Excitable phase slips in an injection-locked single-mode quantum-dot laser

Kelleher, Bryan; Goulding, David; Hegarty, Stephen P.; Huyet, Guillaume; Cong, D.-Y.; Martinez, A.; Lemaı̂tre, A.; Ramdane, A.; Fischer, M.; Gerschutz, F.; Koeth, Johannes

doi:10.1364/ol.34.000440

Cited by 67 publications

(50 citation statements)

References 20 publications

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“…Both the experimental and analytical stability diagrams predict stable locking for a larger domain of detuning compared to a QW laser. Moreover, there are no Hopf bifurcations at low injection strengths as previously demonstrated experimentally in [14]. At higher injection strengths and for a sufficiently large positive detuning, steady-state locking occurs through a Hopf bifurcation ðH 2 in Fig.…”

Section: Linear Stabilitysupporting

confidence: 71%

“…For the positively detuned side the intensity increases, then drops below the steady-state value, and eventually again recovers to the steady-state value. These are excitable pulses resulting from 2p phase rotations of the slave electric field as shown in [14]. In [23] complicated multipulse excitability in optically injected QW lasers was predicted and has since been observed in [16].…”

Section: Methodsmentioning

confidence: 95%

“…A particularly attractive property is an unusually high damping of the ROs [18] in comparison to their bulk and quantum well (QW) counterparts. This high damping has been cited as the principal reason for the increased stability of such devices subject to optical feedback [21], optical injection [8,10,14], and mutual coupling [12,15] configurations. We determine here an experimental stability diagram with the injection strength and the detuning as control parameters and note that it is considerably different from that of a conventional QW laser.…”

Section: Introductionmentioning

confidence: 99%

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Optically Injected Single-Mode Quantum Dot Lasers

Kelleher

Goulding

Hegarty

et al. 2012

Quantum Dot Devices

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The response of an optically injected quantum dot semiconductor laser is studied both experimentally and theoretically. Specifically, the locking boundaries are investigated, revealing features more commonly associated with Class A lasers rather than conventional Class B semiconductor lasers (SLs). Further, various dynamical regimes are observed including excitability and multistability. Of particular interest is the observation of a phase-locked bistability. We determine the stability diagram analytically using appropriate rate equations for quantum dot lasers. In particular, the saddle-node (SN) and Hopf bifurcations forming the locking boundaries are examined and are shown to reproduce the observed experimental stability features. The generation of the phase-locked bistability is also explained via a combination of these bifurcations.

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Section: Linear Stabilitysupporting

confidence: 71%

Section: Methodsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Optically Injected Single-Mode Quantum Dot Lasers

Kelleher

Goulding

Hegarty

et al. 2012

Quantum Dot Devices

Self Cite

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“…We will show later on by using numeric path-continuation techniques that here indeed a saddle-node bifurcation is responsible for the loss of phase-locking. Close to this SNIPER bifurcation, the injected laser has been shown to be excitable [GOU07,KEL09,KEL11]. This can be understood by the close distance of the stable node and the saddle in phase-space.…”

Section: Injection Locking Of Quantum-dot Lasersmentioning

confidence: 94%

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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“…This pulse consists of the relative phase between slave and master laser completing a full circle before settling again to the initial value 24,29 , in excellent analogy with an overdamped pendulum submitted to a fluid torque 30 or excitable particles in an optical torque wrench 31 . Slow (4200 ps) or wrongly oriented phase variations do not trigger the excitable response 24 .…”

Section: Experimentmentioning

confidence: 99%

Topological solitons as addressable phase bits in a driven laser

et al. 2015

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Optical localized states are usually defined as self-localized bistable packets of light, which exist as independently controllable optical intensity pulses either in the longitudinal or transverse dimension of nonlinear optical systems. Here we demonstrate experimentally and analytically the existence of longitudinal localized states that exist fundamentally in the phase of laser light. These robust and versatile phase bits can be individually nucleated and canceled in an injection-locked semiconductor laser operated in a neuron-like excitable regime and submitted to delayed feedback. The demonstration of their control opens the way to their use as phase information units in next-generation coherent communication systems. We analyse our observations in terms of a generic model, which confirms the topological nature of the phase bits and discloses their formal but profound analogy with Sine-Gordon solitons.

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Excitable phase slips in an injection-locked single-mode quantum-dot laser

Cited by 67 publications

References 20 publications

Optically Injected Single-Mode Quantum Dot Lasers

Optically Injected Single-Mode Quantum Dot Lasers

Nonlinear and Nonequilibrium Dynamics of Quantum-Dot Optoelectronic Devices

Topological solitons as addressable phase bits in a driven laser

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