The CIR-3-13-L-1-343 from AFW Technologies is a Fiber Optic Circulator with Insertion Loss 0.8 dB, Isolation 45 dB, Operating Temperature -5 to 50 Degree C, Optical Power 300 mW, Polarization Dependent Loss 0.1 dB. More details for CIR-3-13-L-1-343 can be seen below.