The PIFI-DS-P from Micro-Optics is a Fiber Optic Isolator with Insertion Loss 0.5 to 0.7 dB, Isolation 46 dB to 58 dB, Operating Temperature 0 to 70 Degree C, Optical Power 300 mW, Polarization Dependent Loss 0.05 dB. More details for PIFI-DS-P can be seen below.