Numerical study of 10-cm chirped-fiber grating pairs for dispersion compensation at 10 Gb/s over 600 km of nondispersion shifted fiber

We examine illustrative cases for fiber-grating-based dispersion compensation over 600 km of nondispersion shifted fiber at 10 Gb/s and show that a pair of 10 cm, 95% reflectivity gratings require apodization to avoid pattern dependency. Approximately 70% apodization provides the best balance between restricted bandwidth and inexact dispersion compensation. Greater tolerance to apodization, bandwidth, and system length is achieved using gratings with /spl ap/50% reflectivity. The effects of fiber nonlinearity are reduced by locating gratings at 200 and 400 km, this configuration also improves the tolerance to total system length and launched power.