Optical: systems and elements – Polarization without modulation – Polarization using a time invariant electric – magnetic – or...
Patent
1997-09-03
2000-01-04
Shafer, Ricky D.
Optical: systems and elements
Polarization without modulation
Polarization using a time invariant electric, magnetic, or...
359495, 359497, 359282, 385 11, G02B 530, G02F 109
Patent
active
060116498
ABSTRACT:
An optical assembly, such as a circulator, for selectively coupling first and third input/output windows at a forward end with a second input/output window at a rearward end includes a first group of optical elements that establish a desired orientation of polarization components for first and third beams that are respectively introduced via the first and third windows. In the preferred embodiment, the desired orientation is one in which the orthogonal polarization components of the third beam are shifted to locations on opposite sides of aligned polarization components of the first beam. A second functionally related group of optical elements functions as a polarization-dependent isolator for coupling the first beam to the second window and coupling an input beam from the second window to the rearward face of the first group of optical elements such that a rearwardly propagating beam from the second window is coupled to the third window. In the preferred embodiment, the first group of optical elements includes both a polarization mixer and a polarization combiner. In another embodiment, the first group is a pair of split optical members, with each member having an optically neutral portion and a walk-off portion. In a third embodiment, the first group includes the polarization mixer of the preferred embodiment, but not the polarization combiner.
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Hewlett--Packard Company
Shafer Ricky D.
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