| 摘要 |
A dispersion-shifted optical fiber (DS-fiber) is structured so that it has nearly zero chromatic dispersion in the 1.55 mu m wavelength band and, at the same time, achieves both reduced non linear effects and low dispersion slope. In particular, dispersion slope is reduced to a level sufficient for the fiber to be used for wavelength division multiplexing (WDM) applications. The properties of the fiber are developed such that chromatic dispersion in the 1.55 mu m band is nearly zero but not zero, effective cross section area is 45 DIFFERENCE 70 mu m2, bending loss is 0.1 DIFFERENCE 100 dB/m, dispersion slope is 0.05 DIFFERENCE 0.08 ps/km/nm2, and the cutoff wavelength is such that transmission is always single-mode transmission within the 1.55 mu m band. Such a DS-fiber has sufficiently large effective cross section area Aeff, low bending loss and small dispersion slope to make the fiber suitable for use in WDM transmission systems.
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