The FOC-12N-111-9/125-SSS-1550-55-XXX-1-1 from OZ Optics Ltd. is a Fiber Optic Circulator with Insertion Loss 0.7 dB, Wavelength 1550 nm, Return Loss 55 dB, Optical Power 250 mW(Power Handling). More details for FOC-12N-111-9/125-SSS-1550-55-XXX-1-1 can be seen below.