Patent ID: 11828978

Abstract:
An MCF having a structure excellent in mass productivity and suppressing increases in splicing cost and loss are provided. The MCF includes 12 or 16 cores, a cladding, and a coating. The cores are arranged at positions of line symmetry while no adjacent relationship is established between the cores having an adjacent relationship with any core. A coating diameter is 235-265 μm, a cladding diameter CD is from CDnominal−1 μm to CDnominal+1 μm with a nominal value CDnominal of 195 μm or less, an MFD at 1310 nm is from MFD-reference-value −0.4 μm to the MCF-reference-value+0.4 μm with the MFD-reference-value of 8.2-9.2 μm, and a 22 m-cable-cutoff wavelength λcc is 1260-1360 nm. A core's zero-dispersion wavelength is a wavelength-reference-value −12 nm to the wavelength-reference-value+12 nm with the wavelength-reference-value of 1312-1340 nm, and a dispersion slope at the wavelength is 0.092 ps/(nm2·km) or less. A shortest distance from a cover-cladding interface to each core center, a structure, and optical characteristics satisfy predetermined conditions.