a Tunable Dispersion Compensation(TDC) scheme for 40 Gbit/s WDM systems is introduced.In this scheme
high-accuracy dispersion compensation can be made for the existing 40 Gbit/s WDM system with the principal modulation and encoding formats by using the CFBG-based multi-channel dispersion compensation technology and the EDFA-based automatic power control technology.At the same time