🔦 OTDR Fibre Trace: Pulse Width, Resolution, Splice Loss and Dynamic Range (2D)

Side view of an optical time-domain reflectometer sending a pulse down a fibre with a splice, a connector and an open end, and building the backscatter trace from the returning light. Set fibre length, attenuation, pulse width, number of averaged sweeps, splice loss and position, and see how resolution, noise floor and reach trade against each other. Backscatter, Fresnel reflection and noise are computed, with five in-page numerical checks. A fibre-optics companion to the 3D OTDR fault twin.