32 Gbit/s multimode fibre transmission using high-speed, low current density 850 nm VCSEL

2009 ◽  
Vol 45 (7) ◽  
pp. 366 ◽  
Author(s):  
P. Westbergh ◽  
J.S. Gustavsson ◽  
Å. Haglund ◽  
A. Larsson ◽  
F. Hopfer ◽  
...  
Keyword(s):  
Current Density ◽  
High Speed ◽  
Fibre Transmission

Low loss fibre transmission of high speed pulse signals at 1.29 μm wavelength

1978 ◽  
Vol 14 (6) ◽  
pp. 187 ◽  
Author(s):  
Masatoshi Saruwatari ◽  
Koichi Asatani ◽  
Jun-Ichi Yamada ◽  
Iwao Hatakeyama ◽  
Koichi Sugiyama ◽  
...  
Keyword(s):  
High Speed ◽  
Low Loss ◽  
Fibre Transmission

Estimation of Time Variation of Current Density in a 50 kA Lightning Impulse Arc using High Speed Cameras

2021 ◽  
Author(s):  
Tomoyuki Nakano ◽  
Masashi Kotari ◽  
Toshiya Ohtaka ◽  
Yutaka Goda ◽  
Mikimasa Iwata
Keyword(s):  
Current Density ◽  
Time Variation ◽  
High Speed ◽  
Lightning Impulse ◽  
Estimation Of Time

Study on the High Speed Jet-Electrode Position Ni-P Alloy

2013 ◽  
Vol 567 ◽  
pp. 39-44
Author(s):  
Ying Wang ◽  
Min Kang ◽  
Yong Yang ◽  
Xiu Qing Fu
Keyword(s):  
Grain Size ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
High Speed ◽  
Electrode Position ◽  
Stirring Intensity

The high speed jet-electrodepositing equipment was used to prepare Ni-P alloy in substrate of 45 steel. The influences of current density on depositing rate, hardness of deposit and microstructure of Ni-P alloy were studied, and the comparation with that of conventional electroplating were studied. The results show that with the increase of stirring intensity of the electrolyte, the thickness of diffused layer decreases, the critical current density increases, and then the depositing rates increase to 69.82/min. A linear increasing of the depositing rate with the increase of current density is observed, and it refines grain size obviously. Deposit hardness up to 679HV.

10 Gbit/s, 100 km optical fibre transmission experiment using high-speed MQW DFB-LD and back-illuminated GaInAs APD

1989 ◽  
Vol 25 (11) ◽  
pp. 702-703 ◽  
Author(s):  
S. Fujita ◽  
M. Kitamura ◽  
T. Torikai ◽  
N. Henmi ◽  
H. Yamada ◽  
...  
Keyword(s):  
Optical Fibre ◽  
High Speed ◽  
Transmission Experiment ◽  
Fibre Transmission ◽  
S 100 ◽  
Optical Fibre Transmission ◽  
Back Illuminated

scholarly journals Quasi-ballistic carbon nanotube array transistors with current density exceeding Si and GaAs

2016 ◽  
Vol 2 (9) ◽  
pp. e1601240 ◽  
Author(s):  
Gerald J. Brady ◽  
Austin J. Way ◽  
Nathaniel S. Safron ◽  
Harold T. Evensen ◽  
Padma Gopalan ◽  
...  
Keyword(s):  
Current Density ◽  
High Speed ◽  
Field Effect Transistors ◽  
Ballistic Transport ◽  
Oxide Thickness ◽  
Semiconductor Electronics ◽  
Conductance Limit ◽  
Previous State ◽  
Parallel Arrays ◽  
Array Performance

Carbon nanotubes (CNTs) are tantalizing candidates for semiconductor electronics because of their exceptional charge transport properties and one-dimensional electrostatics. Ballistic transport approaching the quantum conductance limit of 2G0 = 4e2/h has been achieved in field-effect transistors (FETs) containing one CNT. However, constraints in CNT sorting, processing, alignment, and contacts give rise to nonidealities when CNTs are implemented in densely packed parallel arrays such as those needed for technology, resulting in a conductance per CNT far from 2G0. The consequence has been that, whereas CNTs are ultimately expected to yield FETs that are more conductive than conventional semiconductors, CNTs, instead, have underperformed channel materials, such as Si, by sixfold or more. We report quasi-ballistic CNT array FETs at a density of 47 CNTs μm−1, fabricated through a combination of CNT purification, solution-based assembly, and CNT treatment. The conductance is as high as 0.46 G0 per CNT. In parallel, the conductance of the arrays reaches 1.7 mS μm−1, which is seven times higher than the previous state-of-the-art CNT array FETs made by other methods. The saturated on-state current density is as high as 900 μA μm−1 and is similar to or exceeds that of Si FETs when compared at and equivalent gate oxide thickness and at the same off-state current density. The on-state current density exceeds that of GaAs FETs as well. This breakthrough in CNT array performance is a critical advance toward the exploitation of CNTs in logic, high-speed communications, and other semiconductor electronics technologies.

A Novel Surface Preparation and Post-Etch Removal Technique for InGaAs Sidewalls

1997 ◽  
Vol 477 ◽  
Author(s):  
S. A. Tabatabaei ◽  
G. A. Porkolab ◽  
S. Agarwala ◽  
F. G. Johnson ◽  
S. A. Merritt ◽  
...  
Keyword(s):  
Current Density ◽  
Dark Current ◽  
High Speed ◽  
Surface Preparation ◽  
Reverse Bias Voltage ◽  
Dark Current Density ◽  
Term Stability ◽  
Long Term Stability ◽  
Removal Technique

ABSTRACTThis paper describes in detail a surface preparation, and post-etch removal technique developed for InGaAs sidewalls. It illustrates the results demonstrating the effect of sidewall post-etch, surface preparation, and surface passivation on the performance of high speed InGaAs detectors. Dark current density for circular diodes with a diameter size varying between 10 and 100 μm was measured at a reverse bias voltage of −5 V. The effectiveness of various surface preparation techniques was studied by measuring the immediate improvement in dark current density, as well as its long-term stability. The benefits of this new technique compared to other techniques we have investigated include improved device characteristics, long-term stability, as well as a much less critical process to achieve optimum surface properties.

scholarly journals Electrodynamic Parameters of a Coaxial Cable at Bipolar Pulses Propagation

2020 ◽  
pp. 25-37
Author(s):  
Yanis I. Bulbik ◽  
Fedor G. Zograf
Keyword(s):  
Boundary Conditions ◽  
Density Distribution ◽  
Current Density ◽  
High Speed ◽  
Surface Current ◽  
Current Density Distribution ◽  
Coaxial Cable ◽  
Surface Current Density ◽  
Speed Increase ◽  
Outer Conductor

All-in-interworking technology, based on IEEE 802.3 standard, was mainly developed for the separable media cabling and data transmission speed increase. Although the high-speed networking is already provided by a fiber optic cable, coaxial guides are in demand for similar applications. Time-domain analysis is undertaken to estimate electrodynamic states of inner and outer guiding conductors at periodic bipolar pulses propagation on a coaxial cable. An electric current density distribution on the cross-section of the inner conductor is obtained from a solution of Maxwell equations under periodic boundary conditions that are prescribed by a product of two functions. The first one is introduced implicitly for a profile of surface current density in the axial direction, while the other determines this profile transient states. As for shielding braid, which is the cable outer conductor, its current density distribution is derived from an analysis of field harmonics that penetrate into conductive subsurface layers under similar boundary conditions. It is also shown that prescribed implicative boundary conditions for both conductors allow to obtain, at least under auxiliary assumption, some completed formulae useful to the estimation of the pulses duration admissible decrease at their transmission on the coaxial cable. The paper contains some comparative and numerical results as well

scholarly journals Estimation of Current Density Using High-Speed-Camera Recordings in a Model Spark Gap during Surge Currents

2019 ◽  
Vol 6 (1) ◽  
pp. 60-64
Author(s):  
T. H. Kopp ◽  
E. Peters ◽  
M. Kurrat
Keyword(s):  
Current Density ◽  
Radiation Intensity ◽  
High Speed ◽  
Experimental Investigations ◽  
High Speed Camera ◽  
Spark Gap ◽  
Plasma State ◽  
Development Processes ◽  
Current Densities ◽  
Short Time

<p>For experimental investigations of short time plasma in spark gaps, as used in surge protective devices, high-speed camera recordings are used frequently. The analysis of these recordings provides further details regarding the plasma state and distribution. These deduced details are used to assist research and development processes. <br />To increase the benefit of high-speed camera recordings an empirical model is presented to improve the picture analysis. In this model the recorded radiation intensity is empirically related to the current density within a spark gap. Therefore a specially adapted model spark gap was developed and tested. In this model spark gap areas with homogenous current densities occur. These current densities are determined in the experimental setup through current measurements with separated electrodes. Additionally, the relative radiation intensity between the electrodes is identified using high-speed camera recordings. An empirical correlation between these two measurement values was found and is discussed. <br />It confirmed that the determined correlation improve the mostly intuitive interpretation of high speed camera recordings in spark gaps.</p>

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