... , Fiber optic LAN Systems. CATEGORY: 3port/4port polarization insensitive optical circulator components for Telecom Circulator --- 3-Port Circulator, 1310/ ... Coupler (Both Axis Working) --- POLARIZATION MAINTAINING(PM) Tree Coupler Module (1x3,1×4,1×8) --- POLARIZATION MAINTAINING(PM) 3-Port ... --- CWDM, Single Device --- 4/8 ch CWDM Mux/Demux Module --- 980/1550 nm WDM, Filter Based --- 1310/1550 nm ...