Optical Power Budget Calculator

A fiber link only works if the signal that survives the trip from transmitter to receiver still lands within the receiver's usable power window — not too weak to detect, not so strong it saturates the detector. This calculator computes your available power budget as simply transmitter output power minus receiver sensitivity (both in dBm), then compares that against a required budget of your total link loss plus your chosen safety margin (3 dB is the industry-standard minimum, covering aging and future repairs). The difference is your remaining margin: zero or positive means the link is viable, negative means it will not reliably work as designed.

Received power is derived separately as transmitter power minus total link loss, and gets checked against the receiver's overload rating — if it's too strong, the calculator reports how much attenuation (in dB) you'd need to add to bring it safely below the overload threshold. One limitation worth knowing: the "Max Distance" output is a rough sanity-check estimate only, and it always assumes single-mode fiber at 1310nm (0.35 dB/km) with a fixed 4 connectors and 2 splices, regardless of what link-loss figure you entered above — it does not reflect multimode fiber, 1550nm wavelengths, or your link's actual splice/connector count. For an accurate loss figure tailored to your real link components, use the Fiber Optic Loss Budget calculator and feed its result into Total Link Loss here.