Optical: systems and elements – Polarization without modulation – Polarization by reflection or refraction
Reexamination Certificate
2006-12-26
2006-12-26
Assaf, Fayez G. (Department: 2872)
Optical: systems and elements
Polarization without modulation
Polarization by reflection or refraction
C359S490020, C359S490020
Reexamination Certificate
active
07154667
ABSTRACT:
A birefringent network can be formed from a pair of beam directing elements that sandwich a birefringent filter. One of the beam director elements can be a polarizing beam splitter and the other of the beam director elements can be a reflector or polarizing beam splitter. The polarizing beam splitters can be formed by an anisotropic material sandwiched between two isotropic pieces and can include optical films to couple both polarizations of light into and out of the beam splitters. The polarizing beam splitters also can be formed by anisotropic material on either side of an isotropic bow-tie piece, all of which is sandwiched a pair of isotropic pieces. A birefringent network also can be formed by a pair of bulk birefringent beam splitters sandwiching a birefringent filter. Little or no polarization mode dispersion occurs in these birefringent networks since all of the beams travel the same distances through the same elements.
REFERENCES:
patent: 6166838 (2000-12-01), Liu et al.
Birge Jonathan R.
Sharp Gary D.
Assaf Fayez G.
Baker & McKenzie LLP
ColorLink, Inc.
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