Angle tunable thin film interference optical filter for wavelength multiplexing
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United States of America Patent
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Issued Date -
Jul 8, 2004
app pub date -
Sep 3, 2003
filing date -
Sep 3, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An angle tunable thin film interference optical filter for wavelength multiplexing and demultiplexing. The optical filter may be used in an OADM to drop one or more target channels from an optical signal without interfering with any channels between a starting channel and the dropped channels. During tuning, all of the channels in the optical signal are expressed. In one embodiment of the optical filter, a filter is fixedly coupled to a tiltable filter stage. Reflections from the filter are collected by a corner mirror for reflection back to the filter. In another embodiment, a plurality of optical elements are coupled to rotationally coupled carousels. In another embodiment, tunable thin film interference optical filters are coupled to rotationally independent carousals for expanded wavelength coverage.
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