Integrated quantum-dot laser devices: modulation stability with electro-optic modulator

Wegert, Miriam; Schwochert, Daniel; Schöll, Eckehard; Lüdge, Kathy

doi:10.1007/s11082-014-9878-2

Cited by 6 publications

(5 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Following 68 , this is implemented by an effective ES lifetime , which exponentially depends on the absorber bias U . Secondly, the optical transitions are slightly red shifted due to the quantum confined stark effect 66,69 , which is implemented via the detuning Δ ω GS in the polarization equation. We assume that the red shift scales linearly with the applied reverse bias.…”

Section: Methodsmentioning

confidence: 99%

“…We assume that the red shift scales linearly with the applied reverse bias. The constituting equations are then given bywhere the parameters are chosen similarly to 66,68,69 and are given in Table 1. Additionally, we set the differential gain coefficient in the absorber section to , since the decreased carrier density in the surrounding quantum well leads to reduced coulomb scattering and thereby to an increased microscopic dephasing time of the optical transitions 70 .…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Ultra-Short Pulse Generation in a Three Section Tapered Passively Mode-Locked Quantum-Dot Semiconductor Laser

Meinecke

Drzewietzki

Weber

et al. 2019

Sci Rep

View full text Add to dashboard Cite

We experimentally and theoretically investigate the pulsed emission dynamics of a three section tapered semiconductor quantum dot laser. The laser output is characterized in terms of peak power, pulse width, timing jitter and amplitude stability and a range of outstanding pulse performance is found. A cascade of dynamic operating regimes is identified and comprehensively investigated. We propose a microscopically motivated traveling-wave model, which optimizes the computation time and naturally allows insights into the internal carrier dynamics. The model excellently reproduces the measured results and is further used to study the pulse-generation mechanism as well as the influence of the geometric design on the pulsed emission. We identify a pulse shortening mechanism responsible for the device performance, that is unique to the device geometry and configuration. The results may serve as future guidelines for the design of monolithic high-power passively mode-locked quantum dot semiconductor lasers.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Ultra-Short Pulse Generation in a Three Section Tapered Passively Mode-Locked Quantum-Dot Semiconductor Laser

Meinecke

Drzewietzki

Weber

et al. 2019

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The roundtrip time τ = 2L/c scales with the length between the system and the mirror. The feedback strength is determined by the coupling constant g. transient feeback regime [17,20] between classical [21][22][23][24] and quantum feedback is under investigation [16,25].…”

Section: Introductionmentioning

confidence: 99%

“…These time-correlated quantities provide insight and allow the application of factorization techniques, as the degree of entanglement is directly accessible. Factorization such as cluster expansion [19] and Born approximation are unavoidable if the transient feeback regime [17,20] between classical [21][22][23][24] and quantum feedback is under investigation [16,25].…”

Section: Introductionmentioning

confidence: 99%

Unraveling coherent quantum feedback for Pyragas control

et al. 2016

View full text Add to dashboard Cite

We present a Heisenberg operator based formulation of coherent quantum feedback and Pyragas control. This model is easy to implement and allows for an efficient and fast calculation of the dynamics of feedback-driven observables as the number of contributing correlations grows in systems with a fixed number of excitations only linearly in time. Furthermore, our model unravels the quantum kinetics of entanglement growth in the system by explicitly calculating non-Markovian multi-time correlations, e.g., how the emission of a photon is correlated with an absorption process in the past. Therefore, the time-delayed differential equations are expressed in terms of insightful physical quantities. Another considerate advantage of this method is its compatibility to typical approximation schemes, such as factorization techniques and the semi-classical treatment of coherent fields. This allows the application on a variety of setups, ranging from closed quantum systems in the few excitation regimes to open systems and Pyragas control in general.

show abstract

“…The main advantage of QD-SOAs, as compared to the bulk and quantum-well SOAs, is gained from the existence of the gap between the QD levels and the wetting layer and on the lower cross section of the carrier photon interaction, which results in shorter carrier relaxation times and lower gain saturation. The all-optical QD-SOA-based switches and different operations have been studied by different research groups [16][17][18][19][20][21][22]. In our previous paper [15], we have used four TOAD-based optical switches, but in this paper, we have proposed and describe a simultaneous all-optical half adder/subtractor circuit using only two QDSOA-MZI-based all-optical switches.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous all-optical basic arithmetic operations using QD-SOA-assisted Mach–Zehnder interferometer

Gayen¹,

Chattopadhyay²

2016

J Comput Electron

View full text Add to dashboard Cite

All-optical logic and arithmetic operations are expected to play an important role in high-speed communication systems. In this paper, we have presented a model to perform two basic arithmetic operations (addition/subtraction) on two binary digits based on a quantum dot semiconductor optical amplifier (QD-SOA)-assisted MachZehnder interferometer. Using two QD-SOA-based switches, we have designed a half adder/subtractor circuit. The main advantage of this circuit is that simultaneous addition and subtraction operations are realized at the outputs. This circuit is designed theoretically and verified through numerical simulations. The theoretical study is carried out by taking into account the effect of amplified spontaneous emission. The dependence of the peak data power and that of the QD-SOA current density and length on the ER and Q factor of the switching outcome are explored and assessed by means of numerical simulations. The desirable device parameters has been examined in order to obtain the optimum best performance.Keywords Quantum dot semiconductor optical amplifier · Mach-Zehnder interferometer · All-optical signal processing · All-optical arithmetic operation B Tanay Chattopadhyay

show abstract

Integrated quantum-dot laser devices: modulation stability with electro-optic modulator

Cited by 6 publications

References 21 publications

Ultra-Short Pulse Generation in a Three Section Tapered Passively Mode-Locked Quantum-Dot Semiconductor Laser

Ultra-Short Pulse Generation in a Three Section Tapered Passively Mode-Locked Quantum-Dot Semiconductor Laser

Unraveling coherent quantum feedback for Pyragas control

Simultaneous all-optical basic arithmetic operations using QD-SOA-assisted Mach–Zehnder interferometer

Contact Info

Product

Resources

About