The ISU-1550-FCAPC from MKS | Newport is a Fiber Optic Isolator with Insertion Loss 0.7 dB, Isolation 60 dB, Operating Temperature 0 to 70 Degree C, Optical Power 300 mW, Polarization Dependent Loss 0.1 dB. More details for ISU-1550-FCAPC can be seen below.