Experimental study of four-channel tunable optical add/drop multiplexer based on fibre Bragg gratings

Two types of four-channel tunable optical add-drop multiplexers(OADM) are demonstrated which are based on fiber Bragg gratings(FBGs),optical circulators and switches. Both of them can dynamically select the drop channel or just bypass all WDM channels. The crosstalk from the adjacent channel is lower than -23dB and the isolation between the drop and add port is higher than 40dB.OpticsTelecommunicationsEICPCI-S(ISTP)