| 摘要 |
A multi-core optical fiber (1) which has a plurality of core portions (111a to 117a) arranged separately from one another in a cross-section perpendicular to a longitudinal direction, and a cladding portion (12a) located around the core portions, the multi-core optical fiber comprises a cylindrical portion (1a) of which diameter is even, and a reverse-tapered portion (1b) gradually expanding toward at least one edge (1c) in the longitudinal direction, wherein a gap (D2) between each adjacent ones of the core portions in the reverse-tapered portion is greater than a gap (D1) between each adjacent ones of the core portions in the cylindrical portion. |
