| 摘要 |
The present invention provides an optical fiber of which a zero dispersion wavelength falls within a range of between 1,250 nm and 1,350 nm inclusive, transmission loss at 1,550 nm is equal to or less than 0.185 dB/km, chromatic dispersion at 1,550 nm is within the range of 19±1 ps/nm.km, a dispersion slope at 1,550 nm is equal to or less than 0.06 ps/nm<SUP>2</SUP>.km, an effective area A<SUB>eff </SUB>is equal to or more than 105 mum<SUP>2</SUP>, a cable cutoff wavelength lambda<SUB>cc </SUB>is equal to or less than 1,530 nm, polarization mode dispersion is equal to or less than 0.1 ps/km<SUP>1/2</SUP>, and a loss when the optical fiber is wound on a mandrel having an outer diameter of 20 mm is equal to or less than 10 dB/m.
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