Optical Add/Drop Multiplexer (OADM) is one of the key compo nents for WDM system.Device based on fiber grating is a promising candidate for OADM.In this paper,a novel optical Add/Drop multiplexer using two circulato rs,one isolator and two fiber gratings is proposed.The experiments to evaluate t he performances of the novel device compared to the ordinary one have been condu cted.The experiment results turn out that the signals produce no crosstalk on th e signals on DROP port.Meanwhile,the signals on DROP port produce no crosstalk o n the signals on ADD port either.Therefore,in the novel device,the interferometr ic crosstalk between the ADD and DROP ports is suppressed completely.One more ad vantage of the device is that the peak reflectivity is not crucial in this novel structure.