For example, for the loss (attenuation) in a segment of optical fiber we have the value at the input of the segment and at its output. If we have measured gains in linear units (e. in Watts – W), the loss value in dB is calculated by the formula: Loss (dB) = 10 lg ( mW1 / . Optical splitters are common in building distribution networks, especially where one feeder must serve many rooms, floors, or tenants. A splitter does not “create” power; it divides available optical energy among outputs, so every branch must be checked for adequate loss budget. This calculator. Instantly compute insertion loss, power at each subscriber port, and fade margin for PLC and FBT splitters — including dual cascade configurations. Covers GPON (1490 nm / 1310 nm), EPON, and RF video overlay (1550 nm). Also useful as an optical power budget calculator, FTTH link budget tool, and. Estimate whether an FTTH or PON optical link is feasible by calculating PLC splitter loss, fiber attenuation, connector loss, splice loss and remaining power margin between the OLT and ONU/ONT.
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