Multiple-core planar optical waveguides and methods of fabrication and use thereof
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United States of America Patent
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Jul 8, 2008
Grant Date -
Jun 14, 2007
app pub date -
Feb 22, 2007
filing date -
Apr 29, 2003
priority date (Note) -
Expired
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Abstract
A multiple-core planar optical waveguide comprises: a substantially planar waveguide substrate; a lower waveguide core; an upper waveguide core; lower cladding between the substrate and the lower waveguide core; middle cladding between the waveguide cores; and upper cladding above the upper waveguide core. Overlapping portions of the waveguide cores are positioned one above the other and substantially parallel. The lower, middle, and upper claddings have refractive indices less than refractive indices of the lower and upper waveguide cores. The widths of the waveguide cores are substantially larger their thicknesses along their overlapping portions. The overlapping portions of the waveguide cores jointly support a propagating optical mode.
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