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提出了一种结构新颖的基于Mach-Zehnder干涉仪和光纤光栅的光分插复用器。它由Mach-Zehnder干涉仪、2个环形器和3个光纤光栅构成,2个环形器之间的光纤光栅起波长选择开关作用,调节光纤光栅的中心波长,可以实现光信号的上下载或直通功能,光信号上下载时通道的最大隔离度大于23 d B,同频串扰低于-40 d B,该系统不仅可以实现针对特定波长的上下载,还可以实现对上下载波长的可调谐。基于Mach-Zehnder干涉仪和光纤光栅的新型结构光分插复用器具有结构简单、成本低、灵活性强等特点,在光纤通信波分复用系统中具有良好的实际应用价值。
A novel optical add / drop multiplexer based on Mach-Zehnder interferometer and fiber grating is proposed. It consists of a Mach-Zehnder interferometer, two circulators and three fiber gratings. The fiber grating between the two circulators acts as a wavelength selective switch to adjust the center wavelength of the fiber gratings so that the optical signal can be downloaded or transmitted directly Function, the maximum isolation of the channel is greater than 23 d B when the optical signal is downloaded, and the crosstalk with the frequency is lower than -40 d B. The system not only can realize the uploading and downloading to a specific wavelength, but also can tune the up-and-down wavelength. The new structure optical add-drop multiplexer based on Mach-Zehnder interferometer and fiber grating has the advantages of simple structure, low cost and strong flexibility, and has good practical application value in the optical fiber WDM system.