Experimental characterization of DFB and FP chaotic lasers with strong incoherent optical feedback (original) (raw)
Related papers
Experimental Evidence of Chaotic Resonance in Semiconductor Laser
Baghdad Science Journal, 2021
In this paper, an experimental study has been conducted regarding the indication of resonance in chaotic semiconductor laser. Resonant perturbations are effective for harnessing nonlinear oscillators for various applications such as inducing chaos and controlling chaos. Interesting results have been obtained regarding to the effect of the chaotic resonance by adding the frequency on the systems. The frequency changes nonlinear dynamical system through a critical value, there is a transition from a periodic attractor to a strange attractor. The amplitude has a very relevant impact on the system, resulting in an optimal resonance response for appropriate values related to correlation time. The chaotic system becomes regular under a moderate frequencies or amplitudes. These dynamics of the laser output are analyzed by time series, FFT and bifurcation diagram as a result.
Chaotic transitions and low-frequency fluctuations in semiconductor lasers with optical feedback
Physica D: Nonlinear Phenomena, 2000
This paper examines the dynamical origin of low-frequency fluctuations (LFFs) in semiconductor lasers subject to timedelayed optical feedback. In particular, we study chaotic transitions leading to the onset of LFFs by numerical integration of Lang-Kobayashi equations for a laser pumped near threshold. We construct a bifurcation analysis scheme that enables the classification of the different operation regimes of the laser. We use the scheme to study the coexistence of the LFFs and stable emission on the maximum gain mode (MGM), which was the subject of recent experiments [T. Heil, I. Fischer, W. Elsäßer, Phys. Rev. A 60 (1999) 634]. Our computations suggest that as the feedback level increases, the regime of sustained LFFs alternates with regions of transient LFFs, where the laser can achieve stabilization on the MGM. Exploration of the parameter space reveals strong dependence of the structure of the LFF dynamics and the coexistence regime on the value of the linewidth enhancement factor. : S 0 1 6 7 -2 7 8 9 ( 0 0 ) 0 0 1 0 7 -X
Physical Review E, 2004
We investigated chaotic dynamics in a microchip three-mode solid-state laser subjected to frequency-shifted optical feedback. When the frequency shift was tuned to harmonic frequencies of the relaxation oscillation, a bifurcation from a periodic sustained relaxation oscillation ("soft-mode") state to a chaotic spiking ("hardmode") state via a chaotic itinerancy was observed as the feedback intensity was increased. Dynamic characterizations of modal interplay and self-induced switching between the soft-and hard-mode chaotic states over times (i.e., chaotic itinerancy) were carried out by the information circulation analysis and joint time-frequency analysis of long-term experimental time series. Drastic changes in information transfer rates among oscillating modes and occasional frequency locking among periodicities of two chaotic states associated with switchings were identi ed in chaotic itinerancy. Essential dynamical behaviors were reproduced by numerical simulation.
Experimental evidence of Phase Control method in chaotic Semiconductor Laser
Iraqi Journal of Science, 2019
we study how to control the dynamics of excitable systems by using the phase control technique.We study how to control nonlinear semiconductor laser dynamics with optoelectronic feedback using the phase control method. The phase control method uses the phase difference between a small.added frequenc y and the main driving frequency to suppress chaos, which leads to various periodic orbits. The experimental studying for the evaluation of chaos modulation behavior are considered in two conditions, the first condition, when one frequency of the external perturbation is varied, secondly, when two of these perturbations are changed. The chaotic system becomes regular under one frequency or two frequencies, But in two frequencies ,phase control showed an excellent ability to maintain regular behavior in chaotic window and reexcite chaotic behavior when destroyed. This dynamics of the laser output are analyzed by time series and bifurcation diagram.
Experimental route to chaos of an external-cavity semiconductor laser
Physical Review A, 2015
We report experimental bifurcation diagrams of a semiconductor laser, biased well above threshold, subjected to external optical feedback. As feedback is increased, we see a quasiperiodic route to chaos interrupted by several windows of periodicity corresponding to limit cycles, differing in frequency by multiples of the external-cavity free-spectral range that have developed around external-cavity modes (ECMs) whose frequency is slightly larger than that of the solitary laser. Successive windows correspond to the transition between two limit cycles either on the same or neighboring ECMs. For larger feedback, the laser operates in a chaotic regime around numerous negatively shifted external-cavity modes. These experimental observations detail the bifurcations leading to fully developed chaos in this system, and further provide detailed insight on the standard theoretical framework applied to these lasers.
Synchronization by injection of common chaotic signal in semiconductor lasers with optical feedback
Optics Express, 2009
We investigate the dynamics of two semiconductor lasers with separate optical feedback when they are driven by a common signal injected from a chaotic laser under the condition of non-identical drive and response. We experimentally and numerically show conditions under which the outputs of the two lasers can be highly correlated with each other even though the correlation with the drive signal is low. In particular, the effects of the phase of the feedback light on the correlation characteristics are described. The maximum correlation between the two response lasers is obtained when the phase of the feedback light is matched between the two response lasers, while the minimum correlation is observed when the difference in the optical phase is π. On the other hand, the correlation between the drive and response is not sensitive to the phase of the feedback light, unlike the previously studied case of identical drive and response. We numerically examine the difference between the maximum and minimum cross correlations over a wide range of parameters, and show that it is largest when there is a balance between the injection strength and the feedback strength.
Chaos modulation in semiconductor laser with optoelectronic feedback
IOP Conference Series: Materials Science and Engineering
The experimental and numerical study of chaos modulation will be presented in two stats, first, when the frequency of the external perturbation is varied, secondly, when the amplitude of this perturbation is changed. The dynamics of the laser output are analyzed by Fast Fourier Transformation, attractors and bifurcation Diagram. Some frequencies could be hidden other appeared, when the frequencies are hidden, the communication link considered as secure.
Optics Letters, 2004
We demonstrate experimental chaos synchronization between two chaotic semiconductor lasers subjected to polarization-rotated optical feedback and unidirectional injection. This system allows high-quality synchronization to be obtained between dissimilar lasers in a wide range of chaotic operating regimes. Another feature of this system is its operation at high characteristic frequencies, taking advantage of all-optical implementation. Time series and RF spectra showing synchronization are confirmed by high correlation coefficients in excess of 0.85.
THE NONLINEAR GAIN AND THE ROUTE TO CHAOS IN SEMICONDUCTOR LASER WITH OPTICAL FEEDBACK
TJPRC, 2013
Influence of nonlinear gain on the operations and route-to-chaos of semiconductor laser subject to wide range of optical feedback are investigated. The simulation is performed based on numerical solution of an improved time delay model, which is applicable under any arbitrary strength of feedback. The route-to-chaos and the operations of laser are classified in terms of the bifurcation diagrams of the photon number at each feedback rate. The simulation results show that, inclusion of nonlinear gain in the rate equations cause significant changes in the route-to-chaos and operations of the laser. The value of the feedback rate at which the transition from continues wave to periodic oscillation or chaos state occur increase, as the intensity of the nonlinear gain is increased. Under strong feedback and by increasing the values of the nonlinear gain the operation of the laser changes from chaos operation to periodic oscillation or continues wave operation depending on feedback strength
High chaotic spiking rate in a closed loop semiconductor laser with optical feedback
Results in Physics, 2016
We investigate experimentally and numerically the existence of fast chaotic spiking in the dynamics of a semiconductor laser with ac-coupled optical feedback. The observed dynamics is chaotic in the explored range of both bias current optical feedback strength. The effects of a modulation applied to the bias current are also investigated. We eventually indicate that the observed chaotic dynamics is a good candidate to hide information to satisfy secure communications.