DWDM (Dense Wavelength Division Multiplexing) solution is the preferred option for long-haul transmission. The common used DWDM wavelengths include 48 wavelengths in ITU 100GHz grid (spacing 0.8nm) and 96 wavelengths in ITU 50GHz grid (spacing 0.4nm). It is used to increase the bandwidth of the existing optical backbone network. In DWDM system, MUX/Demux are two indispensable modules. MUX (multiplexer) is the module at the transmitting end, which aggregates multiple data signals to be transmitted through a single optical fiber, and Demux (multiplexer) is a module at the receiving end. It separates the signals gathered together and passes each channel to a fiber receiver. AscentOptics provides a wide series of DWDM Mux/Demux modules support 8 channels up to 96 Channels, with single fiber or dual fiber options. Packaged in LGX box or 1U/2U rack depending on different specifications.