US 11,733,449 B2
Ultra-low-loss coupled-core multicore optical fibers
Scott Robertson Bickham, Corning, NY (US); Dana Craig Bookbinder, Corning, NY (US); Ming-Jun Li, Horseheads, NY (US); Snigdharaj Kumar Mishra, Wilmington, NC (US); and Pushkar Tandon, Painted Post, NY (US)
Assigned to Corning Incorporated, Corning, NY (US)
Filed by CORNING INCORPORATED, Corning, NY (US)
Filed on Jul. 28, 2021, as Appl. No. 17/387,113.
Claims priority of provisional application 63/063,559, filed on Aug. 10, 2020.
Prior Publication US 2022/0043201 A1, Feb. 10, 2022
Int. Cl. G02B 6/02 (2006.01)
CPC G02B 6/02042 (2013.01) [G02B 6/02019 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A coupled-core multicore optical fiber comprising:
an outer common cladding comprising a relative refractive index ΔOCC relative to pure silica; and
a plurality of cores disposed in the outer common cladding, each of the plurality of cores comprising a relative refractive index ΔCi relative to pure silica and a maximum relative refractive index ΔCLi relative to pure silica;
wherein:
ΔCLi>ΔCi>ΔOCC;
each of the plurality of cores has an effective area at 1550 nm of greater than or equal to 120 micrometers2 (μm2) and less than or equal to 160 μm2; and
a coupling coefficient κ between adjacent cores of the plurality of cores is greater than or equal to 1×10−3/m and less than or equal to 5×10−3 /m.