As light travels through a fiber optic cable, amplitude measures how far each wave moves from its resting point. When the cable bends tightly, some light escapes through the walls instead of bouncing forward — and that loss shows up directly as a drop in amplitude. You wrap the cable around wooden dowels ranging from 1 inch to 1/8 inch in diameter and record the amplitude at each bend using a scopemeter. Tighter bends produce greater amplitude loss. Frequency stays constant throughout, confirming that the bends affect wave height, not wave rate.

A signal can also weaken from the path itself, not just an outside obstacle. Light travels through fiber optic cables by bouncing off the inner walls, but a tight bend lets some of that light escape. You wrap the cable around wooden dowels ranging from 1 inch to 1/8 inch in diameter, then record amplitude at each bend using a scopemeter. Tighter bends cause greater amplitude loss. The frequency stays the same — only the signal strength drops, and signals sent at a lower amplitude lose a higher percentage than those sent at a higher one.

Fiber optic cables send light from one place to far away by bouncing it off the inner walls of thin glass or plastic threads. A tight bend can cause some of that light to escape, weakening the signal. To measure how much, you wrap a cable around wooden dowels ranging from 1 inch to 1/8 inch in diameter and record the amplitude for each bend using a scopemeter. Tighter bends cause greater amplitude loss. Frequency stays the same throughout — meaning the bends reduce signal strength but do not alter the signal itself.