Journal ArticleDOI
Liquid-crystal fiber-optic switch.
Reads0
Chats0
TLDR
An adjustable access coupler for multimode fiber-optic networks has been constructed, based on the voltage-tunable total-internal-reflection effect in nematic liquid crystals, using a achromatic four-port switch.Abstract:
An adjustable access coupler for multimode fiber-optic networks has been constructed, based on the voltage-tunable total-internal-reflection effect in nematic liquid crystals. Fibers are coupled via graded-index rod lenses at normal incidence to flint-glass prisms in contact with a 6-μm liquid-crystal layer. The achromatic four-port switch has a 1.6-dB optical insertion loss, a tap ratio controllable from −4.6 to −48 dB, a directionality of 44 dB, and an operating voltage of 5 to 20 V rms.read more
Citations
More filters
Journal ArticleDOI
Surface-stabilized ferroelectric liquid crystal electro-optics: New multistate structures and devices
Noel A. Clark,Sven T. Lagerwall +1 more
TL;DR: In this paper, surface-stabilized ferroelectric liquid crystal electro-optics have been studied in the context of multistate structures and devices, and they have been shown to have promising performance.
Journal ArticleDOI
Electrically controlled optical switch for multimode fiber applications
Richard E. Wagner,J. Cheng +1 more
TL;DR: An electrically controlled optical switch based on polarization principles is described, which uses a liquid crystal twist cell that rotates polarization by 90 degrees, and it operates on an ac voltage that switches between 0.8 and 2.5 V rms.
Journal ArticleDOI
Electrowetting optical switch
TL;DR: In this paper, continuous electrowetting and refractive index matching have been used as the physical basis of an optical switch for multimode fibers, which has low cross talk (∼−30 dB), fast response times and low operating voltage.
Journal ArticleDOI
Electrowetting switch for multimode optical fibers
TL;DR: In this article, an optical switch based on electrowetting and suitable for use with multimode fibers is described, with a 50-μm core, 0.23-N.A. measured fiber-to-fiber insertion loss at λ = 0.633 μm.
Journal ArticleDOI
Optofluidic 1x4 switch.
TL;DR: In this article, an optofluidic 1×4 switch is designed, fabricated, and tested based on a blazed diffraction grating imprinted onto silicone elastomer at the bottom of a microfluidic channel that is filled with liquids with different refractive indices.
References
More filters
Journal ArticleDOI
Electrically Controlled Birefringence of Thin Nematic Films
R. A. Soref,M. J. Rafuse +1 more
TL;DR: In this article, the authors report field-induced realignment of a nematic liquid crystal, which has a negative dielectric anisotropy, is initially homeotropic.
Journal ArticleDOI
Physical properties of new liquid-crystal mixtures and electrooptical performance in twisted nematic displays
M. Schadt,F. Muller +1 more
TL;DR: In this article, the elastic, dielectric, optical, and viscous properties of liquid-crystal mixtures for twisted nematic displays were reported, and good agreement was found between material properties of physically and chemically different mixtures and their static and dynamic electrooptical performance.
Journal ArticleDOI
Total-reflection liquid-crystal electrooptic device.
R. A. Kashnow,C. R. Stein +1 more
TL;DR: This paper describes a simple electrooptic effect that can be achieved by placing a thin nematic liquid crystal layer between two glass prisms of appropriate refractive index, for a range of angles of incidence on the prism-liquid crystal interface.
Journal ArticleDOI
Nematic liquid crystal digital light deflector.
G. Labrunie,S. Valette +1 more
TL;DR: A further experiment concerning the deflection of a colored image in incoherent white light is described, which shows that this device seems to be the more interesting for a lot of applications, especially portable ones.
Journal ArticleDOI
Optical switch for multimode optical-fiber systems.
TL;DR: A new type of optical switch is constructed of graded-index rod lenses operated mechanically by small electromagnets and has many outstanding features, such as low insertion loss, low crosstalk, and small size.