	US 12,072,529 B2
	Optical waveguides and methods for producing
Venkatesh Botu, Corning, NY (US); Ming-Jun Li, Horseheads, NY (US); and William James Miller, Horseheads, NY (US)
Assigned to CORNING INCORPORATED, Corning, NY (US)
Appl. No. 17/779,395
Filed by CORNING INCORPORATED, Corning, NY (US)
PCT Filed Nov. 20, 2020, PCT No. PCT/US2020/061414 § 371(c)(1), (2) Date May 24, 2022, PCT Pub. No. WO2021/108235, PCT Pub. Date Jun. 3, 2021.
Prior Publication US 2022/0413220 A1, Dec. 29, 2022
Int. Cl. G02B 6/136 (2006.01); C03C 17/02 (2006.01); G02B 6/122 (2006.01); G02B 6/12 (2006.01)

CPC G02B 6/136 (2013.01) [C03C 17/02 (2013.01); G02B 6/1223 (2013.01); G02B 2006/12038 (2013.01)]

20 Claims

1. A process for forming glass planar waveguide structure, the process comprising:

producing or otherwise obtaining a fusion drawn glass laminate comprising a core glass layer and a first clad glass layer and a second clad glass layer;

removing or thinning portions of the second clad glass layer leaving remaining or thicker portions of the second clad glass layer arranged in a first planar waveguide pattern; and

etching V-grooves in alignment with one or more of the remaining or thicker portions of the second clad glass layer.