The F4M-TMISO from Fiberon Technologies Inc is a Fiber Optic Isolator with Optical Power 300 mW, Isolation 38 to 40 dB, Insertion Loss 0.6 to 1 dB, Wavelength 1550 nm, Polarization Dependent Loss 0.1 to 0.2 dB. More details for F4M-TMISO can be seen below.
