A novel optical add-drop multiplexer (OADM) based on
the Mach-Zelauler interferometer (MZI) and the fiber Bragg grating
(FBG) is proposed for the first tittle to the authors ' knowledge. In the
structure, the Mach-Zehnder interferometer acts as an optical switch.
The principle of the OADM is analyzed in this paper. The OADM can
add/drop one of the multi-input channels or pass the channel directly by
adjusting the difference of the two arms of the interferometer. The channel
isolation is more than 20 dB