The PSI & PDI Series from Advanced Fiber Resources (Zhuhai) Ltd. is a Fiber Optic Isolator with Optical Power 300 mW, Isolation 32 to 45 dB, Insertion Loss 1.5 to 3.6 dB, Wavelength 1064 nm, Polarization Dependent Loss 20 dB. More details for PSI & PDI Series can be seen below.