Broadband, group index independent, and ultra-low loss coupling into slow light slotted photonic crystal waveguides
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United States of America Patent
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Oct 27, 2015
Grant Date -
Aug 7, 2014
app pub date -
Jun 13, 2012
filing date -
Jun 13, 2011
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Abstract
The present invention provides a waveguide coupler configured to optically couple a strip waveguide to a first slot photonic crystal waveguide, wherein the slot photonic crystal waveguide has a lattice constant, an air hole diameter, a slot width and a first line defect waveguide width. The waveguide coupler includes a group reflective index taper having a second slot photonic crystal waveguide disposed between and aligned with the first slot photonic crystal waveguide and the strip waveguide. The second slot photonic crystal waveguide has a length, the lattice constant, the air hole diameter, the slot width, and a second line defect waveguide width that is substantially equal to the first line defect waveguide width adjacent to the first slot photonic crystal waveguide and decreases along the length of the second photonic crystal waveguide.
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