Apparatus for increasing directivity and lowering background light in tap detectors
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United States of America Patent
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Issued Date -
Apr 15, 2004
app pub date -
Oct 9, 2002
filing date -
Oct 9, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A tap detector monitors an optical signal propagating through a waveguide as a portion of the optical signal is tapped and directed to the monitor detector. A precisely formed grating structure formed within the waveguide surface causes a portion of the propagating optical signal to be coupled out of the waveguide at a particular angle. The grating structure produces an angular separation of light propagating through the waveguide in opposite directions and which is directed out of the waveguide by the grating structure. A monitor detector is positioned to detect the light tapped from the optical signal and to avoid being influenced by any other signals that may be propagating in a direction opposite the optical signal and that are diffracted out of the waveguide by the grating structure.
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