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

A Novel Flux-Weakening Structure of High-Speed Permanent Magnet Motor Based on the Soft Ferrite

2013 ◽  
Vol 694-697 ◽  
pp. 1508-1511
Author(s):  
Xing Hua Wang ◽  
Xue Yuan Lin ◽  
Ming Hui Li ◽  
Yu Chen ◽  
Cheng Hui Zhang
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
High Resistivity ◽  
Permanent Magnet Motor ◽  
Soft Magnetic ◽  
Low Loss ◽  
Magnetic Resistance ◽  
The Magnetic Field ◽  
Soft Ferrite ◽  
Flux Weakening

Soft ferrite has the characteristics of high permeability, high resistivity, low loss. Based on this, a new flux-weakening structure of high-speed permanent magnet motor was presented. The structure relies on changing the saturation of soft magnetic ferrite to change the equivalent magnetic resistance of permanent magnet magnetic circuit in the motor, so the main flux of the permanent magnet motor can be reduced. By the 3D Finite Element analyses, the magnetic field distribution characters in the air gap can be pointed out. The analysis results prove the flux-weakening method is presented in this paper is correct and feasible. It can provide a practical flux-weakening method of the high-speed PM motor.

Ferrite Properties and Technology Issues for Improved Microwave Systems

2004 ◽  
Vol 833 ◽  
Author(s):  
Gerald F. Dionne ◽  
Daniel E. Oates
Keyword(s):  
High Speed ◽  
Uniaxial Anisotropy ◽  
Phase Shifters ◽  
Microwave Device ◽  
Low Loss ◽  
High Q ◽  
Magnetic Components ◽  
Ferrite Material ◽  
Tunable Resonators ◽  
Propagation Properties

ABSTRACTMicrowave device engineers continually seek materials advances to improve performance of magnetic components at reduced size and cost. Wherever possible, microstrip or stripline device configurations are adopted in preference to bulky waveguide structures. In radar and communications applications, the nonreciprocal propagation properties of ferrites are essential for realizing phase shifters, circulators, isolators, and power limiters. The introduction of superconductor circuits has led to the development of very low-loss phase shifters and circulators. Recent demonstrations of tuning reciprocal rf permeability by varying the state of magnetization at very low magnetic fields has led to the development of high-speed, high-Q tunable filters. In this paper, design issues of four classes of microwave device are reviewed from the standpoint of their ferrite material requirements: (1) low-loss microstrip phase shifters (2) microstrip tunable resonators, (3) self-biased microstrip circulators with normal or in-plane uniaxial anisotropy, and (4) high-power quasi-optical circulators.

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

Amorphous Silicon-Germanium-Boron Alloy Applied to Low-Loss and High-Speed Diodes

1982 ◽  
Vol 21 (Part 1, No. 11) ◽  
pp. 1559-1565 ◽  
Author(s):  
Katsumi Murase ◽  
Yoshihito Amemiya ◽  
Yoshihiko Mizushima
Keyword(s):  
Amorphous Silicon ◽  
Silicon Germanium ◽  
High Speed ◽  
Low Loss ◽  
Amorphous Silicon Germanium

Low loss, high-speed single-mode half-disk resonator

2014 ◽  
Vol 39 (13) ◽  
pp. 3810 ◽  
Author(s):  
Xinbai Li ◽  
Qingzhong Deng ◽  
Zhiping Zhou
Keyword(s):  
High Speed ◽  
Single Mode ◽  
Low Loss ◽  
Disk Resonator ◽  
Half Disk

High-Speed Low-Loss Schottky-i-n InP-Based Optical Modulator for RF Photonics

2007 ◽  
Vol 19 (5) ◽  
pp. 270-272 ◽  
Author(s):  
Jie Lin ◽  
Andreas Leven ◽  
N. G. Weimann ◽  
Y. Yang ◽  
R. F. Kopf ◽  
...  
Keyword(s):  
High Speed ◽  
Optical Modulator ◽  
Low Loss ◽  
Rf Photonics

Structure and Finite Element Analysis for a Permanent Magnet Bias Axial Magnetic Bearing

2011 ◽  
Vol 383-390 ◽  
pp. 4803-4809
Author(s):  
Xu Sheng Zhao ◽  
Zhi Quan Deng ◽  
Bo Wang ◽  
Chun Hua
Keyword(s):  
Finite Element ◽  
Permanent Magnet ◽  
High Speed ◽  
Magnetic Bearing ◽  
Magnetic Suspension ◽  
Low Loss ◽  
Theory Analysis ◽  
Element Analysis ◽  
Finite Element Software ◽  
Magnetic Field Simulation

A new permanent magnet bias axial magnetic bearing (PMAB) is introduced, then the structure and operation principle are analyzed. The equivalent magnetic circuit is established to deduce the mathematic expression. The parameter design and calculation of the magnetic bearing are presented including available area of magnetic pole, ampere - turns of control coils etc. The parameters of the proposed prototype are also given. The 3-D magnetic field simulation is performed by using the Finite Element software. The theory analysis and the simulation show that the maximum suspension magnetic force satisfies the design requirement. The magnetic suspension forces have better linearity and symmetry around the balanced position. Therefore, the proposed PMAB is suitable for the high speed or low loss occasions.

Test Results and Analytical Predictions for Rotor Drop Testing of an AMB Expander/Generator

2006 ◽  
Author(s):  
Lawrence Hawkins ◽  
Alexei Filatov ◽  
Shamim Imani ◽  
Darren Prosser
Keyword(s):  
High Speed ◽  
High Performance ◽  
Time History ◽  
Test Results ◽  
Direct Drive ◽  
Flow Loop ◽  
Low Loss ◽  
Model Predictions ◽  
Full Speed ◽  
Insight Into

A cryogenic gas expander system that incorporates a high performance, high-speed permanent magnet, direct-drive generator and low loss magnetic bearings is described. Flow loop testing to 30,000 rpm was completed at the system manufacturer’s facility in January 2005, and field installation is scheduled for October 2005. As part of the system testing, the rotor was dropped onto the backup bearings multiple times at an intermediate speed and at 30,000 rpm. Orbit and time-history data from a full speed drop and spin down are presented and discussed in detail. A transient, nonlinear rotordynamic analysis simulation model was developed for the machine to provide insight into the dynamic behavior. The model includes the dead band clearance, the flexible backup bearing support and hard stop. Model predictions are discussed relative to the test data.

Novel low-loss and high-speed diode utilizing an "Ideal" ohmic contact

1982 ◽  
Vol 29 (2) ◽  
pp. 236-243 ◽  
Author(s):  
Y. Amemiya ◽  
T. Sugeta ◽  
Y. Mizushima
Keyword(s):  
Ohmic Contact ◽  
High Speed ◽  
Low Loss
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