Fiber optic patch cords are used as devices to the jumper fiber optic cabling links. It has a thick layer of protection, generally used in the connection between the Optical and the terminal box.

Fiber jumper means are fitted at both ends of the cable connector plug, used to achieve optical active connection, plug one end fitted is called pigtails. Fiber jumpers (Optical Fiber Patch Cord/Cable) and coaxial cable are similar, but not mesh shield. The center is the glass core of light propagation. In a multimode fiber, the core diameter is 50μm ~ 65μm, roughly the thickness of a human hair fairly. The single-mode fiber core diameter of 8μm ~ 10μm. Outside core surrounded by a layer of lower refractive index than the core of the glass envelope, so that the light kept within the core. Then the outside is a thin plastic jacket to protect the envelope.