| 摘要 |
The present invention relates to an optical fiber having a large positive dispersion in a wavelength band of 1.55 mum in order to compensate for a negative dispersion inherent in an NZ-DSF in the wavelength band of 1.55 mum. This optical fiber comprises a depressed cladding structure constituted by a core region; an inner cladding, provided on the outer periphery of the core region, having a lower refractive index; and an outer cladding having a higher refractive index. In this optical fiber, the relative refractive index difference of the core region with respect to the outer cladding is 0.30% or more but 0.50% or less, and the relative refractive index difference of the inner cladding with respect to the outer cladding is -0.50% or more but -0.02% or less. Also, the optical fiber has a dispersion greater than 18 ps/nm/km at a wavelength of 1.55 mum, and an effective area of 70 mum<2 >or more at the wavelength of 1.55 mum.
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