A transmission-based polarization mode dispersion(PMD) compensator for multiple channels of dense wavelength division multiplexed(DWDM) system was proposed originally employing cascaded fiber Bragg gratings(FBG).This novel solution for PMD compensation is achieved by applying transverse and uniform distributed force on a uniform FBG.The compensated differential group delay(DGD) is tunable by changing the applied load at a fixed signal wavelength.It can compensate max 121 ps with a 5 cm long FBG at 100 N,and only 0.'2 ps DGD is introduced to the adjacent channel with 0.8 nm interval.