Enhanced coupling strength grating having a cover layer
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United States of America Patent
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Apr 14, 2020
Grant Date -
Nov 21, 2019
app pub date -
Jul 26, 2019
filing date -
Sep 5, 2013
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Abstract
The present invention includes an optical waveguide with a grating and a method of making the same for increasing the effectiveness of the grating. In one example, the grating is at least partially covered by a liner layer disposed on at least a portion of a grating; and a cover layer disposed on the liner layer, wherein a first material selected for the core and ridges and a second material selected for the liner layer are selected to provide a difference in the index of refraction between the first and second material that is sufficient to provide a contrast therebetween.
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