The IU-10-A from AC Photonics is a Fiber Optic Isolator with Insertion Loss 2.8 dB to 4.2 dB, Isolation 44 dB, Operating Temperature -5 to 70 Degree C, Optical Power 300 mW, Polarization Dependent Loss 0.15 dB. More details for IU-10-A can be seen below.