The R2500-S from OEQuest is a Fiber Optic Circulator with Insertion Loss 0.6 to 0.8 dB, Wavelength 1530 to 1565 nm (C to band), Isolation 40 to 50 dB, Return Loss 50 dB, Optical Power 300 mW(Power Handling). More details for R2500-S can be seen below.
