The S-85-1-2 from AC Photonics is a Fiber Optic Isolator with Insertion Loss 1 dB to 1.2 dB, Isolation 20 dB, Operating Temperature 0 to 60 Degree C, Optical Power 300 mW, Polarization Dependent Loss 0.2 dB. More details for S-85-1-2 can be seen below.