Normal Incidence Optical Switches Using Ferroelectric Liquid Crystals.
Patent Application, Filed 18 Mar 88,
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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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 at an angle of 90 deg normal incidence with the surface plane. Each FLC gives 0 or 90 deg optical rotation, depending upon the 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 below are voltage controlled 2 x 2, 1 x 4, 1 x 6, 1 x 8, 4 x 4, or N x N devices that use one or more layers of surface stabilized ferroelectric liquid crystals. Patent applications. JHD
- Fiber Optics and Integrated Optics
- Electrooptical and Optoelectronic Devices