Chaos-based communications using semiconductor lasers subject to feedback from an integrated double cavity

Tronciu, Vasile; Mirasso, Claudio R.; Colet, Pere

doi:10.1088/0953-4075/41/15/155401

Cited by 16 publications

(11 citation statements)

References 30 publications

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“…For example, chaotic semiconductor lasers have been successfully used for random-number generation [REI09a,OLI11,HAR12,NGU12a], as well as for secure communication [TRO08,LUE11b,UCH12]. Furthermore, their complex dynamics allow for the studying of many generic nonlinear phenomena in a comparably simple experimental setup [LAR10].…”

Section: Amplitude-phase Coupling In Quantum-dot Lasersmentioning

confidence: 99%

Nonlinear and Nonequilibrium Dynamics of Quantum-Dot Optoelectronic Devices

Lingnau

2015

Springer Theses

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In this thesis the dynamics and performance of optoelectronic devices based on semiconductor quantum-dots are investigated.In the first part, the dynamics of quantum-dot lasers under external perturbations is discussed. Using a microscopically based balance equation model that incorporates detailed charge-carrier scattering dynamics and the possibility to describe nonequilibrium between intra-band electronic states, the relaxation oscillations of the quantum-dot laser are investigated. Three qualitatively different dynamic regimes are identified in dependence of the scattering rates -the "constantreservoir" regime for slow scattering, the "overdamped" regime, and the "synchronized" regime for high scattering -characterized by a varying degree of nonequilibrium between the quantum-dot and reservoir states.Important differences to conventional lasers are found in the modulation response and the dynamics in optical injection and feedback setups. Common theoretical models and approaches used to describe these applications are shown to yield inaccurate predictions, especially in the "constant-reservoir" and "overdamped" dynamic regimes. An important consequence is that the amplitude-phase coupling in quantum-dot lasers, commonly described by the α-factor, differs from conventional descriptions due to the desynchronization of gain and refractive index. While the α-factor describes bifurcations of fixed points accurately, it fails in describing dynamic solutions and overestimates the extent of complex dynamics. The observed low sensitivity to optical perturbations in quantum-dot lasers can therefore be attributed partly to the charge-carrier nonequilibrium. Three quantum-dot laser models on different levels of sophistication are presented that can accurately describe the quantum-dot nonequilibrium dynamics.In the second part of the thesis, the performance of quantum-dot semiconductor optical amplifiers is investigated, and two types of applications unique to quantum-dots as active medium are discussed. The ground and excited states of the quantum-dots allow an ultra-broad-band amplification of optical data streams. Amplified signals on the ground-state frequencies are shown to generally exhibit higher quality than on the excited state, due to a lower sensitivity of the groundstate to carrier-density variations. Nevertheless the quantum-dot amplifier is found to allow effective amplification on both frequency ranges. Furthermore, a parameter range is identified that allows for a simultaneous amplification of data signals on the ground and excited state in a counter-propagating setup.The long microscopically polarization dephasing times in quantum-dots are found to enable quantum-coherent interactions on a macroscopic scale at room-temperature. By comparison with experiments, the occurrence of Rabi-oscillations by amplification of ultra-short pulses is demonstrated. Quantum-dot based devices could therefore be used for future applications based on quantum-coherent effects.

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Section: Amplitude-phase Coupling In Quantum-dot Lasersmentioning

confidence: 99%

Nonlinear and Nonequilibrium Dynamics of Quantum-Dot Optoelectronic Devices

Lingnau

2015

Springer Theses

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“…The external phase sections can be driven independently . We show that multiple feedbacks lead to a more complex behaviour which, in fact, is already indicated when looking at the number and location of the fixed points [3]. In the present study, the laser dynamics is analyzed in the framework of the extended Lang-Kobayashi equations for the complex field amplitude and excess carrier density [4].…”

mentioning

confidence: 61%

Chaos generation, synchronization and communications using an integrated source with an air gap

Tronciu

Mirasso

Colet

et al. 2009

CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference

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Recent technological progress brings into reach stable compact multisections semiconductor lasers. Such devices may be very suitable for chaotic secure communication [1,2]. We report results of numerical and experimental investigations of the dynamical behaviour of continuous-wave semiconductor lasers under the influence of a multiple feedbacks (see Figurel left panel). The system consists of DFB laser coupled to two external phase sections and an airgap section. The external phase sections can be driven independently . We show that multiple feedbacks lead to a more complex behaviour which, in fact, is already indicated when looking at the number and location of the fixed points [3]. In the present study, the laser dynamics is analyzed in the framework of the extended Lang-Kobayashi equations for the complex field amplitude and excess carrier density [4]. The optimal conditions for chaos generation are identified and a comparison of the dynamics of this configuration with that of conventional optical feedback is presented. A good agreement is obtained between measurements and theoretical simulations.We have found that two of these devices can be synchronized when operating in the chaotic regime in a master-slave configuration. We report also on the influence of parameters mismatch on the synchronization quality and show how the features of the external cavities have an influence on the laser behaviour . We also found both in theory and experiment that for small enough mismatches , good quality synchronization is achieved. For the parameter values where good synchronization is achieved, it is possible to encode a message in the carrier using the chaos modulation technique. Right panel of Fig. 1 depicts the process of a 10 Gbit/s message encryption that can be appropriately recovered at the receiver (see the bottom panel).

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“…We note that if r τ = τ 1 /τ 2 ∈ Q, the modes lie on a closed curve, and irrational ratios r τ result in a more complicated mode spectrum. Tronciu et al [12], who investigated the corresponding case of lasers subject to feedback from an integrated double cavity, found chaotic behavior for lower feedback strengths than needed for the case of single feedback. The more complex mode alignment was postulated as a cause for a more complex dynamics.…”

Section: B Dynamical Regimesmentioning

confidence: 99%

“…For technological applications, a particularly interesting effect is chaos synchronization [6][7][8], since it may provide new secure communication schemes [9]. In this context, semiconductor lasers have been proposed [10][11][12][13] as a physical realization of chaos-based cryptography systems, because this would allow the use of existing communication infrastructures [14].…”

Section: Introductionmentioning

confidence: 99%

Mismatch and synchronization: Influence of asymmetries in systems of two delay-coupled lasers

et al. 2011

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We study the synchronization properties of the delay dynamics of two identical semiconductor lasers coupled through a semitransparent mirror. Via an analytical and numerical approach, we investigate the influence of asymmetries, in particular mismatches of self- and cross-coupling strength and differences in self- and cross-coupling delay. We show that the former mismatch affects the stability of the zero-lag state but not the dynamics within the synchronization manifold, while the latter mismatch does not affect the quality of synchronization but alters the dynamics significantly. Our results are extended to different unidirectional coupling schemes. This is highly relevant for communication schemes utilizing chaotic dynamics. Finally, the influence of nonlinear gain saturation on the dynamics and stability of synchronization is discussed.

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Chaos-based communications using semiconductor lasers subject to feedback from an integrated double cavity

Cited by 16 publications

References 30 publications

Nonlinear and Nonequilibrium Dynamics of Quantum-Dot Optoelectronic Devices

Nonlinear and Nonequilibrium Dynamics of Quantum-Dot Optoelectronic Devices

Chaos generation, synchronization and communications using an integrated source with an air gap

Mismatch and synchronization: Influence of asymmetries in systems of two delay-coupled lasers

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