| 摘要 |
PROBLEM TO BE SOLVED: To provide a dispersion compensating optical fiber capable of compensating the wavelength dispersion of a single mode optical fiber for transmission over a wide wavelength-band. SOLUTION: A core 4 consists of a center core part 1 having a refractive index higher than that of a clad 5, an intermediate core part 2 having a refractive index lower than that of the clad 5, and a ring core part 3 having a refractive index higher than that of the clad 5. In a wavelength 1.55μm, negative wavelength dispersion is provided, a negative wavelength dispersion slope is provided, an effective core cross-sectional area is >=18μm2, a bending loss is <=50 dB, single mode propagation is substantially possible and the wavelength dispersion of a transmission line combined with the single mode optical fiber for transmission having positive wavelength dispersion is <=-0.5 to +0.5 ps/nm/ km in a continuous using wavelength band of a range of >=0.06μm wavelength width selected from the range of a wave length 1.45μm to 1.63μm, in the distribution compensating optical fiber.
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