FS.COM unique 1CH DWDM plug-in module is a passive optical add/drop multiplexer designed for metro access applications that represent the state of the art in fiber optics design. A dedicated wavelength can be dropped out of a fiber optic link that parallel transmits multiple DWDM wavelengths by using an add&drop multiplexer. All incoming wavelengths are received at one of the both line ports.
The required wavelength/application are dropped by the so-called ''drop'' client port. Thus, in the further course unused wavelengths can be connected with a new application by the so called ''add'' port.