| 摘要 |
This optical fiber is provided with a core and a clad surrounding the outer circumference of the core, has a refractive index profile expressed by a specific refractive index difference Δ(r) with respect to the distance r from the center of the core, and has an A value of 0.3%・µm or less, the A value being expressed by the following equation (where r is in µm units, the specific refractive index difference Δ(r) is in % units, Δref(r)=-0.064r+0.494, and MFD1.31 is a mode field diameter at a wavelength of 1.31 µm). |
