Optical switch attenuator
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United States of America Patent
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-
Oct 18, 1983
Grant Date -
N/A
app pub date -
Sep 3, 1981
filing date -
Sep 3, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical switch having low insertion loss and low crosstalk is provided by two slabs of birefringent material having a polarization rotator as a control element interposed therebetween. By controlling the polarization rotator electrically, a selectable ratio of transmitted-to-displaced output optical power is realized. The optical switch therefore can function as an attenuator to a light beam traversing through it. In the preferred embodiment calcite crystals are used for the slabs, and a liquid crystal cell for the polarization rotator.
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