Fiber optic connectors, also known as terminations, connect two ends of fiber optic cables. The optical fiber elements are typically individually coated with plastic layers and contained in a protective tube. Where copper twisted pairs tend to terminate with an RJ45 plug, fiber optic connectors come in all sorts of shapes and sizes, with all manner of different use cases in mind. The fiber. Fiber optic "cable" refers to the complete assembly of fibers, other internal parts like buffer tubes, ripcords, stiffeners, strength members all included inside an outer protective covering called the jacket. Once a beam reaches the end, it is dispersed at an approximately 60° angle and emitted to the target.