Dispersion compensating fibers for non-zero dispersion fibers

We have for the first time to our knowledge demonstrated a single mode dispersion compensating fiber with low PMD, low loss and high Raman gain. The fiber can compensate the dispersion as well as the dispersion slope of the high slope NZDF with RDS of 0.018 nm/sup -1/. The importance of matching not only the dispersion and dispersion slope but also the dispersion curvature has been demonstrated with a new dispersion compensating fiber for low slope NZDF with RDS of 0.018 nm/sup -1/. The residual dispersion is measured to /spl plusmn/0.02 ps/(nm km) in a wide band from 1520 to 1580 nm facilitating 40 Gbit/s transmission for more than 3000 km with no individual channel dispersion correction.