US 11,971,572 B2
Optical waveguide with stacked cladding material layers
Shesh Mani Pandey, Saratoga Springs, NY (US); Yusheng Bian, Ballston Lake, NY (US); and Francis O. Afzal, Cohoes, NY (US)
Assigned to GlobalFoundries U.S. Inc., Malta, NY (US)
Filed by GlobalFoundries U.S. Inc., Malta, NY (US)
Filed on Feb. 18, 2022, as Appl. No. 17/674,905.
Prior Publication US 2023/0266526 A1, Aug. 24, 2023
Int. Cl. G02B 6/036 (2006.01); G02B 6/028 (2006.01)
CPC G02B 6/0288 (2013.01) [G02B 6/036 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A structure comprising:
a waveguide core; and
a stack of cladding material layers positioned laterally adjacent to a sidewall of the waveguide core, wherein each of the cladding material layers in the stack abuts the sidewall, wherein at least two of the cladding material layers in the stack have different refractive indices, and
wherein the waveguide core has a bottommost surface substantially aligned with a bottommost surface of the stack of cladding material layers.