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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) - Mitigation of the Variability of a PV Fleet via Geographical Dispersion and Energy Storage Systems on the Reunion Island Non-Interconnected Grid
摘要： In this paper, the geographical dispersion of PV installations and Energy Storage System (ESS) are studied to smooth PV production on Reunion Island. Despite the small area of the Island, the results show that with dispersion at the total grid scale, the variability driven by weather conditions (unpredictable variability) is almost removed. Then a centralized EES management at grid scale and a few large EES units could mitigate the variability even further with a relative low cost.
关键词： Photovoltaic systems,grid integration,ramps mitigation,geographical dispersion
更新于2025-09-23 15:21:01
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Nearly non-dispersive propagation of Pearceya??Gaussian pulses in optical fibers close to the zero dispersion point
摘要： The propagation of Pearcey–Gaussian (PeG) pulses in optical fibers close to the zero-dispersion wavelength point is investigated. It is found an interesting phenomenon that the PeG pulses maintain the envelopes for a sufficient long propagation distance under the co-action of the second- and third-order dispersions of the fiber. This phenomenon is due to the asymmetric distribution of the pulse spectrum, which allows the contributions from the second- and third-order dispersions having opposite signs within the entire spectrum and canceling each other during propagation. This finding may become new candidates for optical fiber telecommunication.
关键词： (PeG)pulses,Nonlinear optics,Optics fiber,Dispersion
更新于2025-09-23 15:21:01
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Random distributed feedback fiber lasers: Impact of third-order dispersion
摘要： In this paper, one of the most modern random lasers known as random distributed feedback ˉber laser is investigated when the third-order dispersion (TOD) is taken into account. The laser characteristics are simulated based on the nonlinear Schr€odinger equations (NLSEs) where the power evolution of three interacting waves: the pump, the forward and the backward Stokes waves, are investigated as they propagate down the ˉber. The results show that due to TOD, the output characteristics of the laser are changed and particularly, the output power becomes asymmetrical. Moreover, the impacts of ˉber nonlinear coe±cient and input power on the output power and the output spectrum are studied.
关键词： nonlinear Schr€odinger equations (NLSEs),third-order dispersion,Random distributed feedback ˉber laser
更新于2025-09-23 15:21:01
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Angular dispersion enhanced prebunch for seeding ultrashort and coherent EUV and soft X-ray free-electron laser in storage rings
摘要： Prebunching is an effective technique to reduce the radiation saturation length and to improve the longitudinal coherence and output stability in storage-ring-based free-electron lasers (FELs). A novel technique is proposed which uses angular dispersion to enhance the high-harmonic bunching with very small laser-induced energy spread. This technique can effectively reduce the radiation saturation length without significantly reducing the peak power of the FEL. Numerical simulations demonstrate that this technique can be used for the femtosecond generation of 100 MW scale level, fully temporal coherent extreme-ultraviolet and soft X-ray radiation pulses through a 10 m-long undulator based on a diffraction-limited storage ring.
关键词： angular dispersion,free-electron lasers,prebunching,storage rings,high-harmonic bunching,radiation saturation length,ultrashort,extreme-ultraviolet (EUV)
更新于2025-09-23 15:21:01
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Magneto-Electric Effect on Guided Waves in Functionally Graded Piezoelectric–Piezomagnetic Fan-Shaped Cylindrical Structures
摘要： Functionally graded piezoelectric–piezomagnetic (FGPP) material simultaneously consists of piezomagnetic and piezoelectric phases, which are able to convert energy among mechanical, electric, and magnetic fields. The magneto-electric effect on waves in FGPP fan-shaped cylindrical structures is studied by exploiting the double Legendre orthogonal polynomial method. By means of the Heaviside function, the initial conditions are brought into wave motion equations. Dispersion properties, electric and magnetic potential, and the Poynting vector are calculated. Subsequently, the effect of the graded variation and geometric size on wave characteristics is analyzed. The FGPP fan-shaped cylindrical structures are of complex geometrical shape and material inhomogeneity, so their influences on the magneto-electric effect are the focus of discussion. Results reveal that the cut-off frequencies have a negative relationship with the cross-section area of the structure. The magneto-electric effect could be adjusted via altering the geometric size of the cross-section. These results can be utilized to design and optimize piezoelectric–piezomagnetic fan-shaped transducers.
关键词： dispersion curves,the Poynting vectors,functionally graded piezoelectric–piezomagnetic material,magneto-electric effect,fan-shaped cross-section
更新于2025-09-23 15:21:01
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New approach to detection of guided waves with negative group velocity: Modeling and experiment
摘要： A new method for detecting the forward and backward acoustic waves in the piezoelectric plates by using a system of the acoustically isolated interdigital transducers (IDT) with the different spatial period is developed. This method was tested on the piezoelectric acoustic modes A1 and SH1 propagating in Y-X LiNbO3 plate. Theoretical analysis has shown that the SH1 mode in the entire frequency range represented a forward wave. At that the dispersion dependence of the A1 mode near the cutoff frequency has a smooth transition from a forward wave to a backward one with decreasing frequency. In order to experimentally observe this transition 19 IDTs with different periods were deposited on a single lithium niobate plate. The measurement of the frequency dependence of the real part of the electrical impedance of these IDTs showed that for SH1 mode the resonance frequency decreased monotonically with a growth in the spatial period. This behavior corresponded to a forward wave. For A1 mode the resonance frequency initially decreased with the growth of the IDT period and then began to increase after reaching a value of ZGV frequency. This behavior is explained by the smooth transition from the region of the forward wave to the region of the backward wave. The calculation of the frequency dependences of the real part of the electrical impedance of each transducer for the waves considered, carried out by the finite element method, turned out to be in good agreement with the experiment.
关键词： interdigital transducer,forward and backward plate acoustic wave,phase and group velocities,dispersion dependencies,finite element analysis,electrical impedance
更新于2025-09-23 15:21:01
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Raman spectrum of nanocrystals: Phonon dispersion splitting and anisotropy
摘要： The effects of anisotropy and splitting of the phonon dispersions in the Raman spectrum of nanocrystals are investigated. We describe the different branches of the optical phonon dispersion curves along each high-symmetry direction by fitting a simple empirical model to experimental data. These curves are then used to calculate the Raman spectrum in the framework of the phonon confinement model and the results are compared with a wide range of available experimental data as well as with the spectra predicted by currently available models based on a single isotropic dispersion curve. We show that by considering the anisotropy and splitting of rigorously obtained optical phonon dispersions, the commonly observed deviations between experimental and theoretical data are strongly reduced. Our work enables the extraction of significantly more accurate information about relevant physical properties of nanocrystals from Raman spectroscopy.
关键词： splitting,anisotropy,nanocrystals,phonon dispersion,Raman spectrum
更新于2025-09-23 15:21:01
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Invited Article: Emission of intense resonant radiation by dispersion-managed Kerr cavity solitons
摘要： We report on an experimental and numerical study of temporal Kerr cavity soliton dynamics in dispersion-managed fiber ring resonators. We find that dispersion management can significantly magnify the Kelly-like resonant radiation sidebands emitted by the solitons. Because of the underlying phase-matching conditions, the sideband amplitudes tend to increase with increasing pump-cavity detuning, ultimately limiting the range of detunings over which the solitons can exist. Our experimental findings show excellent agreement with numerical simulations.
关键词： phase-matching conditions,temporal Kerr cavity solitons,dispersion-managed fiber ring resonators,pump-cavity detuning,resonant radiation sidebands
更新于2025-09-23 15:21:01
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A size-dependent micropolar-piezoelectric layered structure for the analysis of love wave
摘要： The propagation characteristics of Love wave form an essential basis for designing highly sensitive microacoustic devices for sensing applications. In this paper, the propagation of Love wave in a micropolar-piezoelectric structure is investigated with the objective of enhancing the performance of Love wave-based devices. A study has been carried out by using two sets of a piezoelectric material, i.e. PZT-5H and BaTiO3 material. The closed-form expression of the dispersion relations is derived analytically for electrically open and electrically short conditions. The effects of internal microstructures of the micropolar elastic half-space, the thickness of a piezoelectric layer, the piezoelectric constants, and the dielectric constants are illustrated graphically on the phase velocity for both the considered materials of the piezoelectric layer under electrically open and short conditions.
关键词： Piezoelectricity,Love wave,micropolar,characteristic length,dispersion relation
更新于2025-09-23 15:21:01
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Technology Roadmap for Time Division Multiplexed Passive Optical Networks (TDM PONs)
摘要： Commercial passive optical networks (PONs) up to 10 Gb/s have traditionally leveraged mature components from transport and metro transport systems. Starting soon with 25G PON, the data center ecosystem will be leveraged. A strategy to accommodate the higher speed of 25 Gb/s at low incremental cost to 10G PON is presented—essentially to adhere to a simple architecture and to avoid the need for expensive optical amplification. The 25G PON wavelength plan and co-existence scenarios with existing PONs are described. The ability of Time Division Multiplexed (TDM) PONs to address the 5G backhaul, midhaul and fronthaul transport use case is evaluated. The technology roadmap to a future 50G TDM PON is discussed. Analysis of the major challenge, meeting PON loss budgets at 50 Gb/s with higher launch power, is presented, including the cost dependence of transmitter power. This is followed by a short review of research in the field of coherent detection in PON systems, which will be important for 100G PON.
关键词： SOA,modulation,dispersion,25G,50G,PON,passive optical networks,coherent,bandwidth,100G
更新于2025-09-23 15:21:01