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http://hdl.handle.net/2117/3215
Fri, 18 Apr 2014 11:22:39 GMT2014-04-18T11:22:39Zwebmaster.bupc@upc.eduUniversitat Politècnica de Catalunya. Servei de Biblioteques i DocumentaciónoTransverse-mode dynamics in vertical-cavity surface-emitting lasers with optical feedback
http://hdl.handle.net/2117/22288
Title: Transverse-mode dynamics in vertical-cavity surface-emitting lasers with optical feedback
Authors: Torre, Maria Susana; Masoller Alonso, Cristina; Mandel, Paul
Abstract: We study the transverse-mode dynamics of vertical-cavity surface-emitting lasers with weak optical feedback. We use a model that takes into account the spatial dependence of the transverse modes and of two carrier density profiles, associated with confined carriers in the quantum well region of the laser and unconfined carriers in the barrier region. Optical feedback is included as in the Lang-Kobayashi model. We find that for adequate parameter values antiphase dynamics occurs. As the injection current varies, the antiphase dynamics is destroyed through a sequence of periodic mixed states leading to in-phase dynamics. In these mixed states there are time intervals in which the modes are in phase, followed by time intervals in which they are in antiphase. We study the origin of the antiphase dynamics, assessing the role of the different spatial profiles. We show that the competition between the different profiles leads to the observed antiphase behavior.Wed, 19 Mar 2014 14:40:48 GMThttp://hdl.handle.net/2117/222882014-03-19T14:40:48ZTorre, Maria Susana; Masoller Alonso, Cristina; Mandel, PaulnoWe study the transverse-mode dynamics of vertical-cavity surface-emitting lasers with weak optical feedback. We use a model that takes into account the spatial dependence of the transverse modes and of two carrier density profiles, associated with confined carriers in the quantum well region of the laser and unconfined carriers in the barrier region. Optical feedback is included as in the Lang-Kobayashi model. We find that for adequate parameter values antiphase dynamics occurs. As the injection current varies, the antiphase dynamics is destroyed through a sequence of periodic mixed states leading to in-phase dynamics. In these mixed states there are time intervals in which the modes are in phase, followed by time intervals in which they are in antiphase. We study the origin of the antiphase dynamics, assessing the role of the different spatial profiles. We show that the competition between the different profiles leads to the observed antiphase behavior.Delayed coupling of logistic maps
http://hdl.handle.net/2117/22274
Title: Delayed coupling of logistic maps
Authors: Masoller Alonso, Cristina; Cavalcante, Hugo; Rios Leite, José R.
Abstract: We study the synchronization of logistic maps in a one-way coupling configuration. The master system is coupled to the slave system with a delay n1, and the slave is a delayed logistic map with a delay n2. We show that when the slave system has no delay (n2=0), perfectly synchronized solutions exist for strong enough coupling. In these solutions the slave variable y is retarded with respect to the master variable x with a retardation equal to the delay of the coupling [y(i+n1)=x(i)]. When n2¿0, a regime of generalized synchronization is observed, where y(i+n1) is synchronized with x(i), but not completely, since the master and the slave systems obey different maps. We introduced a similarity function as an indicator of the degree of synchronization and, using a noisy master source, distinguished synchronization from noise-induced correlations.Tue, 18 Mar 2014 17:39:59 GMThttp://hdl.handle.net/2117/222742014-03-18T17:39:59ZMasoller Alonso, Cristina; Cavalcante, Hugo; Rios Leite, José R.noWe study the synchronization of logistic maps in a one-way coupling configuration. The master system is coupled to the slave system with a delay n1, and the slave is a delayed logistic map with a delay n2. We show that when the slave system has no delay (n2=0), perfectly synchronized solutions exist for strong enough coupling. In these solutions the slave variable y is retarded with respect to the master variable x with a retardation equal to the delay of the coupling [y(i+n1)=x(i)]. When n2¿0, a regime of generalized synchronization is observed, where y(i+n1) is synchronized with x(i), but not completely, since the master and the slave systems obey different maps. We introduced a similarity function as an indicator of the degree of synchronization and, using a noisy master source, distinguished synchronization from noise-induced correlations.Polarization dynamics in vertical-cavity surface-emitting lasers with optical feedback through a quarter-wave plate
http://hdl.handle.net/2117/22273
Title: Polarization dynamics in vertical-cavity surface-emitting lasers with optical feedback through a quarter-wave plate
Authors: Masoller Alonso, Cristina; Abraham, N. B.
Abstract: Square-wave switching of the intensities of the orthogonal linearly polarized components of the output of a vertical-cavity surface-emitting laser(VCSEL) found previously in experiments with polarization-changing optical feedback, is not found in rate equation models incorporating only birefringence and gain anisotropy, but is found in the model for VCSELs developed by San Miguel, Feng, and Moloney [M. San Miguel, Q. Feng, and J. V. Moloney, Phys. Rev. A 52, 1729 (1995)]. The dynamics is sensitive to both the feedback strength and the relaxation rate of the magnetization in the quantum well sublevels.Tue, 18 Mar 2014 17:19:17 GMThttp://hdl.handle.net/2117/222732014-03-18T17:19:17ZMasoller Alonso, Cristina; Abraham, N. B.noSquare-wave switching of the intensities of the orthogonal linearly polarized components of the output of a vertical-cavity surface-emitting laser(VCSEL) found previously in experiments with polarization-changing optical feedback, is not found in rate equation models incorporating only birefringence and gain anisotropy, but is found in the model for VCSELs developed by San Miguel, Feng, and Moloney [M. San Miguel, Q. Feng, and J. V. Moloney, Phys. Rev. A 52, 1729 (1995)]. The dynamics is sensitive to both the feedback strength and the relaxation rate of the magnetization in the quantum well sublevels.Coexistence of attractors in a laser diode with optical feedback from a large external cavity
http://hdl.handle.net/2117/22270
Title: Coexistence of attractors in a laser diode with optical feedback from a large external cavity
Authors: Masoller Alonso, Cristina
Abstract: The coexistence of several attractors in the coherent collapsed state of a laser diode with optical feedback is investigated. These attractors are unstable tori that bifurcate from different external cavity modes. As the feedback rate is increased, these tori undergo different types of quasiperiodic routes, such as frequency locking, period doubling, or the appearance of a third incommensurate frequency. In the fully developed coherent collapsed state, the tori are all unstable, and the phenomenon of intermittence appears. Lyapunov exponent calculations demonstrate that this state presents hyperchaotic and high-dimensional dynamics. These results are explained qualitatively in terms of the multiattractor behavior found.Tue, 18 Mar 2014 16:52:28 GMThttp://hdl.handle.net/2117/222702014-03-18T16:52:28ZMasoller Alonso, CristinanoThe coexistence of several attractors in the coherent collapsed state of a laser diode with optical feedback is investigated. These attractors are unstable tori that bifurcate from different external cavity modes. As the feedback rate is increased, these tori undergo different types of quasiperiodic routes, such as frequency locking, period doubling, or the appearance of a third incommensurate frequency. In the fully developed coherent collapsed state, the tori are all unstable, and the phenomenon of intermittence appears. Lyapunov exponent calculations demonstrate that this state presents hyperchaotic and high-dimensional dynamics. These results are explained qualitatively in terms of the multiattractor behavior found.Different regimes of low-frequency fluctuations in vertical-cavity surface-emitting lasers
http://hdl.handle.net/2117/22263
Title: Different regimes of low-frequency fluctuations in vertical-cavity surface-emitting lasers
Authors: Sciamanna, Marc; Masoller Alonso, Cristina; Abraham, N. B.; Rogister, F.; Megret, P.; Blondel, M.
Abstract: A numerical study of vertical-cavity surface-emitting lasers with optical feedback demonstrates the existence of two different types of low-frequency fluctuations (LFFs). The competition of two equally dominant polarization modes characterizes one type of LFF, while the other type is characterized by power drops in a dominant polarization mode and power bursts in the orthogonal depressed mode. We characterize and compare these two types of LFFs on the basis of their polarization properties and their dependency on the laser parameters. We show furthermore that a transition is possible from one type of LFF to the other, depending on the values of the linear anisotropies of the vertical-cavity surface-emitting laser cavity.Tue, 18 Mar 2014 15:56:38 GMThttp://hdl.handle.net/2117/222632014-03-18T15:56:38ZSciamanna, Marc; Masoller Alonso, Cristina; Abraham, N. B.; Rogister, F.; Megret, P.; Blondel, M.noA numerical study of vertical-cavity surface-emitting lasers with optical feedback demonstrates the existence of two different types of low-frequency fluctuations (LFFs). The competition of two equally dominant polarization modes characterizes one type of LFF, while the other type is characterized by power drops in a dominant polarization mode and power bursts in the orthogonal depressed mode. We characterize and compare these two types of LFFs on the basis of their polarization properties and their dependency on the laser parameters. We show furthermore that a transition is possible from one type of LFF to the other, depending on the values of the linear anisotropies of the vertical-cavity surface-emitting laser cavity.Delay-induced synchronization phenomena in an array of globally coupled logistic maps
http://hdl.handle.net/2117/22262
Title: Delay-induced synchronization phenomena in an array of globally coupled logistic maps
Authors: Martí, A. C.; Masoller Alonso, Cristina
Abstract: We study the synchronization of a linear array of globally coupled identical logistic maps. We consider a time-delayed coupling that takes into account the finite velocity of propagation of the interactions. We find globally synchronized states in which the elements of the array evolve along a periodic orbit of the uncoupled map, while the spatial correlation along the array is such that an individual map sees all other maps in his present, current, state. For values of the nonlinear parameter such that the uncoupled maps are chaotic, time-delayed mutual coupling suppresses the chaotic behavior by stabilizing a periodic orbit that is unstable for the uncoupled maps. The stability analysis of the synchronized state allows us to calculate the range of the coupling strength in which global synchronization can be obtained.Tue, 18 Mar 2014 15:33:10 GMThttp://hdl.handle.net/2117/222622014-03-18T15:33:10ZMartí, A. C.; Masoller Alonso, CristinanoWe study the synchronization of a linear array of globally coupled identical logistic maps. We consider a time-delayed coupling that takes into account the finite velocity of propagation of the interactions. We find globally synchronized states in which the elements of the array evolve along a periodic orbit of the uncoupled map, while the spatial correlation along the array is such that an individual map sees all other maps in his present, current, state. For values of the nonlinear parameter such that the uncoupled maps are chaotic, time-delayed mutual coupling suppresses the chaotic behavior by stabilizing a periodic orbit that is unstable for the uncoupled maps. The stability analysis of the synchronized state allows us to calculate the range of the coupling strength in which global synchronization can be obtained.Comparison of two types of synchronization of external-cavity semiconductor lasers
http://hdl.handle.net/2117/22260
Title: Comparison of two types of synchronization of external-cavity semiconductor lasers
Authors: Locquet, A.; Masoller Alonso, Cristina; Megret, P.; Blondel, M.
Abstract: We study numerically the synchronization of external-cavity semiconductor lasers in a master–slave configuration, based on a Lang–Kobayashi-type model. Depending on the feedback and coupling strengths, the slave laser synchronizes with the injected optical field or with the injected field but lags in time. We show that these two types of synchronization present different robustness with respect to the noise, frequency detuning, and current modulation of the master laser.
Description: Missatge de l'editorial: "This paper was published in Optical letters 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/ol/abstract.cfm?uri=ol-27-1-31. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law."Tue, 18 Mar 2014 15:12:45 GMThttp://hdl.handle.net/2117/222602014-03-18T15:12:45ZLocquet, A.; Masoller Alonso, Cristina; Megret, P.; Blondel, M.noWe study numerically the synchronization of external-cavity semiconductor lasers in a master–slave configuration, based on a Lang–Kobayashi-type model. Depending on the feedback and coupling strengths, the slave laser synchronizes with the injected optical field or with the injected field but lags in time. We show that these two types of synchronization present different robustness with respect to the noise, frequency detuning, and current modulation of the master laser.Modeling bidirectionally coupled single-mode semiconductor lasers
http://hdl.handle.net/2117/22258
Title: Modeling bidirectionally coupled single-mode semiconductor lasers
Authors: Mulet, J.; Masoller Alonso, Cristina; Mirasso, C. R.
Abstract: We develop a dynamical model suitable for the description of two mutually coupled semiconductor lasers in a face-to-face configuration. Our study considers the propagation of the electric field along the compound system as well as the evolution of the carrier densities within each semiconductor laser. Mutual injection, passive optical feedback, and multiple reflections are accounted for in this framework, although under weak to moderate coupling conditions. We systematically describe the effect of the coupling strength on the spectrum of monochromatic solutions and on the respective dynamical behavior. By assuming single-longitudinal-mode operation, weak mutual coupling and slowly varying approximation, the dynamical model can be reduced to rate equations describing the mutual injection from one laser to its counterpart and vice versa. A good agreement between the complete and simplified models is found for small coupling. For larger coupling, higher-order terms lead to a smaller threshold reduction, reflected itself in the spectrum of the monochromatic solutions and in the dynamics of the optical power.Tue, 18 Mar 2014 15:00:46 GMThttp://hdl.handle.net/2117/222582014-03-18T15:00:46ZMulet, J.; Masoller Alonso, Cristina; Mirasso, C. R.noWe develop a dynamical model suitable for the description of two mutually coupled semiconductor lasers in a face-to-face configuration. Our study considers the propagation of the electric field along the compound system as well as the evolution of the carrier densities within each semiconductor laser. Mutual injection, passive optical feedback, and multiple reflections are accounted for in this framework, although under weak to moderate coupling conditions. We systematically describe the effect of the coupling strength on the spectrum of monochromatic solutions and on the respective dynamical behavior. By assuming single-longitudinal-mode operation, weak mutual coupling and slowly varying approximation, the dynamical model can be reduced to rate equations describing the mutual injection from one laser to its counterpart and vice versa. A good agreement between the complete and simplified models is found for small coupling. For larger coupling, higher-order terms lead to a smaller threshold reduction, reflected itself in the spectrum of the monochromatic solutions and in the dynamics of the optical power.Anticipating the response of excitable systems driven by random forcing
http://hdl.handle.net/2117/22079
Title: Anticipating the response of excitable systems driven by random forcing
Authors: Ciszak, M.; Calvo, O.; Masoller Alonso, Cristina; Mirasso, C. R.; Toral, R.
Abstract: We study the regime of anticipated synchronization in unidirectionally coupled model neurons subject to a common external aperiodic forcing that makes their behavior unpredictable. We show numerically and by analog hardware electronic circuits that, under appropriate coupling conditions, the pulses fired by the slave neuron anticipate (i.e., predict) the pulses fired by the master neuron. This anticipated synchronization occurs even when the common external forcing is white noise.Fri, 14 Mar 2014 15:15:19 GMThttp://hdl.handle.net/2117/220792014-03-14T15:15:19ZCiszak, M.; Calvo, O.; Masoller Alonso, Cristina; Mirasso, C. R.; Toral, R.noWe study the regime of anticipated synchronization in unidirectionally coupled model neurons subject to a common external aperiodic forcing that makes their behavior unpredictable. We show numerically and by analog hardware electronic circuits that, under appropriate coupling conditions, the pulses fired by the slave neuron anticipate (i.e., predict) the pulses fired by the master neuron. This anticipated synchronization occurs even when the common external forcing is white noise.Stability and dynamical properties of the coexisting attractors of an external-cavity semiconductor laser
http://hdl.handle.net/2117/22077
Title: Stability and dynamical properties of the coexisting attractors of an external-cavity semiconductor laser
Authors: Masoller Alonso, Cristina; Abraham, N. B.
Abstract: Coexisting attractors, which arise from different external-cavity modes of the same longitudinal mode of the solitary laser, retain distinct stability properties, particularly when the laser is biased far above threshold and subjected to moderately strong optical feedback from a distant reflector. When the laser is modeled by the Lang and Kobayashi equations with additional gain nonlinearity, the dynamics is limited to external-cavity attractors that develop from the external-cavity modes which have a positive but not too large frequency shift with respect to the solitary laser emission frequency ¿0. Although relaxation oscillations about these external-cavity modes are the first to become undamped as the feedback intensity increases, the attractors that arise from these modes remain stable over the largest range of feedback strengths. Stronger feedback destabilizes the individual attractors, creating new solutions which form from their ruins. At the beginning of the merging, the attractor ruins are not equally visited; the most visited ruins are those of the attractors last destabilized. We explore and explain these results by examining the dynamics of the laser when operating on a single external-cavity attractor.Fri, 14 Mar 2014 14:55:52 GMThttp://hdl.handle.net/2117/220772014-03-14T14:55:52ZMasoller Alonso, Cristina; Abraham, N. B.noCoexisting attractors, which arise from different external-cavity modes of the same longitudinal mode of the solitary laser, retain distinct stability properties, particularly when the laser is biased far above threshold and subjected to moderately strong optical feedback from a distant reflector. When the laser is modeled by the Lang and Kobayashi equations with additional gain nonlinearity, the dynamics is limited to external-cavity attractors that develop from the external-cavity modes which have a positive but not too large frequency shift with respect to the solitary laser emission frequency ¿0. Although relaxation oscillations about these external-cavity modes are the first to become undamped as the feedback intensity increases, the attractors that arise from these modes remain stable over the largest range of feedback strengths. Stronger feedback destabilizes the individual attractors, creating new solutions which form from their ruins. At the beginning of the merging, the attractor ruins are not equally visited; the most visited ruins are those of the attractors last destabilized. We explore and explain these results by examining the dynamics of the laser when operating on a single external-cavity attractor.Experimental investigation of a bistable system in the presence of noise and delay
http://hdl.handle.net/2117/22073
Title: Experimental investigation of a bistable system in the presence of noise and delay
Authors: Houlihan, J.; Goulding, D.; Busch, T.; Masoller Alonso, Cristina; Huyet, G.
Abstract: We experimentally analyze the behavior of a non-Markovian bistable system with noise, using a vertical cavity surface emitting laser with time-delayed optoelectronic feedback. The effects of the delayed feedback are observed in the probability distribution of the residence times of the two orthogonal polarization states, and in the polarization-resolved power spectrum. They agree well with recent theoretical predictions based on a two-state model with transition rates depending on an earlier state of the system. We also observe experimentally and explain theoretically that the residence time probability distribution deviates from exponential decay for residence times close to (and smaller than) the delay time.Fri, 14 Mar 2014 14:47:51 GMThttp://hdl.handle.net/2117/220732014-03-14T14:47:51ZHoulihan, J.; Goulding, D.; Busch, T.; Masoller Alonso, Cristina; Huyet, G.noWe experimentally analyze the behavior of a non-Markovian bistable system with noise, using a vertical cavity surface emitting laser with time-delayed optoelectronic feedback. The effects of the delayed feedback are observed in the probability distribution of the residence times of the two orthogonal polarization states, and in the polarization-resolved power spectrum. They agree well with recent theoretical predictions based on a two-state model with transition rates depending on an earlier state of the system. We also observe experimentally and explain theoretically that the residence time probability distribution deviates from exponential decay for residence times close to (and smaller than) the delay time.Low-frequency fluctuations in vertical-cavity surface-emitting semiconductor lasers with optical feedback
http://hdl.handle.net/2117/22071
Title: Low-frequency fluctuations in vertical-cavity surface-emitting semiconductor lasers with optical feedback
Authors: Masoller Alonso, Cristina; Abraham, N. B.
Abstract: We study the dynamics of a vertical-cavity surface-emitting laser operating near threshold and with isotropic optical feedback, using a model developed by San Miguel, Feng, and Moloney [Phys. Rev. A 52, 1728 (1995)]. The model couples the polarization state of the electric field to the semiconductor medium by including the magnetic sublevels of the conduction and valence bands in the quantum wells. The laser dynamics depend significantly on the value of the relaxation rate, ¿s, of the material magnetization. For low relaxation rates the time-averaged intensity abruptly drops to zero and then recovers, a phenomenon revealed to be a sequence of picosecond pulses. The dropouts are similar to those occurring in conventional semiconductor lasers, but underlying the dropouts there is an antiphase competition between the time-averaged orthogonal linearly polarized components of the electric field. For large values of the relaxation rate, the dropouts tend to disappear and the time-averaged intensity is nearly constant.Fri, 14 Mar 2014 14:15:05 GMThttp://hdl.handle.net/2117/220712014-03-14T14:15:05ZMasoller Alonso, Cristina; Abraham, N. B.noWe study the dynamics of a vertical-cavity surface-emitting laser operating near threshold and with isotropic optical feedback, using a model developed by San Miguel, Feng, and Moloney [Phys. Rev. A 52, 1728 (1995)]. The model couples the polarization state of the electric field to the semiconductor medium by including the magnetic sublevels of the conduction and valence bands in the quantum wells. The laser dynamics depend significantly on the value of the relaxation rate, ¿s, of the material magnetization. For low relaxation rates the time-averaged intensity abruptly drops to zero and then recovers, a phenomenon revealed to be a sequence of picosecond pulses. The dropouts are similar to those occurring in conventional semiconductor lasers, but underlying the dropouts there is an antiphase competition between the time-averaged orthogonal linearly polarized components of the electric field. For large values of the relaxation rate, the dropouts tend to disappear and the time-averaged intensity is nearly constant.Distribution of residence times of time-delayed bistable systems driven by noise
http://hdl.handle.net/2117/22056
Title: Distribution of residence times of time-delayed bistable systems driven by noise
Authors: Masoller Alonso, Cristina
Abstract: I study bistable time-delayed feedback systems driven by noise. Based on a two-state model with transition rates depending on the earlier state of the system I calculate analytically the residence-time distribution function. I show that the distribution function has a detailed structure, reflective of the effect of the feedback. By using an adequate indicator I give evidence of resonant behavior in dependence on the noise level. I also predict that this feedback-induced effect might be observed in two well-known optical bistable systems.Thu, 13 Mar 2014 17:56:04 GMThttp://hdl.handle.net/2117/220562014-03-13T17:56:04ZMasoller Alonso, CristinanoI study bistable time-delayed feedback systems driven by noise. Based on a two-state model with transition rates depending on the earlier state of the system I calculate analytically the residence-time distribution function. I show that the distribution function has a detailed structure, reflective of the effect of the feedback. By using an adequate indicator I give evidence of resonant behavior in dependence on the noise level. I also predict that this feedback-induced effect might be observed in two well-known optical bistable systems.Synchronization regimes of optical-feedback-induced chaos in unidirectionally coupled semiconductor lasers
http://hdl.handle.net/2117/22054
Title: Synchronization regimes of optical-feedback-induced chaos in unidirectionally coupled semiconductor lasers
Authors: Locquet, A.; Masoller Alonso, Cristina; Mirasso, C. R.
Abstract: We numerically study the synchronization of two unidirectionally coupled single-mode semiconductor lasers in a master-slave configuration. The master laser is an external-cavity laser that operates in a chaotic regime while for the slave laser we consider two configurations. In the first one, the slave laser is also an external-cavity laser, subjected to, its own optical feedback and the optical injection from the master laser. In the second one, the slave laser is subject only to the optical injection from the master laser. Depending on the operating conditions the synchronization between the two lasers, whenever it exists, can be either isochronous or anticipated. We perform a detailed study of the parameter regions in which these synchronization regimes occur and how small variations of parameter yield one or the other type of synchronization or an unsynchronized regime.Thu, 13 Mar 2014 17:32:32 GMThttp://hdl.handle.net/2117/220542014-03-13T17:32:32ZLocquet, A.; Masoller Alonso, Cristina; Mirasso, C. R.noWe numerically study the synchronization of two unidirectionally coupled single-mode semiconductor lasers in a master-slave configuration. The master laser is an external-cavity laser that operates in a chaotic regime while for the slave laser we consider two configurations. In the first one, the slave laser is also an external-cavity laser, subjected to, its own optical feedback and the optical injection from the master laser. In the second one, the slave laser is subject only to the optical injection from the master laser. Depending on the operating conditions the synchronization between the two lasers, whenever it exists, can be either isochronous or anticipated. We perform a detailed study of the parameter regions in which these synchronization regimes occur and how small variations of parameter yield one or the other type of synchronization or an unsynchronized regime.Noise-induced resonance in delayed feedback systems
http://hdl.handle.net/2117/22048
Title: Noise-induced resonance in delayed feedback systems
Authors: Masoller Alonso, Cristina
Abstract: We study the influence of noise in the dynamics of a laser with optical feedback. For appropriate choices of the feedback parameters, several attractors coexist, and large enough noise induces jumps among the attractors. Based on the residence times probability density, it is shown that with increasing noise the dynamics of attractor jumping exhibits a resonant behavior, which is due to the interplay of noise and delayed feedback. It is also shown that this type of resonance is not specific to the model equations used, since it also occurs in other delay differential equations.Thu, 13 Mar 2014 16:40:08 GMThttp://hdl.handle.net/2117/220482014-03-13T16:40:08ZMasoller Alonso, CristinanoWe study the influence of noise in the dynamics of a laser with optical feedback. For appropriate choices of the feedback parameters, several attractors coexist, and large enough noise induces jumps among the attractors. Based on the residence times probability density, it is shown that with increasing noise the dynamics of attractor jumping exhibits a resonant behavior, which is due to the interplay of noise and delayed feedback. It is also shown that this type of resonance is not specific to the model equations used, since it also occurs in other delay differential equations.