US 12,422,617 B2
Photonic integrated circuit including passive optical guard
Zhuojie Wu, Port Chester, NY (US); Yusheng Bian, Ballston Lake, NY (US); and Andreas D. Stricker, Essex Junction, VT (US)
Assigned to GlobalFoundries U.S. Inc., Malta, NY (US)
Filed by GlobalFoundries U.S. Inc., Malta, NY (US)
Filed on Jun. 16, 2022, as Appl. No. 17/807,257.
Prior Publication US 2023/0408763 A1, Dec. 21, 2023
Int. Cl. G02B 6/122 (2006.01); G02B 6/12 (2006.01); G02B 6/13 (2006.01)
CPC G02B 6/122 (2013.01) [G02B 6/13 (2013.01); G02B 2006/12126 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A photonic integrated circuit (PIC) structure, comprising:
a photonic component, wherein at least a portion of the photonic component is positioned in an active semiconductor layer of a semiconductor substrate;
a passive optical guard composed of a light absorbing material and in proximity to the photonic component, wherein the passive optical guard includes at least a portion positioned in the active semiconductor layer of the semiconductor substrate, and wherein the passive optical guard is entirely below a first metal layer and above a base semiconductor layer of the PIC structure; and
an insulator layer separating the photonic component and the passive optical guard.