Controlling chaotic fluctuations in semiconductor laser arrays (original) (raw)

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

Route to Chaos in a Ring of Three Unidirectionally-Coupled Semiconductor Lasers

IEEE Photonics Technology Letters, 2012

Complex dynamics of a ring of three unidirectionally-coupled semiconductor lasers are studied with respect to the coupling strength. While uncoupled, the lasers stay in a continuous-wave regime; they begin to oscillate as the coupling strength reaches a certain threshold value. When the coupling further increases, the dynamics exhibit a route to chaos via a sequence of Hopf bifurcations resulting in periodic, quasiperiodic, and chaotic oscillations. In the chaotic range, different synchronization states, ranging from asynchronous behavior to phase and near synchronization, are observed. The analytical solution yields a large number of fixed points.

Dynamics of an array of mutually coupled semiconductor lasers

Physical Review E, 2006

We consider the dynamics of a linear array of coupled semiconductor lasers. Particular attention is paid to the synchronous states, which are caused by the permutation of two outer lasers. A system of three coupled lasers is studied in more details. We report different types of multistability of synchronous and asynchronous states including chaotic ones. We identify parameter values, for which a synchronous chaos can occur. Moreover, we show that transition to the synchronization occurs via blowup of the synchronous transversely unstable invariant set within the synchronization manifold. Finally, we present numerical analysis of larger arrays of coupled lasers and note some common qualitative features of the synchronization regions, which are independent of the number of lasers.

Numerical analysis of chaos synchronization in semiconductor lasers subject to a common drive signal

Electronics and Communications in Japan, 2010

Chaos synchronization of two semiconductor lasers commonly driven by a chaotic semiconductor laser subject to optical feedback was observed. Strongly correlated chaos synchronization between the two response lasers was observed even when the correlation between the drive and response lasers was low. It is shown that the cross correlation between the two responses is larger than that between the drive and response lasers over a wide parameter region.

Synchronization of chaotic semiconductor laser systems: a vectorial coupling-dependent scenario

Physical review letters, 2002

We demonstrate the influence of vectorial coupling on the synchronization behavior of complex systems. We study two semiconductor lasers subject to delayed optical feedback which are unidirectionally coherently coupled via their optical fields. Our experimental and numerical results demonstrate a characteristic synchronization scenario in dependence on the relative feedback phase leading cyclically from chaos synchronization to almost uncorrelated states, and back to chaos synchronization. Finally, we reveal the influence of the feedback phase on the dynamics of the solitary delay system.

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.

Chapter 2. Synchronization of chaotic semiconductor lasers

Recent Achievements in Laser Dynamics: Control and Synchronization, 2008

This chapter provides an overview of experimental work on the synchronization of chaotic semiconductor lasers for applications in secure optical communications.

Chaos-Synchronization In Semiconductor Laser Systems: An Optical Phase-Dependent Scenario

Experimental Chaos, 2002

Synchronization of chaotic oscillators is of high current interest in various areas of science. Semiconductor laser systems offer a great potential for experimental studies of synchronization phenomena, because of well-controllable parameters, wellstudied nonlinear dynamical behavior and their broad spectrum of applications. We investigate chaos-synchronization of two unidirectionally coupled semiconductor lasers with delayed optical feedback. We present a characteristic synchronization scenario in dependence of the relative optical cavity phase of the subsystems. For adjusted phase, we find excellent synchronization of the intensity dynamics in combination with coherence among the emitted fields of the lasers, despite of the fast chaotic wavelengthfluctuations. Variation of the phase leads to conspicuous changes in the intensitydynamics associated with drastically reduced correlation and loss of coherence among the lasers. Our results provide insight into the consequences of vectorial coupling for the synchronization scenario and open the perspective for innovative concepts for encrypted GHz data communication.

Spatiotemporal chaos in broad-area semiconductor laser

Journal of the Optical Society of America B, 1993

We study the space-time dynamical behavior of broad-area semiconductor lasers, using an extended phenomenological laser model to include transverse diffraction of the counterpropagating optical fields and transverse diffusion of carriers. Numerical results show that the profile of the output intensity exhibits spatiotemporal chaos by way of changing random filaments. A small confinement factor and/or linewidth enhancement factor can prevent instabilities. Simulations also confirm experimental results showing that a half-symmetric unstable resonator with a suitable mirror curvature restores stability.