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 compe nsation over 600 km of nondispersion shifted fiber at 10 Gb/s and show that a pair of 10 cm, 95% reflectivity gratings require apodization t o avoid pattern dependency, Approximately 70% apodization provides the best balance between restricted bandwidth and inexact dispersion comp ensation. Greater tolerance to apodization, bandwidth, and system leng th is achieved using gratings with approximate to 50% reflectivity. Th e effects of fiber nonlinearity are reduced by locating gratings at 20 0 and 400 km, this configuration also improves the tolerance to total system length and launched power.