... systems. CATEGORY: 1310nm&1550nm 3port polarization maintaining optical circulator(POLARIZATION MAINTAINING(PM)CIR),single stage, fast axis ... nm POLARIZATION MAINTAINING(PM) Isolator Circulator --- 1550nm 3-Port Circulator --- 1550nm 4-Port Circulator --- 1550 nm 3-Port POLARIZATION ... Pump Protector, Singlemode Fiber --- 1550 nm Bandpass Filter, 2 nm Passband In-Line Polarizer/PBS --- 1550nm In-Line ...