The ISOS-64-L-1-6 from AFW Technologies is a Fiber Optic Isolator with Optical Power 300 mW, Isolation 28 to 44 dB, Insertion Loss 1.6 to 3.4 dB, Wavelength 1064 nm, Polarization Dependent Loss 0.15 dB. More details for ISOS-64-L-1-6 can be seen below.