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    Experimental and numerical study of the symbolic dynamics of a modulated external-cavity semiconductor laser  Open access

     Aragoneses Aguado, Andres; Sorrentino Amaral, Taciano; Perrone, Sandro; Gauthier, Daniel; Torrent Serra, Maria Del Carmen; Masoller Alonso, Cristina
    Optics express
    Vol. 22, num. 4, p. 4705-4713
    DOI: 10.1364/OE.22.004705
    Date of publication: 2014-02-21
    Journal article

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    We study the symbolic dynamics of a stochastic excitable optical system with periodic forcing. Specifically, we consider a directly modulated semiconductor laser with optical feedback in the low frequency fluctuations (LFF) regime. We use a method of symbolic time-series analysis that allows us to uncover serial correlations in the sequence of intensity dropouts. By transforming the sequence of inter-dropout intervals into a sequence of symbolic patterns and analyzing the statistics of the patterns, we unveil correlations among several consecutive dropouts and we identify clear changes in the dynamics as the modulation amplitude increases. To confirm the robustness of the observations, the experiments were performed using two lasers under different feedback conditions. Simulations of the Lang-Kobayashi (LK) model, including spontaneous emission noise, are found to be in good agreement with the observations, providing an interpretation of the correlations present in the dropout sequence as due to the interplay of the underlying attractor topology, the external forcing, and the noise that sustains the dropout events.

    We study the symbolic dynamics of a stochastic excitable optical system with periodic forcing. Specifically, we consider a directly modulated semiconductor laser with optical feedback in the low frequency fluctuations (LFF) regime. We use a method of symbolic time-series analysis that allows us to uncover serial correlations in the sequence of intensity dropouts. By transforming the sequence of inter-dropout intervals into a sequence of symbolic patterns and analyzing the statistics of the patterns, we unveil correlations among several consecutive dropouts and we identify clear changes in the dynamics as the modulation amplitude increases. To confirm the robustness of the observations, the experiments were performed using two lasers under different feedback conditions. Simulations of the Lang-Kobayashi (LK) model, including spontaneous emission noise, are found to be in good agreement with the observations, providing an interpretation of the correlations present in the dropout sequence as due to the interplay of the underlying attractor topology, the external forcing, and the noise that sustains the dropout events.

    Missatge de l'editor: "This paper was published in Optics express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/fulltext.cfm?uri=oe-22-4-4705&id=279795. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law."

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    Unveiling the complex organization of recurrent patterns in spiking dynamical systems  Open access

     Aragoneses Aguado, Andres; Perrone, Sandro; Sorrentino Amaral, Taciano; Torrent Serra, Maria Del Carmen; Masoller Alonso, Cristina
    Scientific reports
    Vol. 4, p. 4696-1-4696-6
    DOI: 10.1038/srep04696
    Date of publication: 2014-04-15
    Journal article

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    Complex systems displaying recurrent spike patterns are ubiquitous in nature. Understanding the organization of these patterns is a challenging task. Here we study experimentally the spiking output of a semiconductor laser with feedback. By using symbolic analysis we unveil a nontrivial organization of patterns, revealing serial spike correlations. The probabilities of the patterns display a well-defined, hierarchical and clustered structure that can be understood in terms of a delayed model. Most importantly, we identify a minimal model, a modified circle map, which displays the same symbolic organization. The validity of this minimal model is confirmed by analyzing the output of the forced laser. Since the circle map describes many dynamical systems, including neurons and cardiac cells, our results suggest that similar correlations and hierarchies of patterns can be found in other systems. Our findings also pave the way for optical neurons that could provide a controllable set up to mimic neuronal activity.

    Complex systems displaying recurrent spike patterns are ubiquitous in nature. Understanding the organization of these patterns is a challenging task. Here we study experimentally the spiking output of a semiconductor laser with feedback. By using symbolic analysis we unveil a nontrivial organization of patterns, revealing serial spike correlations. The probabilities of the patterns display a well-defined, hierarchical and clustered structure that can be understood in terms of a delayed model. Most importantly, we identify a minimal model, a modified circle map, which displays the same symbolic organization. The validity of this minimal model is confirmed by analyzing the output of the forced laser. Since the circle map describes many dynamical systems, including neurons and cardiac cells, our results suggest that similar correlations and hierarchies of patterns can be found in other systems. Our findings also pave the way for optical neurons that could provide a controllable set up to mimic neuronal activity.

  • Experimental study of feedback-induced dynamics in semiconductor lasers:from symbolic analysis to subwavelength position sensing

     Aragoneses Aguado, Andres
    Department of Physics and Nuclear Engineering, Universitat Politècnica de Catalunya
    Theses

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    El objetivo de esta tesis es el estudio de la dinámica inducida por realimentación óptica en láseres de semiconductor. Dicho estudio persigue, por un lado, profundizar en el conocimiento de aspectos generales de los sistemas complejos, y por otro lado, utilizar dicha dinámica para crear un protocolo para medir desplazamientos en dos dimensiones con una resolución mucho menor que la longitud de onda del láser utilizado. La intensidad de la luz emitida por un láser de semiconductor es estable salvo fluctuaciones debidas al ruido de emisión espontánea. Sin embargo, cuando la luz del láser se refleja en una superficie y parte de esta luz vuelve a entrar en el láser, la intensidad de la luz emitida se puede desestabilizar y mostrar una amplia gama de comportamientos dinámicos. Uno de los regímenes dinámicos presentes en láseres con realimentación óptica es el de fluctuaciones de baja frecuencia (LFF de sus siglas en inglés). Está dinámica se caracteriza por caídas abruptas de la intensidad del láser (hasta casi apagarse), seguidas de recuperaciones graduales, siendo la separación temporal entre dos caídas consecutivas irregular. La primera parte de esta tesis está entrada en este régimen dinámico, habiéndose realizado un detallado estudio experimental para caracterizarlo. Se ha utilizado un análisis simbólico de series de datos basado en patrones ordinales, definidos mediante la comparación de tiempos consecutivos entre caídas. En la dinámica del láser de semiconductor con realimentación intervienen varios factores: la interacción no lineal entre luz y materia en el medio activo del láser, el ruido cuántico debido a la emisión espontánea y la señal retardada de la realimentación. Por ello las caídas en el régimen de LFFs pueden ser inducidas tanto por ruido como por procesos deterministas. En esta tesis, mediante el análisis simbólico se ha conseguido distinguir estadísticamente, qué caídas pueden ser inducidas por ruido y cuales presentan una estadística que muestra señales de determinismo. En esta tesis también se ha estudiado la dinámica simbólica del régimen de LFF y se han encontrado correlaciones entre varias caídas consecutivas. También se ha encontrado una estructura jerárquica en la dinámica simbólica que incluye emparejamientosde las probabilidades de los patrones simbólicos. Además se ha encontrado un modelo simple a tiempo discreto (mapa) que describe adecuadamente la dinámica simbólica del régimes de LFF. Debido a la importancia de forzamientos externos en sistemas dinámicos, se han realizado experimentos incorporando modulación en la corriente de inyección del láser. Estos experimentos han permitido caracterizar el efecto de la amplitud de la modulación en la dinámica simbólica, encontrando cambios claros en la estructura simbólica, inducidos por la modulación, pero que se conservan los emparejamientos observados sin modulación. El modelo simple ha sido verificado ya que reproduce satisfactoriamente la dinámica simbólica encontrada en los datos experimentales. Asimismo, en esta tesis se ha demostrado experimentalmente un protocolo que permite detectar desplazamientos de doegimens objetos independientes en una escala muy inferior a la longitud de onda de la luz empleada (lambda/160). Para ello se ha diseñado un experimento donde el láser esta sometido a realimentación de dos espejos que se mueven de manera independiente. Además de la alta resolución, otra ventaja de este protocolo reside en que únicamente es preciso medir una variable para calcular los dos desplazamientos.

  • Experimental study of the complex dynamics of semiconductor lasers with feedback via symbolic time-series analysis

     Sorrentino Amaral, Taciano; Aragoneses Aguado, Andres; Perrone, Sandro; Gauthier, Daniel; Torrent Serra, Maria Del Carmen; Masoller Alonso, Cristina
    Semiconductor Lasers and Laser Dynamics
    DOI: 10.1117/12.2052322
    Presentation's date: 2014-04
    Presentation of work at congresses

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    We investigate the symbolic dynamics of an excitable optical system under periodic forcing. Particularly, we consider the low-frequency fluctuation (LFF) dynamics of a semiconductor laser with periodically-modulated injection current and optical feedback. We use a method of symbolic time-series analysis that allows us to unveil serial correlations in the sequence of intensity dropouts. By transforming the sequence of inter-dropout intervals into a sequence of ordinal patterns and analyzing the statistics of the patterns, we uncover correlations among several consecutive dropouts and we identify definite changes in the dynamics as the modulation amplitude increases. We confirm the robustness of the observations by conducting the experiments with two different lasers under different feedback conditions. The results are also shown to be robust to variations of the threshold used for detecting the dropouts. Simulations of the Lang-Kobayashi (LK) model, including spontaneous emission noise, are found to be in good qualitative agreement with the observations, providing an interpretation of the correlations present in the dropout sequence as due to the interplay of the underlying attractor topology, the periodic forcing, and the noise that sustains the dropout events

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    Multidimensional subwavelength position sensing using a semiconductor laser with optical feedback  Open access

     Cohen, Seth; Aragoneses Aguado, Andres; Rontani, Damien; Torrent Serra, Maria Del Carmen; Masoller Alonso, Cristina; Gauthier, Daniel
    Optics letters
    Vol. 38, num. 21, p. 4331-4334
    DOI: 10.1364/OL.38.004331
    Date of publication: 2013-11-01
    Journal article

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    We demonstrate experimentally how to harness quasi-periodic dynamics in a semiconductor laser with dual optical feedback for measuring subwavelength changes in each arm of the cavity simultaneously. We exploit the multifrequency spectrum of quasi-periodic dynamics and show that independent frequency shifts are mapped uniquely to two-dimensional displacements of the arms in the external cavity. Considering a laser diode operating at telecommunication wavelength ¿¿1550¿¿nm, we achieve an average nanoscale resolution of approximately 9.8 nm (~¿/160).

    We demonstrate experimentally how to harness quasi-periodic dynamics in a semiconductor laser with dual optical feedback for measuring subwavelength changes in each arm of the cavity simultaneously. We exploit the multifrequency spectrum of quasi-periodic dynamics and show that independent frequency shifts are mapped uniquely to two-dimensional displacements of the arms in the external cavity. Considering a laser diode operating at telecommunication wavelength λ≈1550nm, we achieve an average nanoscale resolution of approximately 9.8 nm (∼λ∕160).

  • ESTOCASTICIDAD EN SISTEMAS COMPLEJOS NOLINEALES

     Pons Rivero, Antonio Javier; Torrent Serra, Maria Del Carmen; Masoller Alonso, Cristina; Pigolotti, Simone; Ramirez de La Piscina Millan, Laureano; Peñaranda Ayllon, Angelina; Malagarriga Guasch, Daniel; Dies Miracle, Marta; Aragoneses Aguado, Andres; Deza, Juan Ignacio; Garcia Ojalvo, Jorge
    Competitive project

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  • Effect of humidity in charge formation and transport in LDPE

     Aragoneses Aguado, Andres; Tamayo, Ildaberto; Lebrato González, Alexander; Cañadas Lorenzo, Juan Carlos; Diego Vives, Jose Antonio; Arencón Osuna, David; Belana Punseti, Juan
    Journal of electrostatics
    Vol. 71, num. 4, p. 611-617
    DOI: 10.1016/j.elstat.2013.03.003
    Date of publication: 2013-04-02
    Journal article

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    Charge distribution and transport have been investigated in LDPE films with different humidity content under electric fields up to 130 MV/m. Pulsed electroacoustic measurements showed that, as water content increases, positive charge packets formation in the anode is enhanced and they propagate toward the cathode with higher transit speeds. Fits of surface potential decay measurements showed that charges in dry samples are injected directly into the volume, but the presence of moisture generates new trap centers in the surface of the material. This new trap level causes a charge accumulation on the surface, that gradually passes into the bulk. The observed behavior in development and propagation of charge packets are explained according to these results. Thermally stimulated depolarization current measurements showed a non-distributed relaxation associated to the new trap levels on the surface of the wet samples.

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    Distinguishing signatures of determinism and stochasticity in spiking complex systems  Open access

     Aragoneses Aguado, Andres; Rubido, Nicolás; Tiana Alsina, Jordi; Torrent Serra, Maria Del Carmen; Masoller Alonso, Cristina
    Scientific reports
    Vol. 3, p. 1778-1-1778-5
    DOI: 10.1038/srep01778
    Date of publication: 2013-05-07
    Journal article

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  • Teaching engineering with autonomous learning tools: good practices in GRAPAU-RIMA

     Marce Nogue, Jordi; Salán Ballesteros, Mª Núria; Aragoneses Aguado, Andres; Bernat Maso, Ernest; Escrig Perez, Christian; Otero Calviño, Beatriz; Rupérez De Gracia, Elisa; Illescas Fernandez, Silvia
    Procedia - Social and behavioral sciences
    Vol. 46, p. 629-634
    DOI: 10.1016/j.sbspro.2012.05.175
    Date of publication: 2012-09-03
    Journal article

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  • Matemáticas 2: ESO: [propuesta didáctica]

     Albertí, Miquel; Aragoneses Aguado, Andres; Bancells, Antoni; Bosch, Albert; Frías Ruiz, Viky; García, Fernando; Hernandez Fernandez, Antonio; Luque Serrano, Bartolome; Martín Martín, Dorotea; Molero Aparicio, María; Andreu Rovira, Ricard; Sabater, Lluís; Salvador Alcaide, Adela; Ysern, Juan; Zuasti Soravilla, Nieves
    Date of publication: 2012
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  • Matemáticas 4A: ESO

     Albertí, Miquel; Aragoneses Aguado, Andres; Bancells, Antoni; García, Fernando; Hernandez Fernandez, Antonio; Luque Serrano, Bartolome; Andreu Rovira, Ricard; Sabater, Lluís; Ysern, Juan
    Date of publication: 2012
    Book

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  • Matemáticas 2: ESO

     Albertí, Miquel; Aragoneses Aguado, Andres; Bancells, Antoni; Bosch, Albert; Frías Ruiz, Viky; García, Fernando; Hernandez Fernandez, Antonio; Luque Serrano, Bartolome; Molero Aparicio, María; Andreu Rovira, Ricard; Sabater, Lluís; Salvador Alcaide, Adela; Ysern, Juan; Zuasti Soravilla, Nieves
    Date of publication: 2012
    Book

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  • Matemáticas 4A: ESO: [propuesta didáctica]

     Albertí, Miquel; Aragoneses Aguado, Andres; Bancells, Antoni; Bosch, A.; Frías, V.; García, Fernando; Hernandez Fernandez, Antonio; Luque, B.; Martín, D.; Molero, M.; Rovira, R. A.; Sabater, L.; Salvador, A.; Ysern, J. A.; Zuasti Soravilla, Nieves
    Date of publication: 2012
    Book

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  • Ordinal time-series analysis of low-frequency fluctuations in semiconductor lasers with optical feedback

     Aragoneses Aguado, Andres; Rubido, Nicolás; Sorrentino, T.; Tiana Alsina, Jordi; Torrent Serra, Maria Del Carmen; Masoller Alonso, Cristina
    Congreso de Física Estadística
    p. 66-
    Presentation's date: 2012-10-18
    Presentation of work at congresses

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  • Experimental study of the spiking activity of semiconductor lasers with time-delayed optical feedback

     Aragoneses Aguado, Andres; Rubido, Nicolás; Sorrentino, T.; Tiana Alsina, Jordi; Torrent Serra, Maria Del Carmen; Masoller Alonso, Cristina
    International Symposium on Nonlinear Theory and its Applications
    p. 64-
    Presentation's date: 2012-10-25
    Presentation of work at congresses

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  • Jornada de divulgación de relatividad del GIDF-RIMA: un congreso de ciencia como extensión del aula

     Aragoneses Aguado, Andres; Hernandez Fernandez, Antonio; Salán Ballesteros, Mª Núria
    Congrés Internacional de Docència Universitària i Innovació
    Presentation's date: 2012-07-03
    Presentation of work at congresses

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  • Nonlinear time-series analysis of low-frequency fluctuations in semiconductor lasers with optical feedback

     Aragoneses Aguado, Andres; Rubido, Nicolás; Sorrentino, T.; Tiana Alsina, Jordi; Torrent Serra, Maria Del Carmen; Masoller Alonso, Cristina
    European Optical Society Annual Meeting
    p. 40-
    Presentation's date: 2012-09-25
    Presentation of work at congresses

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  • Laboratorio de dinámica de láseres

     Masoller Alonso, Cristina; Torrent, M.C.; Garcia Ojalvo, Jorge; Bonatto, Cristian; Tiana Alsina, Jordi; Zamora Munt, Jordi; Aragoneses Aguado, Andres; Rubido, Nicolás
    Date: 2011-03-17
    Report

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  • Experimental study of different LFF regimes in semiconductor lasers with an external cavity

     Aragoneses Aguado, Andres; Zamora Munt, Jordi; Tiana Alsina, Jordi; Torrent Serra, Maria Del Carmen; Masoller Alonso, Cristina
    Congreso de Física Estadística
    Presentation's date: 2011-06-03
    Presentation of work at congresses

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  • Research activities of the group on nonlinear dynamics, nonlinear optics and lasers (DONLL) at the universitat politècnica de catalunya (Campus de Terrassa)

     Tiana Alsina, Jordi; Zamora Munt, Jordi; Nistor, Ioan Cristian; Roppo, Vito; Maigyte, Lina; Aragoneses Aguado, Andres; Khumar, N.P.; Martinez Gonzalez, Maria Cristina; Fernandez Soler, Juanjo; Serrat Jurado, Carles; Font Garcia, Josep Lluís; Herrero Simon, Ramon; Cojocaru, Crina Maria; Trull, Jose; Masoller Alonso, Cristina; Staliunas, Kestutis; Torrent Serra, Maria Del Carmen; Garcia Ojalvo, Jorge; Vilaseca Alavedra, Ramon
    Óptica pura y aplicada
    Vol. 44, num. 2, p. 219-225
    Date of publication: 2011-06
    Journal article

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  • Matemáticas 3: ESO

     Albertí, Miquel; Aragoneses Aguado, Andres; Bancells, Antoni; Bosch, Albert; Colera Cañas, Ana; García, Fernando; Hernandez Fernandez, Antonio; Luque Serrano, Bartolome; Martí Puig, Maria Dolors; Polo Usaola, Marta; Andreu Rovira, Ricard; Sabater, Lluís; Salvador Alcaide, Adela; Solanes Martínez, Frederic; Ysern, Juan
    Date of publication: 2011-03
    Book

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  • Matemàtiques 3: ESO

     Albertí, Miquel; Aragoneses Aguado, Andres; Bancells, Antoni; Bosch, Albert; Colera Cañas, Ana; García, Fernando; Hernandez Fernandez, Antonio; Luque Serrano, Bartolome; Martí Puig, Maria Dolors; Polo Usaola, Marta; Andreu Rovira, Ricard; Sabater, Lluís; Salvador Alcaide, Adela; Solanes Martínez, Frederic; Ysern, Juan
    Date of publication: 2011-03
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  • Matemáticas 1: ESO

     Albertí, Miquel; Aragoneses Aguado, Andres; Bancells, Antoni; Bosch, Albert; Frías Ruiz, Viky; García, Fernando; Hernandez Fernandez, Antonio; Luque Serrano, Bartolome; Molero Aparicio, María; Andreu Rovira, Ricard; Sabater, Lluís; Salvador Alcaide, Adela; Ysern, Juan; Zuasti Soravilla, Nieves
    Date of publication: 2011-03
    Book

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  • Matemàtiques 1: ESO

     Albertí, Miquel; Aragoneses Aguado, Andres; Bancells, Antoni; Bosch, Albert; Frías Ruiz, Viky; García, Fernando; Hernandez Fernandez, Antonio; Luque Serrano, Bartolome; Molero Aparicio, María; Andreu Rovira, Ricard; Sabater, Lluís; Salvador Alcaide, Adela; Ysern, Juan; Zuasti Soravilla, Nieves
    Date of publication: 2011-03
    Book

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  • Matemáticas 1: ESO

     Albertí, Miquel; Aragoneses Aguado, Andres; Bancells, Antoni; Bosch, Albert; García, Fernando; Luque Serrano, Bartolome; Hernandez Fernandez, Antonio; Andreu Rovira, Ricard; Sabater, Lluís; Ysern, Juan
    Date of publication: 2011-01-04
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  • Experimental study of different LFF regimes in semicondutor lasers with an external cavity

     Aragoneses Aguado, Andres; Zamora Munt, Jordi; Tiana Alsina, Jordi; Rubido, Nicolás; Masoller Alonso, Cristina; Torrent, M. C.
    Congreso de Física Estadística
    p. P12-
    Presentation's date: 2011-06-03
    Presentation of work at congresses

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  • PROPIETATS DINÀMIQUES I NO LINIALS DE MATERIALS I SITEMES FOTÒNICS, ELÈCTRICS I BIOLÒGICS

     Roppo, Vito; Pons Rivero, Antonio Javier; De Sancristobal Alonso, Belen; Espinar Calvo, Maria Lorena; Zamora Munt, Jordi; Tiana Alsina, Jordi; Sellarès González, Jordi; Font Garcia, Josep Lluís; Vilaseca Alavedra, Ramon; Cojocaru, Crina Maria; Aragoneses Aguado, Andres; Òrrit Prat, Jordi; Torrent Serra, Maria Del Carmen; Herrero Simon, Ramon; Staliunas, Kestutis; Trull, Jose; Belana Punseti, Juan; Masoller Alonso, Cristina; Mudarra Lopez, Miguel; Cañadas Lorenzo, Juan Carlos; Domedel Puig, Nuria; Diego Vives, Jose Antonio; Nistor, Ioan Cristian; Garcia Ojalvo, Jorge
    Competitive project

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  • Study of packed-like space charge formation in LDPE sheets under DC electric field

     Lebrato Gonzalez, Alexander; Diego Vives, Jose Antonio; Cañadas Lorenzo, Juan Carlos; Aragoneses Aguado, Andres
    Date: 2009-07-15
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    Study of dispersive mobility in polyimide by surface voltage decay measurements  Open access

     Aragoneses Aguado, Andres; Mudarra Lopez, Miguel; Belana Punseti, Juan; Diego Vives, Jose Antonio
    Polymer
    Vol. 49, num. 10, p. 2440-2443
    DOI: doi:10.1016/j.polymer.2008.03.037
    Date of publication: 2008-05
    Journal article

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    In order to study charge trapping and transport in polyimide, we have submitted samples of Kapton HN to corona charging and measured its surface potential decay with an electrostatic voltmeter. We propose a two terms mobility to explain the experimental data: a non dispersive contribution based on Toomer and Lewis model added to a dispersive process, which is associated with the disordered structure of the material. The non-dispersive model alone did not fit well to the data for short times, but our assumption makes the theoretical expresion fit succesfully to the experimental data. Some important parameters related to the charge transport properties of the material are determined and discussed.

  • Dispersive mobility in polyimide by surface voltage decay measurements

     Aragoneses Aguado, Andres; Mudarra Lopez, Miguel; Belana Punseti, Juan; Diego Vives, Jose Antonio
    Date: 2007-07-09
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  • TSDC study of the glass transition: correlation with calorimetric data

     Diego Vives, Jose Antonio; Sellarès González, Jordi; Aragoneses Aguado, Andres; Mudarra Lopez, Miguel; Cañadas Lorenzo, Juan Carlos; Belana Punseti, Juan
    Journal of physics D. Applied physics
    Vol. 40, num. 4, p. 1138-1145
    Date of publication: 2007-02
    Journal article

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  • Dipolar alpha relaxation modelization in PET by TSDC and DSC

     Diego Vives, Jose Antonio; Sellarès González, Jordi; Belana Punseti, Juan; Cañadas Lorenzo, Juan Carlos; Mudarra Lopez, Miguel; Aragoneses Aguado, Andres; Òrrit Prat, Jordi
    Date: 2006-07-03
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