| 摘要 |
The invention provides an optical fiber suitable for an optical transmission line for controlling the dispersion of a total line such that this dispersion is approximately zero by combining plural optical fibers. As one example, in the optical fiber having a refractive index profile structure of four layers, a relative refractive index difference DELTA1 of a center core with respect to a clad is set to 0.75% or more and 0.90% or less, and dispersion at a wavelength of 1.55 mum is set to -18 ps/nm/km or more and -8 ps/nm/km or less, and an effective core section area Aeff at the wavelength of 1.55 mum is set to 32 mum2 or more.
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