The IS-85 from AC Photonics is a Fiber Optic Isolator with Insertion Loss 1.2 dB to 1.5 dB, Isolation 20 dB (@±20 nm) 18 dB (@±30 nm), Operating Temperature 0 to 60 Degree C, Optical Power 600 mW, Polarization Dependent Loss 0.2 dB (Typ. 0.1). More details for IS-85 can be seen below.