Accession Number : ADD014100

Title :   Optical Switches Using Ferroelectric Liquid Crystals.

Descriptive Note : Patent Application, Filed 15 Feb 89,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Soref, Richard A

Report Date : 15 Feb 1989

Pagination or Media Count : 40

Abstract : This invention comprises a new group of fiber optic switching devices that use layers of surface-established ferroelectric liquid crystals (FLCs) as the switching media. In each of the devices light impinges upon the ferroelectric liquid crystal a an angle of 90 degrees (normal incidence) with the surface plane. Each FLC gives 0 degrees or 90 degree optical rotation, depending upon he polarity of the electric voltage applied. A series of polarizing beam splitters are used to separate unpolarized light into its s and p polarization components. After ferroelectric liquid crystal switching, other polarizing beam splitters are used to direct the s and p light to output optical paths. The switches discussed include voltage controlled 2 x 2, 1 x 4, 1 x 6, 1 x 8, 4 x 4 and dual plane devices that use one or more layers of surface stabilized ferroelectric liquid crystals to direct optical signals. Patent application. (jhd)

Descriptors :   *FERROELECTRIC CRYSTALS, *LIQUID CRYSTALS, *OPTICAL SWITCHING, *PATENT APPLICATIONS, *SWITCHES, BEAM SPLITTING, FERROELECTRICITY, FIBER OPTICS, LIGHT, OPTICS, OUTPUT, PATHS, POLARIZATION, SIGNALS, VOLTAGE

Subject Categories : Electrooptical and Optoelectronic Devices
      Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE