| 摘要 |
The present invention relates to an optical transmission line suitably used for a large-capacity high-speed WDM optical transmission system, and an optical fiber suitably used for such an optical transmission line. The optical transmission line is formed by connecting a single-mode optical fiber (SMF) and a dispersion compensating optical fiber (DCF). The dispersion compensating optical fiber has a dispersion value DDCF (unit: ps/nm/km) and dispersion slope SDCF (unit: ps/nm2/km) falling within the ranges of -82 <=DDCF<=-29 and 0.0023xDDCF<=SDCF<=0.033+0.0015xDDCF at a wavelength of 1,550 nm, respectively. At the wavelength of 1,550 nm, the transmission loss is 0.5 dB/km or less. Letting LDCF be the length of the dispersion compensating optical fiber, and LSMF be the length of the single-mode optical fiber, the value LDCF/(LDCF+LSMF) in the optical transmission line is 0.2 to 0.4. This optical transmission line can suppress the nonlinear optical phenomenon and is suitable to long-distance large-capacity transmission because the optical transmission line has a small transmission loss and low nonlinear index.
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