, Manuel; Pérez Herrera, Rosa Ana; Ingeniería Eléctrica, Electrónica y de Comunicación; Ingeniaritza Elektrikoa, Elektronikoa eta Telekomunikazio Ingeniaritza; Institute of Smart Cities - ISC
We present an interferometric vibration sensor that uses three-core fibers. The transducer is constructed by splicing a segment 20 mm long of a multicore optical fiber (MCF) to a single-mode optical fiber (SMF). The end of the MCF segment is cut off and painted using silver metallic paint. The sensor head is operated in reflection mode. The structure is placed on a polyvinyl chloride (PVC) plate, which is excited with a wide range of frequency signals. The vibrations induce cyclic bending in the MCF segment, resulting in periodic oscillations of the reflected interference spectrum. This device is demonstrated to be suitable to measure vibrations in a frequency range of the order of 300 kHz detecting deformations as small as 0.40μm .
Open Access
Tunable SESAM-based mode-locked soliton fiber laser in linear cavity by axial-strain applied to a FBG
(IEEE, 2017) Aporta, I.; Leandro González, Daniel; Quintela, M. A.; Pérez Herrera, Rosa Ana; López-Amo Sáinz, Manuel; López Higuera, José Miguel; Ingeniaritza Elektrikoa eta Elektronikoa; Institute of Smart Cities - ISC; Ingeniería Eléctrica y Electrónica
A self-started stable tunable mode-locked (ML) soliton fiber laser in a linear cavity structure composed by commercial passive elements is presented in this paper. It is based on the combination of an Erbium doped fiber (EDF) as the active medium, and a saturated fiber Bragg grating (FBG) as a partial mirror of the cavity. The other side of the cavity consists of a semiconductor saturable absorber mirror (SESAM) acting also as the mode-locking device. The central wavelength of the FBG is selected by the application of axial strain giving rise to a tunable soliton over 8.6 nm on the C band with a variable spacing of 0.01 nm. The laser delivers 18.9 ps long pulses with a 0.14 nm bandwidth, an 8.2 MHz repetition rate, a pulse energy of 89 pJ and a peak power of 4.71 W.
Open Access
Wavelength converter using a highly Er-doped optical fiber ring laser
(IOP Publishing, 2018) Pérez Herrera, Rosa Ana; López-Amo Sáinz, Manuel; Rodríguez, Luis; Ventura Rípodas, Daniel; López Higuera, José Miguel; Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren; Institute of Smart Cities - ISC; Ingeniería Eléctrica, Electrónica y de Comunicación
This work presents an all-fiber wavelength converter based on a highly Er-doped fiber laser, which has been experimentally demonstrated. Frequencies from several kilohertz up to tens of gigahertz have been investigated. Making use of the gain competition in the amplifying medium, the wavelength conversion can be carried out over not only one lasing wavelength, but over several. These analyses have also been carried out for more than one all-fiber ring structure, demonstrating the viability of this wavelength converter. To the best of our knowledge, this is the first time an Er-doped fiber wavelength converter has been validated.
Open Access
Cavidad láser de fibra óptica multibanda basada en reflectores pseudoaleatorios cuasidistribuidos
(Sociedad Española de Óptica, 2021) Sánchez González, Arturo; Pérez Herrera, Rosa Ana; Roldán Varona, Pablo; Rodríguez Cobo, Luis; López Higuera, José Miguel; 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 Publikoa, PJUPNA 1928
En este trabajo se presenta un análisis experimental de las prestaciones alcanzadas por una cavidad láser en línea asistida por un reflector de fibra con retrodispersión controlada artificialmente (RFRCA). Dicho reflector ha sido concebido para permitir oscilación en un único modo longitudinal (SLM) en bandas C y L, presentando inestabilidades en potencia de emisión inferiores a 0.1 dB y relaciones de señal óptica a ruido (OSNR) superiores a 44 dB.
Open Access
Random DFB fiber laser for remote (200 km) sensor monitoring using hybrid WDM/TDM
(IEEE, 2016) Leandro González, Daniel; Miguel Soto, Verónica de; Pérez Herrera, Rosa Ana; Bravo Acha, Mikel; López-Amo Sáinz, Manuel; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
In this paper, a random distributed feedback fiber laser is proposed as a multiplexing scheme for ultralong range measurements (up to 200 km). Optical fiber sensors are time and wavelength multiplexed overcoming one of the main limitations of long-range sensing setups, which is their limited multiplexing capability. The direct modulation of the laser's cavity allows the interrogation of sensors by measuring the reflected power for different wavelengths and distances. Fiber Bragg gratings placed at different fiber locations and wavelengths have been interrogated in two different sensor networks. In addition, in order to improve the performance of the system, some features have been analyzed.
Open Access
Low noise dual-wavelength erbium fiber laser in single-longitudinal-mode operation
(Springer, 2012) Rota Rodrigo, Sergio; Pérez Herrera, Rosa Ana; Fernández Vallejo, Montserrat; López-Amo Sáinz, Manuel; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
A new stable dual-wavelength fiber-ring laser based on erbium-doped fiber amplification is reported. The laser is based on ring resonators and employs fiber Bragg gratings to select the operation wavelengths. The topology of the laser has a significant influence in its performance: allowing an independent control of the losses for both lasing wavelengths and achieving a low noise configuration. As a result, it is experimentally demonstrated that both emission lines work in single-longitudinal-mode operation and the topology offers a better stability and higher optical signalto-noise ratios than similar configurations.
Open Access
Labescape and breakout: gamification for photonics students
(IATED, 2021) Pérez Herrera, Rosa Ana; Tainta Ausejo, Santiago; Elosúa Aguado, César; Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren; Institute of Smart Cities - ISC; Ingeniería Eléctrica, Electrónica y de Comunicación; Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa
Nowadays, the idea of using game mechanisms in non-gaming environments has become of great interest in different fields such as education or training. Not only for primary school but also in higher formal education, game-based learning appears to be an emerging trend in wide-ranging knowledge areas such as health, social policy, or engineering, among others. By employing this methodology, the process of learning becomes more motivating while reaching, in some cases, a competitive level. Game-based learning has been widely adopted in many engineering learning areas, such as for example electronics thanks to the ready availability of low-cost electronic equipment. The authors' extensive teaching experience in subjects related to electronics and photonics has led us to consider its implementation in more ambitious teaching fields. For instance, and despite the broad acceptance, its use in the field of photonics is still very scarce. The high cost of required equipment has hindered the expansion of these strategies, taking its implementation longer than desired and being too expensive at times. In the present work, the authors propose a planning and design scheme for a new gamification strategy based on an escape-room in which, all the tests to be passed will be related to the field of optics and photonics using low-cost equipment. The main field of application of this novel teaching strategy will be in the practical section of the subjects that is usually carried out in a laboratory and will be aimed at both undergraduate and master's degree students. The resolution of tests in different game sequences of the escape room is proposed, that is, linear, open, or multi-linear paths, adapting the degree of difficulty of the tests to the level of the group of students. Additionally, a co-evaluation method is suggested where the rest of the students will provide a valuable feedback to each one of their colleagues.