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US 11,815,713 B2Granted
Multicore fiber with exterior cladding region
AssigneeCorning Incorporated
InventorsMing-Jun Li, Gaozhu Peng
Life of this patent
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Abstract
A multicore optical fiber includes two or more cores, a common interior cladding surrounding the two or more cores, and a common exterior cladding surrounding the common interior cladding. The common exterior cladding has a lower relative refractive index than the common interior cladding and reduces tunneling losses from the cores. The reduced tunneling loss allows placement of cores closer to the edge of the fiber, thus providing multicore optical fibers having higher core count for a given fiber diameter. Separation between cores is controlled to minimize crosstalk.
Claims22
A multicore optical fiber comprising:
- a multicore glass fiber, the multicore glass fiber comprising:
- a plurality of core regions, each of the plurality of core regions surrounded by and directly adjacent to a dedicated inner cladding region, the dedicated inner cladding region having a radius r2 in the range from 9.0 μm-18.0 μm and a relative refractive index Δ2 in the range from −0.80% to −0.10%;
- a common interior cladding region surrounding the dedicated inner cladding region of each of the plurality of core regions, the common interior cladding region having a relative refractive index Δ4 and a radius R4;
- and
- a common exterior cladding region surrounding the common interior cladding region, the common exterior cladding region having a radius R5>R4 and a relative refractive index Δ5<Δ4, the radius R5 less than 65.0 μm.
2 more elements
Dependencies are inferred from the claim text.