The 4 channel DWDM passive MUX and DEMUX modules deliver the benefits of a Dense Wave Division Multiplexer in a fully passive solution. With matching MUX/DEMUX units placed at each end of an optical link, up to 2 data channels can be combined and transmitted over a single-mode fiber trunk. The HT6000-ODU/OMU04 is ideal for increasing the fiber capacity between two sites without the need for installing or leasing additional fibers. The HT6000-ODU/OMU04 may be used as a standalone tabletop device or mounted in 1-unit space of a 19” data rack. It can achieve bi-directional 2 ch data multiplexing and demultiplexing. The complete passive solution requires no power cabling and no configuration; it is a true plug and plays solution.