* Typical Lumileen plastic optical fiber (POF) consists of an inner plastic core with a thin cladding of fluorinated polymer.
* Since the refractive index of the outer cladding is lower than the core; light entering one end of a fiber reflects along the interior core material at the interface of the core and cladding.
* Light passes through the length of the fiber in a zigzag path on its way to the other end.