The physical characteristics of dispersion & the resulting signal distortion have been studied extensively and different techniques for the dispersion compensation have been reported. There are several different methods that can be used to compensate for dispersion, including DCF, chirped Bragg gratings, all-pass optical filters and optical phase conjugation. These methods restore the signal such that it can be received in a normal receiver.
An alternative method is to detect the dispersed signal and perform the dispersion compensation electrically.
Fiber Bragg grating (FBG), which is widely used in wavelength filtering and smart sensing devices has become a very important technique for making tunable dispersion compensators. Ken-ichi Kitayama et al. in have investigated both theoretically and experimentally the dispersion effect of FBG used as the filter on DWDM millimeter-wave optical signal transmissions.