| 摘要 |
An optical fiber, including (i) an inner core having an alpha-power refractive index profile, (ii) an outer core having a refractive index of n1', and (iii) a cladding having a refractive index of n2 (n1'<n2<n1), is configured such that a depth of a trench, defined by n2-n1', is sufficiently increased. |
