| 摘要 |
<p>An optical fiber comprises a core region, an inner cladding region, and an outer cladding region. The core region, the inner cladding region, and the outer cladding region extend along the fiber axis. A relation of n1<n2<n0 is satisfied, where n0 is the average refractive index of the core region, n1 is the average refractive index of the inner cladding region, and n2 is the average refractive index of the outer cladding region. Three or more regions consisting of a secondary medium with a refractive index different from that of the primary medium that forms the inner cladding region extend along the fiber axis in the inner cladding region.</p> |
