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We investigate the impact of amplitude-phase coupling on the dynamics of a passively mode-locked laser subject to optical feedback. This is done using a delay differential equation model to calculate bifurcation diagrams in the plane of the feedback parameters. We find an increased complexity in the dynamics of the laser when the effective α-factors of the gain and absorber sections are different...
Using an optimized delay-differential-equation model, we efficiently simulate the signal propagation through a quantum-dot semiconductor amplifier. We analyze the device performance by means of the signal quality factor when amplifying signals on either the ground or excited state transition, in dependence of pump current and signal power.
Optical feedback can be used to reduce the timing jitter of passively mode-locked lasers. Using a delay differential equation model, we investigate the effect of optical feedback on a passively mode-locked laser. We find that longer feedback delay times lead to more effective jitter reduction. However, with non-zero amplitude-phase coupling in the laser sections, long delay feedback can give rise...
Excited-state lasing in quantum dot lasers is theoretically demonstrated to exhibit a broader modulation response, lower chirp-to-power ratio, and smaller linewidth enhancement factor in comparison with the conventional lasing in the ground state.
Simulations using a microscopic, nonequilibrium, semiconductor laser model show that the long-established α-factor concept breaks down in quantum-dot lasers, especially under complex dynamic scenarios, such found during high-excitation or optical-injection operations.
We investigate the nonlinear dynamics of a quantum-dot laser coupled to an electro-optic modulator using the Lang-Kobayashi model. We determine the effect of the detuning between the EOM and the QD laser and the influence of the static phase shift on the QD laser dynamics. The electro-optical modulator's model is based on semiconductor Maxwell-Bloch equations with voltage dependent loss rates.
The observation of coherent light-matter interaction in an ensemble of oscillators requires that a macroscopic number of individual oscillators retain a fixed phase relationship for a significant amount of time. In the condensed phase, given the high density and consequently a very fast dephasing time T2, observable effects are usually limited to low temperatures. We study experimentally and numerically...
We show the occurrence of Rabi oscillation induced pulse shaping and break-up in a 1.3μm wavelength semiconductor quantum-dot optical amplifiers at room temperature in numerical simulations and experimental results.
We use a semiconductor optical Bloch equation approach combined with a traveling wave equation for the electric field to explore the effect of noise on the signal quality of a quantum-dot(QD) semiconductor optical amplifier. Using a stochastic white noise source for the spontaneous emission inside the QDs, we can show that there is a tradeoff between amplification performance and signal quality. Nevertheless,...
We model two-state lasing from the ground state and the excited state in quantum dot lasers with microscopically based rate equations. We find that carrier heating tends to suppress ground state lasing and to lower the threshold of excited state lasing. Furthermore the damping of the excited state turn-on dynamics is increased. Also band-structure effects upon two-state lasing are investigated. All...
We investigate the wavelength conversion efficiency of quantum dot semiconductor optical amplifiers using nonde-generate four-wave mixing. Further we calculate the linewidth enhancement factor as a function of the injection current and determine the effect of the carrier reservoir. The model is on the basis of semiconductor Maxwell-Bloch equations with microscopically calculated interband Coulomb...
Quantum dot semiconductor optical amplifiers (QD-SOAs) are investigated in terms of their gain recovery performance and wavelength conversion efficiency using four wave mixing (FWM). Fast carrier-carrier scattering and a low amplitude phase coupling (alpha factor) in semiconductor QD devices make them promising candidates for ultrafast gain recovery dynamics [1] and efficient wavelength conversion...
We show by analytical and numerical results that coupling an external Fabry-Perot resonator to a semiconductor laser can efficiently suppress noise-induced intensity pulsations (relaxation oscillations). This constitutes a realization of time-delayed feedback control.
The dynamic response of semiconductor quantum dot lasers can be quantitatively understood by including the strong nonlinearity of electron-electron scattering processes.We combine microscopically calculated Coulomb scattering rates with a rate equation model.
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