Patent attributes
A single-mode optical fiber has a prescribed mode field diameter (MFD1 (μm)) at a first wavelength λ1, in which a bending loss when measured at a second wavelength λ2 (μm) and wound with a bending radius r (mm) is Lb (dB) for one bending, a connector/splice loss with an optical fiber that has a prescribed mode field diameter MFD2 (μm) at the first wavelength λ1 is Ls (dB) for one connection/splice point at the second wavelength λ2 (μm), and an mode field diameter dependence of a total loss coefficient calculated by a formula (1) has a local minimal value in a range of MFD1±0.5 μm, with the formula (1) being as follows:L=ws·Ls+wb·Lb, (1)ws+wb=1, (2)ws>0, wb>0 (3)where ws and wb in the formula (1) represent dimensionless weighting factors and are set within a range that satisfies the formulas (2) and (3).
