The Single Mode Wide Band Single Window Coupler (SWBC) from Anylink Technology is a Fiber Optic Coupler with Insertion Loss 6.9 dB, Bandwidth ±40 nm, Wavelength 1310 nm, 1550 nm, Directivity >55 dB, Return Loss >55 dB. More details for Single Mode Wide Band Single Window Coupler (SWBC) can be seen below.