A multiplexer (mux for short) device takes several input wavelengths from different sources and aggregates them into a single fiber. By doing so, it increases the amount of data transferred over the network, as multiple wavelengths are sharing the same fiber. A demultiplexer (demux for short) performs the opposite function: it takes a single fiber input with multiple wavelengths and disaggregates it into multiple fibers, each carrying a single wavelength. Mux/demux devices are passive and do not require any power. They play an important role in DWDM systems, as they increase efficiency, and reduce operating costs. PacketLight’s mux/demux solutions support 4/8/16/48/96 wavelength capacity, with different spacing between the wavelengths.