The 1: FIC_COUPLER_ 1x4 from Diamond SA is a Fiber Optic Coupler with Wavelength 1310 - 1550 nm, Directivity 55 dB, Insertion Loss 7.8 dB, Return Loss 55 dB, Polarization Dependent Loss typical 0.25 dB. More details for 1: FIC_COUPLER_ 1x4 can be seen below.