6-port DWDM device is mainly used for passive wavelength division multiplexing modules for dual-fiber transmission. It is a TFF (thin film filter)-based wavelength division multiplexing technology. It has a variety of package sizes and wavelength options. DWDM has Channel spacing of 100GHz, 200GHz, etc.; a 6-port DWDM is equivalent to two 3-port products, suitable for long-distance, large-capacity long-distance backbone network, or ultra-large-capacity metropolitan area network core node, widely used in telecom 5G, metropolitan area network , Backbone network, data center and other fields.