US 12,474,603 B2
Low-loss waveguiding structures, in particular modulators
Mian Zhang, Cambridge, MA (US); Christian Reimer, Wellesley, MA (US); and Kevin Luke, Cambridge, MA (US)
Assigned to HyperLight Corporation, Cambridge, MA (US)
Filed by HyperLight Corporation, Cambridge, MA (US)
Filed on Sep. 19, 2023, as Appl. No. 18/370,370.
Application 18/370,370 is a continuation of application No. 17/532,244, filed on Nov. 22, 2021, granted, now 11,815,750.
Application 17/532,244 is a continuation of application No. 16/924,767, filed on Jul. 9, 2020, granted, now 11,181,760, issued on Nov. 23, 2021.
Claims priority of provisional application 62/871,928, filed on Jul. 9, 2019.
Prior Publication US 2024/0004226 A1, Jan. 4, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G02F 1/035 (2006.01); G02B 6/122 (2006.01); G02F 1/225 (2006.01); G02B 6/28 (2006.01); G02F 1/01 (2006.01)
CPC G02F 1/035 (2013.01) [G02B 6/1228 (2013.01); G02F 1/225 (2013.01); G02B 6/2813 (2013.01); G02F 1/0118 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An optical modulator comprising:
a first active region supporting a first set of modes of an optical signal;
a first transitional region converting the first set of modes to a second set of modes of the optical signal, the second set of modes being different from the first set of modes;
a splitter, optically coupled with the first transitional region, configured to split the optical signal into a first sub-beam and a second sub-beam; and
a second waveguide arm coupled to the splitter for transmitting the second sub-beam;
wherein at least a portion of the first active region is configured to provide modulation of the optical signal, the first active region and the first transitional region including lithium.