PON Split Ratio and Optical Loss Budget

Subtracts ideal and excess splitter loss, connectors, splices, and margin from a PON class budget, then converts the remainder to fiber reach at the worst operating wavelength. Every doubling of split ratio costs 3.01 dB: the worked 1:32 path reaches about 22.4 km, while 1:64 reaches 13.8 km. The applicable PON standard and component datasheets govern.

splitter loss = 10 log10(N) + excess; remaining fiber budget = class budget - splitter - connectors - splices - margin; reach = remaining/attenuation.

Logarithmic split loss and an entered PON optical-class budget. Class limits and component losses are not bundled.

A logarithm and additive dB budget.

Estimate. AHJ and licensed professional govern.

Field names used by the API: class_budget_db, split_ratio, splitter_excess_db, connector_count, connector_loss_db, splice_count, splice_loss_db, attenuation_db_km, design_margin_db, alternative_split_ratio, splitter_loss_db, remaining_fiber_budget_db, reach_km, alternative_reach_km, split_loss_delta_db

• Worst wavelength entered the path must close upstream and downstreamthe transceiver and cable data
• Uniform component losses splitter excess and connector/splice loss are enteredcomponent datasheets and acceptance limits
• Maximum-loss side only minimum path loss and receiver overload are not checkedthe applicable PON class