The HPBI-1050-1053-H6 from OF-Link Communications is a Fiber Optic Isolator with Insertion Loss 1 to 1.5 dB, Isolation 26 dB, Operating Temperature -5 to 50 Degree C, Optical Power 1, 3, 5, 10, 15, 20 W, Polarization Dependent Loss 0.15 dB. More details for HPBI-1050-1053-H6 can be seen below.