scholarly journals Supercontinuum generation in dispersion engineered AlGaAs-on-insulator waveguides

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Stuart May ◽  
Matteo Clerici ◽  
Marc Sorel
Keyword(s):  
Nonlinear Dynamics ◽  
Numerical Simulations ◽  
Supercontinuum Generation ◽  
Pronounced Effect ◽  
Dispersive Wave ◽  
Fundamental Physics ◽  
Wave Dynamics ◽  
Waveguide Width ◽  
Nonlinear Devices ◽  
Pulse Energies

AbstractThe effect of engineering the dispersion of AlGaAs-on-insulator (AlGaAs-OI) waveguides on supercontinuum generation is investigated at telecom wavelengths. The pronounced effect the waveguide width has on the nonlinear dynamics governing the supercontinua is systematically analyzed and the coherence of the spectra verified with numerical simulations. Using dispersion engineered AlGaAs-OI waveguides, broadband supercontinua were readily obtained for pulse energies of $$\sim \text {3 pJ}$$ ∼ 3 pJ and a device length of only 3 mm. The results presented here, further understanding of the design and fabrication of this novel platform and describe the soliton and dispersive wave dynamics responsible for supercontinuum generation. This study showcases the potential of AlGaAs-OI for exploring fundamental physics and realizing highly efficient, compact, nonlinear devices.

Broadband Supercontinuum Generation in a Tapered-Rib Lead-Silicate Waveguide

2015 ◽  
Vol 24 (03n04) ◽  
pp. 1550009 ◽  
Author(s):  
Hongyu Hu ◽  
Wenbo Li ◽  
Xiang Zhang ◽  
Niloy K. Dutta
Keyword(s):  
Numerical Simulations ◽  
Matching Condition ◽  
Supercontinuum Generation ◽  
Phase Matching ◽  
Etch Depth ◽  
Lead Silicate ◽  
Dispersive Wave ◽  
Output Spectrum ◽  
Wave Emission ◽  
Phase Matching Condition

We have studied supercontinuum generation in a tapered-rib lead-silicate waveguide. The Air-SF57 glass-SiO2 waveguide is 2 cm long, with a varying etch depth to manage the dispersion profile. Numerical simulations are conducted for input sech2 pulses centered at 1.55 μm. Due to continuous modification of the phase matching condition for dispersive wave emission, the proposed waveguide geometry generates broadband output spectrum extending from ~1 μm to ~4.6 μm at −30 dB level. With proper pumping conditions, fully coherent supercontinuum can be obtained.

Dynamics of a Supported Cylinder in Axial Flow

2011 ◽  
Vol 99-100 ◽  
pp. 1059-1062
Author(s):  
Ji Duo Jin ◽  
Ning Li ◽  
Zhao Hong Qin
Keyword(s):  
Nonlinear Dynamics ◽  
Numerical Analysis ◽  
Numerical Simulations ◽  
Nonlinear Model ◽  
Dynamical Behavior ◽  
Axial Flow ◽  
Viscous Force ◽  
Friction Drag ◽  
Flutter Instability ◽  
Nonlinear Force

The nonlinear dynamics are studied for a supported cylinder subjected to axial flow. A nonlinear model is presented for dynamics of the cylinder supported at both ends. The nonlinear terms considered here are the quadratic viscous force and the structural nonlinear force induced by the lateral motions of the cylinder. Using two-mode discretized equation, numerical simulations are carried out for the dynamical behavior of the cylinder to explain the flutter instability found in the experiment. The results of numerical analysis show that at certain value of flow velocity the system loses stability by divergence, and the new equilibrium (the buckled configuration) becomes unstable at higher flow leading to post-divergence flutter. The effect of the friction drag coefficients on the behavior of the system is investigated.

scholarly journals Pinning-Like Adaptive Consensus for Networked Mobile Agents with Heterogeneous Nonlinear Dynamics

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Chengjie Xu ◽  
Yanwei Wang ◽  
Hong Zhang ◽  
Xiaoqi Zhou
Keyword(s):  
Nonlinear Dynamics ◽  
Adaptive Control ◽  
Numerical Simulations ◽  
Lyapunov Stability ◽  
Mobile Agents ◽  
Pinning Control ◽  
Adaptive Strategy ◽  
Global Information ◽  
First Order ◽  
Coupling Strengths

This paper investigates the adaptive consensus for networked mobile agents with heterogeneous nonlinear dynamics. Using tools from matrix, graph, and Lyapunov stability theories, sufficient consensus conditions are obtained under adaptive control protocols for both first-order and second-order cases. We design an adaptive strategy on the coupling strengths, which can guarantee that the consensus conditions do not require any global information except a connection assumption. The obtained results are also extended to networked mobile agents with identical nonlinear dynamics via adaptive pinning control. Finally, numerical simulations are presented to illustrate the theoretical findings.

Nonlinear dynamics of the elliptic instability

2010 ◽  
Vol 646 ◽  
pp. 471-480 ◽  
Author(s):  
NATHANAËL SCHAEFFER ◽  
STÉPHANE LE DIZÈS
Keyword(s):  
Nonlinear Dynamics ◽  
Numerical Simulations ◽  
Shear Layer ◽  
Rapid Growth ◽  
Vortex Core ◽  
Nonlinear Evolution ◽  
Core Size ◽  
Layer Formation ◽  
Vortex Loop ◽  
Weakly Nonlinear

In this paper, we analyse by numerical simulations the nonlinear dynamics of the elliptic instability in the configurations of a single strained vortex and a system of two counter-rotating vortices. We show that although a weakly nonlinear regime associated with a limit cycle is possible, the nonlinear evolution far from the instability threshold is, in general, much more catastrophic for the vortex. In both configurations, we put forward some evidence of a universal nonlinear transition involving shear layer formation and vortex loop ejection, leading to a strong alteration and attenuation of the vortex, and a rapid growth of the vortex core size.

scholarly journals Nonlinear dynamics of femtosecond supercontinuum generation with feedback

2009 ◽  
Vol 17 (18) ◽  
pp. 15827 ◽  
Author(s):  
Michael Kues ◽  
Nicoletta Brauckmann ◽  
Till Walbaum ◽  
Petra Groß ◽  
Carsten Fallnich
Keyword(s):  
Nonlinear Dynamics ◽  
Supercontinuum Generation

scholarly journals Numerical simulations of surf zone wave dynamics using Smoothed Particle Hydrodynamics

2019 ◽  
Vol 144 ◽  
pp. 101481 ◽  
Author(s):  
R.J. Lowe ◽  
M.L. Buckley ◽  
C. Altomare ◽  
D.P. Rijnsdorp ◽  
Y. Yao ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Smoothed Particle Hydrodynamics ◽  
Surf Zone ◽  
Wave Dynamics ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

scholarly journals Kinematical Evolution of the Pairwise Velocity Field of Galaxies

1999 ◽  
Vol 183 ◽  
pp. 265-265
Author(s):  
Naoki Seto ◽  
Jun'ichi Yokoyama
Keyword(s):  
Nonlinear Dynamics ◽  
Velocity Field ◽  
Numerical Simulations ◽  
Exponential Distribution ◽  
Relative Velocity ◽  
Statistical Distribution ◽  
Peculiar Velocity ◽  
Highly Nonlinear ◽  
Velocity Dispersions

It has been a long-standing cosmological issue to explain why the statistical distribution of the radial pairwise peculiar velocity of galaxies has an exponential shape rather than the Gaussian, as suggested by observations and explicitly shown by results of N-body simulations. Previous explanations on the exponential distribution are based on highly nonlinear dynamics of galactic systems (R < 1h–1 Mpc). That is, the exponential feature appears as a result of superposition of Gaussian velocity distributions in clumps with various velocity dispersions. Hence although this model is suitable to account for a symmetric exponential distribution with vanishing mean net relative velocity, a more elaborate treatment is necessary in order to reproduce an asymmetric exponential distribution with its peak at a negative relative velocity as observed in numerical simulations.

scholarly journals Nonlinear dynamics of turbulence driven magnetic islands. II. Numerical simulations

2017 ◽  
Vol 24 (4) ◽  
pp. 042309 ◽  
Author(s):  
O. Agullo ◽  
M. Muraglia ◽  
S. Benkadda ◽  
A. Poyé ◽  
N. Dubuit ◽  
...  
Keyword(s):  
Nonlinear Dynamics ◽  
Numerical Simulations ◽  
Magnetic Islands
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