The 1x3 Single Mode Wide Band Single Window Coupler (SWBC) from Intepon is a Fiber Optic Coupler with Insertion Loss <6 dB, Bandwidth ±40 nm, Wavelength 1310 nm, 1550 nm, Directivity >55 dB, Return Loss >55 dB. More details for 1x3 Single Mode Wide Band Single Window Coupler (SWBC) can be seen below.