Structure and method for coupling light between dissimilar waveguides
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United States of America Patent
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Jul 25, 2006
Grant Date -
Apr 10, 2003
app pub date -
Sep 10, 2002
filing date -
Sep 10, 2001
priority date (Note) -
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Abstract
A strip loaded waveguide comprises a slab and a strip, wherein the strip is separated from the slab. Nevertheless, a guiding region is provided for propagating an optical mode and this guiding region extends both within the strip and the slab. A layer of material having an index of refraction lower than that of the strip and the slab may be disposed between and separate the strip and the slab. In one embodiment, the slab comprises a crystalline silicon, the strip comprises polysilicon or crystalline silicon, and the layer of material therebetween comprises silicon dioxide. Such waveguides may be formed on the same substrate with transistors. These waveguides may also be electrically biased to alter the index of refraction and/or absorption of the waveguide.
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