Results 211 to 220 of about 38,577 (260)

Electrooptic polarization switch for multimode fibers

Applied Optics, 1977
An extensive theoretical analysis of an electrooptic polarization switch has been carried out. The main objective of the study is to ascertain whether it is possible to design such a switch with acceptable levels of optical crosstalk and control voltage if the device is used in conjunction with a multirmode optical fiber transmission system.
A R, Nelson, R A, Soref
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Polarization switching in a planar optical waveguide

Physical Review E, 2003
The multiscale expansion formalism is applied to the study of nonlinear planar optical waveguides. It allows us to describe the linear and nonlinear propagation for both transverse electric and transverse magnetic modes, and the interaction between them.
V, Boucher, H, Leblond, X, Nguyen-Phu
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Optical switching with photorefractive polarization holograms

Optics Letters, 1991
A switching technique that uses the polarization sensitivity of photorefractive holograms in crystals is experimentally demonstrated. The design is capable of handling a large number of 2 x 2 switching channels with only four holograms. The concept is applicable to either synchronous or asynchronous switching and also to a variety of photorefractive ...
Q W, Song, M C, Lee, P J, Talbot, E, Tam
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All-Optical Polarization Switching in Fibers

SPIE Proceedings, 1990
There has been recent progress in demonstrating the potential of all-optical devices for the switching of information on picosecond and subpicosecond time scales. In this paper we review the basic concepts of generic guided wave all-optical devices and discuss the material requirements. Fibers currently provide one of the best waveguiding media for all-
G. I. Stegeman, E. M. Wright, N. Finlayson, G. Assanto, W. C. Banyai, S. Trillo, WABNITZ, Stefan, R. H. Stolen   +7 more
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Quantum switching of polarization in mesoscopic ferroelectrics

Physical Review B, 1996
A single domain of a uniaxial ferroelectric grain may be thought of as a classical permanent memory. At the mesoscopic level this system may experience considerable quantum fluctuations due to tunneling between two possible memory states, thus destroying the classical permanent memory effect.
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Microstrip antenna with polarization switching

Microwave and Optical Technology Letters, 1994
AbstractIn this article the principle of an elementary printed antenna connected with an active hybrid coupler able to provide right‐ or left‐hand circular polarization is investigated. Dual‐gate MESFETs are used as phase shifters, and polarization switching is obtained by changing dc voltage applied to the control gate of each MESFET.
Stéphane Dauguet, Eric Ongareau, Jacques Wyrwinski   +2 more
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Asymmetry in mechanical polarization switching

Applied Physics Letters, 2017
Recent demonstration of a mechanical 180° switching of ferroelectric polarization has enabled an alternative polarization control mechanism based on the flexoelectric coupling between polarization and strain gradient. Mechanical switching is a highly asymmetric phenomenon associated with the inhomogeneous strain induced by an atomic force microscope ...
Haidong Lu, Shi Liu, Ziyu Ye, Shintaro Yasui, Hiroshi Funakubo, Andrew M. Rappe, Alexei Gruverman   +6 more
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Cross-polarization in dual polarization switching antennas

International Journal of RF and Microwave Computer-Aided Engineering, 2007
This paper presents the effect of the interaction between the switch and the antenna parameters on the cross-polarization of a dual polarization switching antenna. It is shown that the isolated antenna cross-polarization combines with the isolation of the switch giving place to a degradation of the polarization purity of the combined dual polarization ...
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Stability control of the polarization switching

SPIE Proceedings, 2013
ABSTRACT Pulse polarization switching is an important new method to eliminate the polarization-induced fading (PIF) in the interferometric fiber sensing system. An integrated Ti-indiffused LiNbO 3 Mach–Zehnder modulator is used to achieve high-speed switch of the polarization state by switching the voltage between two appropriate voltages applied to ...
Xiaobing Yin, Huizu Lin, Zhengliang Hu, Yongming Hu   +3 more
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Polarization switching in ferroelectric cathodes

Journal of Applied Physics, 1997
A new mechanism of polarization switching and electron emission in ferroelectric cathodes is proposed. Surface flashover plasma of a ferroelectric origin was observed on a polar ferroelectric surface [D. Shur, G. Rosenman, and Ya. E. Krasik, Appl. Phys. Lett. 70, 574 (1997)].
G. Rosenman, D. Shur, Kh. Garb, R. Cohen, Ya. E. Krasik   +4 more
openaire   +1 more source