Which type of fiber optic cable is designed to cover long distances and has a diameter of 8.3 - 10µ?

Single Mode Fiber is specifically designed for long-distance communication. It has a small core diameter typically around 8.3 to 10 micrometers, which allows it to transmit light directly down the fiber with minimal dispersion. This characteristic enables single mode fiber to support higher bandwidths and longer distances compared to multimode fiber, which has a larger core diameter and is more susceptible to modal dispersion.

Because of its design, single mode fiber is ideal for applications that require communication over several kilometers, such as in telecommunication networks and long-haul data links. The narrow core of single mode fiber ensures that the light travels in a single mode, significantly reducing signal degradation over long distances. This makes it the preferred choice for backbone infrastructure in enterprise networks and for connecting different locations within a city or across countries.