Optically injected quantum dot lasers: impact of nonlinear carrier lifetimes on frequency-locking dynamics

Pausch, Johannes; Otto, Christian; Tylaite, Egle; Majer, Niels; Schöll, Eckehard; Lüdge, Kathy

doi:10.1088/1367-2630/14/5/053018

Cited by 60 publications

(62 citation statements)

References 35 publications

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“…Phase approximation in this case results in a delayed Adler equation, and it would be both theoretically and practically important to consider possible solutions of this model for different delay distributions. Other more complex locking scenarios have been found in quantum-dot lasers under optical injection [87,88].…”

Section: Discussionmentioning

confidence: 91%

Amplitude and phase dynamics in oscillators with distributed-delay coupling

Kyrychko

Blyuss

Schöll

2013

Phil. Trans. R. Soc. A.

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This paper studies the effects of distributed-delay coupling on the dynamics in a system of non-identical coupled Stuart–Landau oscillators. For uniform and gamma delay distribution kernels, the conditions for amplitude death are obtained in terms of average frequency, frequency detuning and the parameters of the coupling, including coupling strength and phase, as well as the mean time delay and the width of the delay distribution. To gain further insights into the dynamics inside amplitude death regions, the eigenvalues of the corresponding characteristic equations are computed numerically. Oscillatory dynamics of the system is also investigated, using amplitude and phase representation. Various branches of phase-locked solutions are identified, and their stability is analysed for different types of delay distributions.

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Section: Discussionmentioning

confidence: 91%

Amplitude and phase dynamics in oscillators with distributed-delay coupling

Kyrychko

Blyuss

Schöll

2013

Phil. Trans. R. Soc. A.

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“…The internal structure, however, remains the same, with two pronounced chaotic regions located inside the ellipse, suggesting a high robustness of the global bifurcation structure towards changes in the pump current [PAU12].…”

Section: Dependence On the Quantum-dot Structure And Pump-currentmentioning

confidence: 94%

“…The reduction of α E is due to the reduced modulation of the off-resonant states when we modulate the resonant charge-carriers directly via the electric field. Since a low value of the amplitude-phase coupling leads to a reduction of the dynamical complexity under optical perturbations [GLO12,PAU12], we can thus expect a slow scattering rate to increase the resistance to unwanted instabilities in quantum-dot lasers.…”

Section: Influence Of Scattering Rates and Reservoir Lossesmentioning

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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“…QDWELL LASER The LS rate equation system for the optically injected QDWELL laser with two-level QDs has the form [3].…”

Section: Theoretical Model Of An Optically Injectedmentioning

confidence: 99%

“…In order to improve the performance of directly modulated semiconductor lasers, the optical injection locking (OIL) of semiconductor lasers can be used providing a single-mode regime with side-mode suppression, strongly enhanced RO frequency, enhanced bandwidth, reduced nonlinearity, reduced relative intensity noise (RIN), reduced chirp, increased link gain, and near-single-sideband modulation [2]. The complicated dynamics of optically injected QDWELL lasers has been investigated both theoretically and experimentally using the Lüdge-Schöll (LS) model [3], [4]. We have shown that due to the optical injection, the electron and hole dynamics in QW and QDs is synchronized, and consequently, the QDWELL laser demonstrates a high performance in the large signal regime for the moderate bias current level at the repetition frequencies up to 25GHz.…”

mentioning

confidence: 99%

Quantum dot-in-a-well (QDWELL) laser dynamics under optical injection

Ezra

Lembrikov

2013

Opt Quant Electron

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Abstract-We investigated theoretically the optical injection influence on the dynamics of a quantum dot (QD) in a quantum well (QDWELL) laser. The carrier dynamics is synchronized due to the optical injection, and QDWELL laser manifests a high performance at repetition frequencies up to 25GHz. I. INTRODUCTIONA novel type of quantum dot (QD) laser with the-dotin-a-well (DWELL) structure based on InAs QDs grown in the strained InGaAs quantum well (QW) characterized by an extremely low threshold current density of 42.6A · cm −2 and a lasing wavelength near 1.3µm has been recently proposed [1]. However, the QDWELL laser modulation bandwidth of 7GHz is limited by the relaxation oscillation (RO) frequency. In order to improve the performance of directly modulated semiconductor lasers, the optical injection locking (OIL) of semiconductor lasers can be used providing a single-mode regime with side-mode suppression, strongly enhanced RO frequency, enhanced bandwidth, reduced nonlinearity, reduced relative intensity noise (RIN), reduced chirp, increased link gain, and near-single-sideband modulation [2]. The complicated dynamics of optically injected QDWELL lasers has been investigated both theoretically and experimentally using the Lüdge-Schöll (LS) model [3], [4]. We have shown that due to the optical injection, the electron and hole dynamics in QW and QDs is synchronized, and consequently, the QDWELL laser demonstrates a high performance in the large signal regime for the moderate bias current level at the repetition frequencies up to 25GHz.

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Optically injected quantum dot lasers: impact of nonlinear carrier lifetimes on frequency-locking dynamics

Cited by 60 publications

References 35 publications

Amplitude and phase dynamics in oscillators with distributed-delay coupling

Amplitude and phase dynamics in oscillators with distributed-delay coupling

Nonlinear and Nonequilibrium Dynamics of Quantum-Dot Optoelectronic Devices

Quantum dot-in-a-well (QDWELL) laser dynamics under optical injection

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