The F4M-CIRI from Fiberon Technologies Inc is a Fiber Optic Circulator with Insertion Loss 0.7 to 0.9 dB, Wavelength 1310 nm, 1550 nm, 1064 nm, Isolation 38 to 45 dB, Return Loss 50 to 55 dB, Optical Power 300 mW. More details for F4M-CIRI can be seen below.
