提出一种基于马赫-曾德尔干涉仪(MZI)和取样光纤布拉格光栅(SFBG)的新型光分插复用器(OADM),它由两个并联马赫-曾德尔干涉仪和四个取样光纤布拉格光栅组成。对该光分插复用器的输出特性进行了理论仿真,研究得出通道间隔为0.8nm时下载和输出端口的光谱特性,研究发现干涉仪的臂长差和取样光栅的中心波长差是决定光分插复用器输出特性的主要因素。调节一个马赫-曾德尔干涉仪上的臂长差和取样光栅的中心波长,可以实现信号下载可调功能或直通功能。 A new optical add / drop multiplexer (OADM) based on Mach-Zehnder interferometer (MZI) and sampled fiber Bragg grating (SFBG) is proposed. It consists of two parallel Mach-Zehnder interferometers and four sampling fiber Bragg Grating composition. The output characteristics of the optical add / drop multiplexer are theoretically simulated. The spectral characteristics of the download port and the output port are obtained when the channel spacing is 0.8 nm. It is found that the difference between the arm length of the interferometer and the center wavelength of the sampling grating is the decision Optical add / drop multiplexer output characteristics of the main factors. Adjusting the arm length difference on a Mach-Zehnder interferometer and sampling the center wavelength of the grating allows for signal download tunable or pass-through functions.