Z-Light Coupler Insertion losses The following table lists the insertion losses observed at the outputs of a fiber coupler/splitter module Coupler Ratio Typical Insertion Loss 1X2 4.0 dBm 1X4 7.2 dBm 1X8 10.3 dBm 1X16 13.8 dBm 1X32 16.8 dBm