The JDSU CWDM add/drop modules, based on thin-film filter (TFF) technology, provide extremely high performance. With low insertion loss, low polarization sensitivity, and high temperature stability, these modules are well suited to CWDM network applications. The modules add and drop 1, 2, or 4 CWDM channels from network traffic, bypassing the other channels. These fixed add/drop modules offer low-cost wavelength management solutions. In addition, they are easily customizable, and can be configured based on customer-specific channel plan, packaging type, and connector type.