High-speed fourth-order photonic differentiator based on silicon self-coupled optical-waveguide resonator

2014 ◽  
Author(s):  
Jiayang Wu ◽  
Pan Cao ◽  
Ting Pan ◽  
Xiaofeng Hu ◽  
Xinhong Jiang ◽  
...  
Keyword(s):  
Optical Waveguide ◽  
Fourth Order ◽  
High Speed ◽  
Waveguide Resonator

scholarly journals Effect of the turning characteristics of underfloor wheel lathes on the evolution of wheel polygonisation

2018 ◽  
Vol 233 (5) ◽  
pp. 479-488 ◽  
Author(s):  
Dabin Cui ◽  
Boyang An ◽  
Paul Allen ◽  
Ruichen Wang ◽  
Ping Wang ◽  
...  
Keyword(s):  
Fourth Order ◽  
High Speed ◽  
Higher Order ◽  
Ride Quality ◽  
Sustained Use ◽  
High Speed Trains ◽  
Cut Quality ◽  
Multiple Unit ◽  
Component Failures

During both running and wheel cut operations, wheels of railway vehicles and the friction rollers that support and drive the wheelset on a typical wheel cut lathe are subject to wear and hence are likely to develop out-of-round characteristics after sustained use. The resulting out-of-round wheels can significantly affect the ride quality and can potentially increase the incidence of fatigue-related component failures due to the resulting higher intensity loading cycles. Furthermore, the corresponding out-of-round characteristics of the lathe's friction rollers will continue to degrade the subsequent cut quality of wheels. For the analysis of the out-of-round characteristics caused by an underfloor wheel lathe used for the high-speed trains in China, a mathematical model based on a typical electric multiple unit (EMU) vehicle's wheelsets and their interactions with the wheel lathe friction rollers was established. Factors influencing the cut quality of the wheels, including the number of cuts, eccentricity forms of the friction rollers and the longitudinal spacing of the two rollers, have been analysed. The results show that two cuts can effectively remove the higher order polygon on the wheel surface. The eccentricity and phase angle of the friction rollers have no influence on the cut quality of higher order polygons, whereas they are the primary cause for the fourth-order polygons. The severity of the fourth-order polygon depends on the level and the phase of the eccentricity of the friction rollers. The space of the two rollers can also significantly affect the cut quality. Obtaining the theoretical and practical value for the maintenance of polygonised wheels using the underfloor lathe is the main outcome of this study.

Research of a New All-Optical Solid-State Scanner Based on GaAs

2013 ◽  
Vol 710 ◽  
pp. 269-272
Author(s):  
Guo Ya Xu ◽  
Jun Hua He ◽  
Fan Sen ◽  
Yuan Tao Zhu
Keyword(s):  
Solid State ◽  
Optical Waveguide ◽  
High Speed ◽  
Refractive Index Change ◽  
Core Layer ◽  
Beam Deflection ◽  
Optical Scanning ◽  
Signal Light ◽  
Change Effect ◽  
All Optical

Design an all-optical solid-state scanner chip, which can realize high speed light deflection in a very small space, instead of electron beam deflection scan image converter tube and opto-mechanical scanner, cancel the complicated mechanical components, use the all-optical scanning to realize the super fast phenomenon observation. The beam deflection system is based on semiconductor optical waveguide core layer carrier induced refractive index change effect to realize, its development work is mainly divided into semiconductor optical waveguide and saw prisms two parts. And through the experiment, we measured deflection angle of the scanner chip to 1053nm signal light.

High-isolation diplexer based on dual-mode substrate integrated waveguide resonator

2019 ◽  
Vol 12 (4) ◽  
pp. 288-292
Author(s):  
Kaijun Song ◽  
Mou Luo ◽  
Cuilin Zhong ◽  
Yuxuan Chen
Keyword(s):  
Fourth Order ◽  
Equivalent Circuits ◽  
Substrate Integrated Waveguide ◽  
Waveguide Resonator ◽  
Dual Mode ◽  
Third Order ◽  
High Isolation ◽  
Operating Modes ◽  
Mode Resonator

AbstractA high-isolation diplexer based on a dual-mode substrate integrated waveguide (SIW) resonator is proposed in this paper. Based on the theory of the dual-mode resonator, the miniaturized diplexers are designed by using the SIW dual-mode resonators. The superior isolation of the diplexers is obtained because the two operating modes of the dual-mode SIW resonators are not directly coupled and there is no interference with each other. In order to further improve the isolation of the circuit, the number of the order of the diplexer is added. Equivalent circuits are given to analyze and design the dual-mode high-isolation diplexers. Detailed analyses are given according to the equivalent circuits. The dual-mode third-order and fourth-order diplexers are designed and fabricated. The measured results agree well with the simulated ones. The total sizes of the fabricated third-order and fourth-order diplexers are 1.78λg × 2.64λg and 1.79λg × 3.63λg, respectively.

Design of optimized high‐speed depletion‐edge‐translation optical waveguide modulators in III‐V semiconductors

1987 ◽  
Vol 51 (11) ◽  
pp. 792-794 ◽  
Author(s):  
L. A. Coldren ◽  
J. G. Mendoza‐Alvarez ◽  
R. H. Yan
Keyword(s):  
Optical Waveguide ◽  
High Speed ◽  
Waveguide Modulators

High-order moments of Reynolds shear stress fluctuations in a turbulent boundary layer

1973 ◽  
Vol 58 (3) ◽  
pp. 581-593 ◽  
Author(s):  
R. A. Antonia ◽  
J. D. Atkinson
Keyword(s):  
Boundary Layer ◽  
Shear Stress ◽  
Turbulent Boundary Layer ◽  
Fourth Order ◽  
High Speed ◽  
Reynolds Shear Stress ◽  
Digital Data ◽  
Normal Velocity ◽  
The Third ◽  
Digital Data Acquisition System

The cumulant-discard approach is used to predict the third- and fourth-order moments and the probability density of turbulent Reynolds shear stress fluctuations uv, the streamwise and normal velocity fluctuations being represented by u and v respectively. Measurements of these quantities in a turbulent boundary layer are presented, with the required statistics of uv obtained by the use of a high-speed digital data-acquisition system. Including correlations between u and u up to the fourth order, the cumulant-discard predictions are in close agreement with the measurements in the inner region of the layer but only qualitatively follow the experimental results in the outer intermittent region. In this latter region, predictions for the third- and fourth-order moments of uv are also obtained by assuming that the properties of both turbulent and irrotational fluctuations are Gaussian and by using some of the available conditional averages of u, v and uv.

Some measurements of multi-point time correlations in grid turbulence

1970 ◽  
Vol 41 (1) ◽  
pp. 169-178 ◽  
Author(s):  
C. W. Van Atta ◽  
T. T. Yeh
Keyword(s):  
Fourth Order ◽  
High Speed ◽  
Longitudinal Velocity ◽  
Joint Probability ◽  
Grid Turbulence ◽  
Odd Order ◽  
Probability Densities ◽  
Even Order ◽  
Point Correlation ◽  
Non Gaussian

Three-point odd-order correlations and four-point even-order correlations of the longitudinal velocity fluctuations in grid-generated turbulence have been measured using linearized hot-wire anemometry, digital sampling, and a high-speed digital computer. The measured correlations are compared with relations between higher-order correlations corresponding to non-Gaussian Gram-Charlier joint probability densities for three and four variables. The fourth-order, three-point Gram-Charlier distribution accurately describes the relation between measured odd-order three-point correlations. The measured fourth-order even-order correlations may be accurately predicted from the two-point correlation using Millionshtchikov's joint-Gaussian hypothesis, except for small values of the separations. The disagreement at small separations cannot be reduced through use of the Gram-Charlier approximation.

Electro-optic and dielectric characterization of ferroelectric films for high-speed optical waveguide modulators

2011 ◽  
Vol 109 (12) ◽  
pp. 124108 ◽  
Author(s):  
Shin Masuda ◽  
Atsushi Seki ◽  
Kazunori Shiota ◽  
Hideo Hara ◽  
Yoichiro Masuda
Keyword(s):  
Optical Waveguide ◽  
High Speed ◽  
Ferroelectric Films ◽  
Dielectric Characterization ◽  
Electro Optic ◽  
Waveguide Modulators
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