What is the maximum loss for beam splitters 1-4

The maximum loss for typical beam splitters ranges from about 0.3 dB for low-loss PLC splitters to 20 dB for high-split or metallic-coated devices.Typical Loss ValuesPLC and FBT SplittersInsertion loss depends on the splitting ratio and number of output ports.For a 1:2 splitter, typical insertion loss is around 3.5 dB, while a 1:4 splitter may reach 7 dB or slightly higher due to splitting and excess loss .Modern low-loss PLC splitters can achieve as low as 0.3 dB per output for small splits .Dielectric or Thin-Film Beam SplittersLosses are generally lower than metallic-coated splitters.Dichroic coatings can make losses negligible, with total output power nearly equal to input .Metallic coatings typically introduce higher losses, sometimes several dB, depending on reflectivity and wavelength .Factors Affecting Maximum LossSplitting ratio: Higher splits (e.g., 1:8, 1:16) increase insertion loss.Coating type: Dielectric coatings minimize loss; metallic coatings increase it.Wavelength and angle of incidence: Loss varies with wavelength and beam angle .Excess loss: The difference between total input power and sum of output powers, typically 0.1–1 dB for quality splitters .Summary Estimates for Beam Splitters 1-4SplitterTypical Maximum Loss13–4 dB23–4 dB36–7 dB46–7 dBThese values assume standard 1:2 to 1:4 splitting ratios and high-quality dielectric or PLC splitters. For metallic-coated or high-split devices, losses can be significantly higher, up to 20 dB in extreme cases . In practice, always check the manufacturer's datasheet for the exact insertion and excess loss for each splitter, as these values can vary with wavelength, temperature, and optical power.