Optical add-drop multiplexer (OADM) for adding and dropping wavelength groups

摘要

The OADM includes a wavelength groups (DMUX 210, MUX 220), a channel selector (215) and a channel multiplexer (225). DMUX 210 demultiplexes several input channels into wavelength groups, drops one of wavelength groups allowing the other to pass through. Selector 215 selects each channel from the dropped group which is transmitted to the area covered by the channels. Multiplexer 225 multiplexes optical signals input from the covered areas of wavelengths which are the same as those of the dropped channels. MUX 220 adds the wavelength group multiplexed in the channel multiplexer to the wavelength groups having passed through the wavelength group DMUX 210. An Independent claim is included for a WDM optical link.