How thick is optical fiber?

Optical fiber is typically very thin, with a core diameter ranging from about 8 to 62.5 micrometers, depending on the type of fiber (single-mode or multi-mode). When including the protective cladding and outer jacket, the total diameter of the fiber can range from about 125 micrometers to several millimeters. This allows for high data transmission speeds over long distances while being lightweight and flexible.