The 2x2 1310/1550nm PM Optical Circulator from Shanghai Fsphotonics Technology is a Fiber Optic Circulator with Insertion Loss 0.7 to 1.1 dB, Wavelength 1310 nm, 1550 nm, Isolation 20 to 50 dB, Return Loss 55 dB, Optical Power 500 mW. More details for 2x2 1310/1550nm PM Optical Circulator can be seen below.