US 12,032,211 B1
Large mode coupler
Christian Reimer, Wellesley, MA (US); Mian Zhang, Cambridge, MA (US); Kevin Luke, Cambridge, MA (US); and Prashanta Kharel, Cambridge, MA (US)
Assigned to HyperLight Corporation, Cambridge, MA (US)
Filed by HyperLight Corporation, Cambridge, MA (US)
Filed on Oct. 15, 2021, as Appl. No. 17/503,078.
Claims priority of provisional application 63/093,681, filed on Oct. 19, 2020.
Int. Cl. G02B 6/30 (2006.01)
CPC G02B 6/305 (2013.01) 20 Claims
OG exemplary drawing
 
1. An optical device configured to be coupled with an optical fiber, comprising:
a waveguide including a high-confinement waveguide, the high-confinement waveguide having a first index of refraction and including lithium;
a low-confinement waveguide optically coupled with the high-confinement waveguide, at least a portion of the low-confinement waveguide having a second index of refraction less than the first index of refraction, the low-confinement waveguide having a thickness of at least a mode diameter in a portion of the optical fiber, the low-confinement waveguide having an outer surface, the high-confinement waveguide being external to the outer surface of the low-confinement waveguide, a portion of the waveguide being on the low-confinement waveguide; and
a low-confinement layer adjacent to a portion of the low-confinement waveguide, the low-confinement layer having a third index of refraction less than the second index of refraction.