This is a 1 channel 1550nm LC/UPC optical circulator, all within a single 1U 19inch package. This OADM supports wavelengths between 1260nm and 1620nm, and can be customized among a variety of CWDM channels. This circulator is a nonreciprocal passive component that transmits light in only one direction. The WDM circulator supports a 1550nm wavelength. Circulators are used to increase transmission capacity of existing networks by converting bi-directional signals through a single fiber. This allows the transmission capacity of the network to be doubled without the need for deploying additional fibers, which has become increasingly expensive. They exhibit high isolation and low insertion loss. Circulators can be used alongside of mux/demux devices, optical add/drop, and other applications. All of our mux/demux products are 100% compliant and provide a cost effective solution for your network upgrade needs. With our certification test program, we guarantee your product will work correctly the first time.