scholarly journals Effect of short time delays of quantum dot semiconductor lasers with optoelectronic feedback

2020 ◽  
Author(s):  
Basim Abdullattif Ghalib ◽  
Rajaa Hussein Abd Ali
Keyword(s):  
Quantum Dot ◽  
Semiconductor Lasers ◽  
Time Delays ◽  
Short Time

InAs/InP based quantum dot mode-locked semiconductor lasers at 1.5 μm

2007 ◽  
Author(s):  
Guang-Hua Duan ◽  
F. Lelarge ◽  
B. Dagens ◽  
R. Brenot ◽  
A. Accard ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Semiconductor Lasers

Cardiorespiratory interactions in patients with atrial flutter

2009 ◽  
Vol 106 (1) ◽  
pp. 29-39 ◽  
Author(s):  
Michela Masè ◽  
Marcello Disertori ◽  
Flavia Ravelli
Keyword(s):  
Atrial Flutter ◽  
Time Delays ◽  
Supraventricular Arrhythmia ◽  
Sinus Arrhythmia ◽  
Respiratory Arrhythmia ◽  
Strongly Coupled ◽  
Av Conduction ◽  
Frequency Independent ◽  
Modulation Pattern ◽  
Short Time

Respiratory sinus arrhythmia (RSA) is generally known as the autonomically mediated modulation of the sinus node pacemaker frequency in synchrony with respiration. Cardiorespiratory interactions have been largely investigated during sinus rhythm, whereas little is known about interactions during reentrant arrhythmias. In this study, cardiorespiratory interactions at the atrial and ventricular level were investigated during atrial flutter (AFL), a supraventricular arrhythmia based on a reentry, by using cross-spectral analysis and computer modeling. The coherence and phase between respiration and atrial (γ[Formula: see text], φAA) and ventricular (γ[Formula: see text], φRR) interval series were estimated in 20 patients with typical AFL (68.0 ± 8.8 yr) and some degree of atrioventricular (AV) conduction block. In all patients, atrial intervals displayed oscillations strongly coupled and in phase with respiration (γ[Formula: see text]= 0.97 ± 0.05, φAA = 0.71 ± 0.31 rad), corresponding to a paradoxical lengthening of intervals during inspiration. The modulation pattern was frequency independent, with in-phase oscillations and short time delays (0.40 ± 0.15 s) for respiratory frequencies in the range 0.1–0.4 Hz. Ventricular patterns were affected by AV conduction type. In patients with fixed AV conduction, ventricular intervals displayed oscillations strongly coupled (γ[Formula: see text]= 0.97 ± 0.03) and in phase with respiration (φRR = 1.08 ± 0.80 rad). Differently, in patients with variable AV conduction, respiratory oscillations were secondary to Wencheback rhythmicity, resulting in a decreased level of coupling (γ[Formula: see text]= 0.50 ± 0.21). Simulations with a simplified model of AV conduction showed ventricular patterns to originate from the combination of a respiratory modulated atrial input with the functional properties of the AV node. The paradoxical frequency-independent modulation pattern of atrial interval, the short time delays, and the complexity of ventricular rhythm characterize respiratory arrhythmia during AFL and distinguish it from normal RSA. These peculiar features can be explained by assuming a direct mechanical action of respiration on AFL reentrant circuit.

Quantum dot semiconductor lasers for 5G and beyond wireless networks

2021 ◽  
Author(s):  
Zhenguo Lu ◽  
Khan Zeb ◽  
Jiaren Liu ◽  
Eric Liu ◽  
Linda Mao ◽  
...  
Keyword(s):  
Wireless Networks ◽  
Quantum Dot ◽  
Semiconductor Lasers

Intensity noise and modulation dynamic of epitaxial quantum dot semiconductor lasers on silicon

2021 ◽  
Author(s):  
Frédéric Grillot ◽  
Jianan Duan ◽  
Shiyuan Zhao ◽  
Bozhang Dong ◽  
Heming Huang ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Semiconductor Lasers ◽  
Intensity Noise

scholarly journals Crisis roots of quantum dot semiconductor lasers with positive and negative optoelectronics feedback

2019 ◽  
Author(s):  
Rajaa Hussein Abd Ali ◽  
Basim Abdullattif Ghalib ◽  
Rabab Saadoon Abdoon
Keyword(s):  
Quantum Dot ◽  
Semiconductor Lasers
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