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|1. (WO2017033584) MULTICORE FIBER AND OPTICAL CABLE|
NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY
|Title:||MULTICORE FIBER AND OPTICAL CABLE|
This multicore fiber is provided with: at least three cores that allow single-mode transmission; a common cladding that covers the periphery of the at least three cores; and a low-refractive-index portion having a lower refractive index than the cladding. The multicore fiber has a region where the at least three cores are annularly arranged on the cross-section orthogonal to the longitudinal direction. At least a part of the low-refractive-index portion is arranged inside the minimum inscribed circle between the adjacent two cores in the region.