The PFC-64-2-50-L-P-5-2-FB from AFW Technologies is a Fiber Optic Coupler with Wavelength 1064 nm, Optical Power 300 mW CW, Insertion Loss 0.25 dB, Return Loss 50 dB, Operating Temperature -5 to 70 Degree C. More details for PFC-64-2-50-L-P-5-2-FB can be seen below.