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[IEEE 2019 21st International Conference on Transparent Optical Networks (ICTON) - Angers, France (2019.7.9-2019.7.13)] 2019 21st International Conference on Transparent Optical Networks (ICTON) - Excitation of Breather Solitons in a Mode-Locked Fibre Laser
摘要： We report on the generation and study of breathing dissipative solitons in a mode-locked fibre laser. Breathers exist in the laser cavity under the pump threshold of stationary mode locking. For the first time to our knowledge, breathing soliton molecules are also observed. Numerical simulations of the laser model support our experimental findings.
关键词： breather solitons,dissipative nonlinear systems,mode-locked fibre lasers
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Atlanta, GA, USA (2019.7.7-2019.7.12)] 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Modeling of Sub-Millimeter Wave Coplanar Waveguide Graphene Switches
摘要： In this paper, the output tracking problem for a large class of uncertain nonlinear systems with arbitrary integrator powers and nonlinearly parameterized unknown dynamics is addressed by employing an innovative tool called adding an universal power integrator (AUPI). By virtue of the AUPI methodology, flexible degrees of homogeneous are incorporated to mask rich diversities in integrator powers rather than simply positive odd integers involved in previous works. Moreover, a universal gain is adaptively updated according to the tracking error, which can converge into an arbitrarily small region including the origin, and thereby contributing to bounded but large enough controller gain and prescribed tracking accuracy. Numerical examples demonstrate the effectiveness of the proposed AUPI-based adaptive tracking control scheme.
关键词： universal adaptive control,integrator powers,adding an universal power integrator,Uncertain nonlinear systems
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - 25% cell efficiency with integration of passivating contact technology and interdigitated back contact structure on 6" wafers
摘要： In this paper, the output tracking problem for a large class of uncertain nonlinear systems with arbitrary integrator powers and nonlinearly parameterized unknown dynamics is addressed by employing an innovative tool called adding an universal power integrator (AUPI). By virtue of the AUPI methodology, flexible degrees of homogeneous are incorporated to mask rich diversities in integrator powers rather than simply positive odd integers involved in previous works. Moreover, a universal gain is adaptively updated according to the tracking error, which can converge into an arbitrarily small region including the origin, and thereby contributing to bounded but large enough controller gain and prescribed tracking accuracy. Numerical examples demonstrate the effectiveness of the proposed AUPI-based adaptive tracking control scheme.
关键词： universal adaptive control,integrator powers,adding an universal power integrator,Uncertain nonlinear systems
更新于2025-09-19 17:13:59
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Chaos Synchronization in Visible Light Communications with Variable Delays Induced by Multipath Fading
摘要： Visible Light Communication (VLC) uses light-emitting diodes to provide wireless connectivity in public environments. Transmission security in this emerging channel is not trivial. Chaotic modulation techniques can provide encryption directly in the physical layer based on the random-alike evolution and strong synchronization prospect given by deterministic chaos. In secure chaotic inclusion or embedding methods, continuous-time chaos oscillator models need to be synchronized via a coupling carrier. Here we present a ?rst numerical simulation study for the impact of the variable delays induced by line-of-sight and non-line-of-sight multipath fading in complete chaotic synchronization. More precisely, we analyze a chaotic Colpitts oscillator that is simultaneously transmitting the carrier to several mobile receivers via nine spotlights. Such induced delays depend on both the receiver position and the carrier frequency, in?uencing the complete synchronization required in modulation via chaotic inclusion. Correlation values for several receiver positions and carrier frequencies are presented, examining the progressive emergence of the multipath effect and its impact on chaotic synchronization. We show that, for the chaotic oscillator and coupling applied in the de?ned room settings, complete chaotic synchronization can be achieved and that it is robust up to the tens of MHz region.
关键词： multipath channels,network security,chaotic communication,visible light communication,nonlinear systems,chaos synchronization
更新于2025-09-04 15:30:14