The PFUI-13-15 from AC Photonics is a Fiber Optic Isolator with Insertion Loss 0.40 dB, Isolation 50 dB, Operating Temperature -20 to 70 Degree C, Storage Temperature -40 to 85 Degree C, Wavelength 1310nm, 1550 nm. More details for PFUI-13-15 can be seen below.