Tunable optical filters
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United States of America Patent
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Issued Date -
Jun 2, 2011
app pub date -
Sep 17, 2008
filing date -
Sep 17, 2008
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Abandoned
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Abstract
The specification describes tunable optical filters improved according to the invention by designing the optical system architecture to provide a double pass of the signal being analyzed through the tunable optical filter. The benefit of double passes through the tunable optical filter is narrower linewidth and better adjacent and non-adjacent channel isolation. The invention may be implemented with any tunable optical filter which is reciprocal. The optical system architecture is preferably an optical performance monitor for a WDM system.
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