Stray light absorber including grating array
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United States of America Patent
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Jan 24, 2006
Grant Date -
Nov 11, 2004
app pub date -
Feb 12, 2004
filing date -
Feb 14, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical component comprising an optical waveguide and adjacent to it at least one grating array adapted to reflect stray light away from said optical waveguide. The use of a grating array with a plurality of structures like polygons or stripes gives the possibility to define a multiple of reflection directions. This is obtained by using polygons layed out in different orientations up to a random one or a Bragg grating preferably defined with a non-uniform period (chirped). Such grating arrays are usually structured within the same layer as the optical waveguide core layer.
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