Multi-core fiber optic, multi-core fiber optic cable and fiber optic transmission system

摘要

The present embodiment relates to an MCF in which the strength of mode coupling or power coupling between adjacent cores included in one coupled-core group is set to an appropriate level to reduce a DGD. The MCF includes at least one coupled-core group. A core interval › between adjacent cores included in the coupled-core group is set such that a mode coupling coefficient between the adjacent cores at a wavelength of 1550 nm is 2.6 × 10 0 [m -1 ] to 1.6 × 10 2 [m -1 ] or a power coupling coefficient between the adjacent cores at the wavelength of 1550 nm is 1.3 × 10 -3 [m -1 ] to 8.1 × 10° [m -1 ].