Optical cable length limits depend on the interface and fiber type: keep consumer TOSLINK/SPDIF under about 15 m for reliable audio. Some cables reach ~30 m but risk dropouts. Treat ADAT/Lightpipe conservatively unless your gear specifies longer spans. Use multimode fiber for short-to-medium runs. In this blog, I will discuss the fiber optic cable distance, the effect factors, how to choose the right fiber optic cables, and how to compare the transmission distances of single-mode and multimode fiber optic cables. Attenuation is the progressive loss of signal strength that occurs as light travels through the fiber. This guide dives deep into the maximum length constraints of the three most common network cables—Ethernet, coaxial, and fiber optic—explaining why these limits exist, how they vary. EDFAs are typically spaced every 50 to 100 kilometers in submarine cable systems, operating in the 1550 nanometer low-loss window to compensate for power loss. For this, systems use 3R (Re-amplify, Reshape.