Abstract: Two types of four-channel tunable optical add-drop multiplexers are demonstrated which are based on fiber Bragg gratings, 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 $MIN@23 dB and the isolation between the drop and add port is higher than 40dB. !8
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机译：摘要：展示了两种基于光纤布拉格光栅，光环行器和开关的四通道可调光分插复用器。两者都可以动态选择放置通道或仅绕过所有WDM通道。来自相邻通道的串扰低于$ MIN @ 23 dB，并且分插端口与增加端口之间的隔离度高于40dB。 ！8
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