The ODM Optical Add-Drop Multiplexer/Demultiplexer is a CWDM/DWDM multiplexer card. It can combine and split CWDM or DWDM channels, greatly save customers' optical fiber resources, and flexibly change network configuration according to customers' needs. The frequency interval of 100 GHz DWDM system supports smooth upgrade to 48 waves, and the frequency interval of 50 GHz DWDM system supports smooth upgrade to 96 waves. Higher spectrum utilization, saving bandwidth resources. Moreover, the CWDM system supports a smooth upgrade to 18 waves.