| 摘要 |
An optical fiber for use in a metro network is provided. The optical fiber has a loss of 0.25 dB/km or less in the C-band and the L-band, a zero dispersion wavelength between 1560 nm and 1560 nm, and a dispersion slope of at least 0.074 ps/nm<2>/km at a wavelength of 1550 nm. <??>The optical fiber has a core including a central region and a refractive index-depressed region, the central region having a first refractive index N1, the refracting index-depressed region having a second refractive index N2 and surrounding the central region, the first refractive index N1 having a maximum refractive index of the optical fiber and the second refractive index N2 having a minimum refractive index of the optical fiber; and a clad including an inner clad portion and an outer clad portion, the inner clad portion having a third refractive index N3 and surrounding the refractive index-depressed region, the outer clad portion having a fourth refractive index N4 and surrounding the inner clad portion, the third refractive index N3 being equal to or larger than the second refractive index N2. <??>The first to fourth refractive indices of the optical fiber have relations, 0.34%≤(N1-N4)N4≤0.55% and -0.005%≥(N2-N4)/N4≥-0.01%. <IMAGE>
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