TUNABLE OPTICAL FILTERS WITH LIQUID CRYSTAL RESONATORS
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United States of America Patent
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Issued Date -
Oct 25, 2012
app pub date -
Apr 20, 2011
filing date -
Apr 20, 2011
priority date (Note) -
Abandoned
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Abstract
A voltage-tuned optical filter that is low cost and simple to fabricate uses cascaded etalon modules, each module comprising a liquid crystal etalon, such as a Fabry-Perot etalon, having a relatively small Free Spectral Range (FSR). At least two of the modules are provided with a voltage control to enable Vernier tuning control. For a given overall scan, the voltage-tuned optical filter may operate with reduced voltage ranges for each liquid crystal etalon.
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