The PSDI-A-Grade from HJ Optronics, Inc. is a Fiber Optic Isolator with Insertion Loss 0.9 to 1 dB, Isolation 38 dB, Operating Temperature -5 to 70 Degree C, Optical Power 300 mW, Polarization Dependent Loss 0.2 dB. More details for PSDI-A-Grade can be seen below.