US 12,449,599 B2
Directional couplers with heterogenous claddings
Yusheng Bian, Ballston Lake, NY (US)
Assigned to GlobalFoundries U.S. Inc., Malta, NY (US)
Filed by GlobalFoundries U.S. Inc., Malta, NY (US)
Filed on Jan. 13, 2023, as Appl. No. 18/096,607.
Prior Publication US 2024/0241314 A1, Jul. 18, 2024
Int. Cl. G02B 6/125 (2006.01); G02B 6/12 (2006.01); G02B 6/124 (2006.01); G02B 6/13 (2006.01); G02B 6/28 (2006.01); G02B 6/34 (2006.01); G02F 1/313 (2006.01); G02B 6/293 (2006.01)
CPC G02B 6/125 (2013.01) [G02B 6/12004 (2013.01); G02B 6/124 (2013.01); G02B 6/13 (2013.01); G02B 6/2821 (2013.01); G02B 6/34 (2013.01); G02F 1/3132 (2013.01); G02B 2006/12147 (2013.01); G02B 6/29338 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A structure for a directional coupler, the structure comprising:
a first waveguide core including a first plurality of segments, each of the first plurality of segments having a first sidewall and a second sidewall opposite to the first sidewall;
a second waveguide core including a second plurality of segments, each of the second plurality of segments having a first sidewall and a second sidewall opposite to the first sidewall, the second plurality of segments spaced from the first plurality of segments by a first gap in a coupling region, and the first sidewall of each of the second plurality of segments disposed across the first gap from the first sidewall of one of the first plurality of segments in the coupling region;
a first cladding layer comprising a first dielectric material that has a first refractive index, the first cladding layer adjoining the first sidewall of each of the first plurality of segments and the first sidewall of each of the second plurality of segments; and
a second cladding layer comprising a second dielectric material that has a second refractive index greater than the first refractive index, the second cladding layer adjoining the second sidewall of each of the first plurality of segments and the second sidewall of each of the second plurality of segments.