Even if you have a solid understanding of fiber optic cables, including how they are used and installed, you may have a big question on your mind: How are these cables made?

An optic cable contains one or more fiber, based on its use, the manufacturer, and its quality. A fiber optic cable typically consists of the following:

  • Core
  • Cladding
  • Kevlar
  • Ferrule
  • Polishing

To better understand how a fiber optic cable is made, you first need to learn more about each of these parts:

  • Core: this is the center part of the cable that’s responsible for light transmission. It consists of a continuous strand of glass.
  • Fiber and cladding: the fiber is made up of a core, which is surrounded by cladding. The job of the cladding is to reflect light back into the core. 
  • Kevlar: while many people refer to it as Kevlar, the registered trademark name, it’s nothing more than the “yellow hair” or synthetic fiber that is used as the protective outer layer. With extreme strength, this layer is able to protect the cable from all types of damage. 
  • Ferrule: this is the part of an optic cable that protrudes from the end of a fiber connector. It’s typically made of stainless steel, plastic, or ceramic. Not only is this the most expensive part of a fiber optic cable, but it’s also the most important. Precision and accuracy is critical, as the ferrule is primarily responsible for establishing a good connection. The fiber at the end of this piece is polished to ensure the proper transfer of signal.

With this knowledge, you’ll never again look at a fiber optic cable and wonder what it’s made of.