The PISO-2-13-L-5-2-BB from AFW Technologies is a Fiber Optic Isolator with Optical Power 300 mW, Isolation 28 to 44 dB, Insertion Loss <0.6 to 0.7 dB, Wavelength 1310 nm, Return Loss 50 to 55 dB. More details for PISO-2-13-L-5-2-BB can be seen below.