The short answer: A 1×2 splitter introduces ~3. A passive optical splitter divides an incoming light signal across two or more output ports. Enter the number of outputs and the excess loss from your splitter datasheet to see the total. Calculate insertion loss for passive optical splitters in PON and distribution networks. Excess loss accounts for manufacturing imperfections, typically 0. Two hundred homes were affected. Important Note! Mode Conditioning can be very important to testing couplers.