Let's say you have a laser output at 0 dBm (which is 1 milliwatt of optical power). If you use a 1×8 splitter with ~10. 5 dBmCalculate R/T power splitting, Fresnel reflectance, and plate beam displacement. Abridged Optics — Beam Splitter Calculatorv1. See power budget impact instantly, then download a CSV or PDF summary. Common values: 2, 4, 8, 16, 32, 64. Connector loss is always measured as a mated pair. These values are approximate and should not be. Thorlabs' Single Mode 1x8 Fiber Optic Planar Lightwave Circuit (PLC) Splitters allow a user to split a single input signal evenly into eight output signals, which is ideal for passive optical networks (PON) and other high-channel-count applications. In contrast to fused fiber couplers, where light.