Liquid crystal cells – elements and systems – Liquid crystal optical element – Beam dividing switch formed from liquid crystal cell
Reexamination Certificate
2009-04-30
2011-11-22
Stahl, Mike (Department: 2874)
Liquid crystal cells, elements and systems
Liquid crystal optical element
Beam dividing switch formed from liquid crystal cell
C349S193000, C385S016000, C385S018000, C385S022000, C385S140000
Reexamination Certificate
active
08064036
ABSTRACT:
An optical device has the structure to perform switching and attenuation of an optical beam with reduced polarization dependent loss (PDL). The optical device includes a birefringent displacer and two liquid crystal (LC) structures. The first LC structure is used to condition s-polarized components of the optical beam and the second LC structure is used to condition p-polarized components of the optical beam. Each LC structure has a separate control electrode so that the s-polarized components of the optical beam and the p-polarized components of the optical beam can be conditioned differently and in such a manner that reduces PDL. 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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International Search Report and Written Opinion dated Jul. 6, 2010, International Application No. PCT/US2010/033207.
Lin Christopher
Sun Ruipeng
Wang Ruibo
Yue Xuefeng
Oclaro (North America), Inc.
Patterson & Sheridan L.L.P.
Stahl Mike
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