Design of tunable dispersion compensation device used in optical WDM network

In a wide area WDM network with a huge capacity, dispersion limits the scope of the network. Among new ideas of dispersion compensation, dispersion compensation fiber (DCF) is the best. However, DCF can not balance the dispersion of all channels because of dispersion slope. There is surplus dispersion in some channels, so that further compensation of the surplus dispersion is needed after the using of DCF. The FP resonator is a dispersion-tunable device. The surplus dispersions of all the channels can be compensated after the suing of FP resonator as a tunable receiver. The numerical results show that the radius of WDm network can be made three times as large as it would have been without this device.