US 12,449,588 B2
Multicore fiber stubs, multicore fan-in, fan-out devices, and methods of fabricating the same
Ming-Jun Li, Horseheads, NY (US); and Qi Wu, Painted Post, NY (US)
Assigned to CORNING RESEARCH & DEVELOPMENT CORPORATION, Corning, NY (US)
Filed by Corning Research & Development Corporation, Corning, NY (US)
Filed on Oct. 26, 2022, as Appl. No. 17/974,080.
Claims priority of provisional application 63/273,413, filed on Oct. 29, 2021.
Prior Publication US 2023/0138454 A1, May 4, 2023
Int. Cl. G02B 6/02 (2006.01); G02B 6/26 (2006.01)
CPC G02B 6/02042 (2013.01) [G02B 6/262 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A multicore optical fiber stub comprising:
a plurality of optical cores, each optical core having an inner core and an outer core;
a fiber coupling section having a first diameter, wherein the plurality of optical cores has a first pitch at the fiber coupling section, and each core at the fiber coupling section has a first index profile with three regions comprising different indexes of refraction;
a multicore fiber coupling section having a second diameter that is less than the first diameter, wherein the plurality of optical cores has a second pitch at the multicore fiber coupling section that is less than the first pitch, and each core at the multicore fiber coupling section has a second index profile with three regions comprising different indexes of refraction; and
a taper section between the fiber coupling section and the multicore fiber coupling section, the taper section having a decreasing diameter such that the taper section has a taper ratio of the first pitch to the second pitch being less than 4, and wherein the taper section provides an adiabatic taper for the plurality of optical cores.