Liquid crystal optical device configured to reduce polarization dependent loss and polarization mode dispersion
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United States of America Patent
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May 14, 2013
Grant Date -
Aug 23, 2012
app pub date -
Mar 9, 2012
filing date -
May 29, 2009
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Abstract
An LC-based optical device compensates for differences in optical path lengths of polarization components of input beam. As a result, PDL and PMD of the optical device are reduced. The compensation mechanism may be a glass plate that is disposed in an optical path of a polarization component so that the optical path length of that polarization component can be made substantially equal to the optical path length of the other polarization component that traverses through a half-wave plate. Another compensation mechanism is a birefringent displacer that has two sections sandwiching a half-wave plate, wherein the two sections are of different widths and the planar front surface of the birefringent displacer can be positioned to be non-orthogonal with respect to the incident input light beam.
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