The PMIS-D-4-5-7-A from COMCORE Technologies is a Fiber Optic Isolator with Insertion Loss 0.7 dB to 0.9 dB, Isolation 45 dB, Operating Temperature -5 to 70 Degree C, Optical Power 300 mW, Return Loss 55/50 dB. More details for PMIS-D-4-5-7-A can be seen below.