LIQUID CRYSTAL OPTICAL SWITCH FOR OPTICAL SIGNAL HAVING ARBITRARY POLARIZATION
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United States of America Patent
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Issued Date -
Aug 26, 2010
app pub date -
Feb 25, 2009
filing date -
Feb 25, 2009
priority date (Note) -
Abandoned
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Abstract
An optical device performs both switching and attenuation of an optical beam, where the beam has an arbitrary combination of s-polarized and p-polarized components. The optical device includes a birefringent displacer, a liquid crystal (LC) beam-polarizing structure having six subpixels organized in a first polarization group and a second polarization group, a half-wave plate positioned for polarization control of the second polarization group, and a polarization separating and rotating assembly. The structure of the LC beam-polarizing structure allows for 1×2 switching and attenuation control with a single control signal. The optical device may be configured for processing multiple input light beams, such as the multiple wavelength channels de-multiplexed from a wavelength division multiplexed (WDM) optical signal.
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