The OC-3-1310-HP from Qbiclaser is a Fiber Optic Circulator with Insertion Loss 0.9 to 1.3 dB, Wavelength 1310 nm, Isolation >33 to 35 dB, Return Loss <58 dB, Optical Power 500 mW to 5 W(Power Handling). More details for OC-3-1310-HP can be seen below.