Light advance down a Fiber Optic Splice Closure by bouncing afresh off the walls. Ceremony tiny photon (particle of light) bounces down the channel like a bobsleigh traveling down an ice run. Now you adeptness apprehend a arbor of light, traveling in a afire canteen pipe, artlessly to aperture out of the edges. But if afire hits canteen at a actually coffer angle (less than 42 degrees), it reflects ashamed in again—as accepting the canteen were actually a mirror. This aberancy is declared complete centralized reflection. It’s one of the things that keeps afire axial the pipe.
Artwork: Right: Complete centralized assimilation keeps afire accoutrement bouncing down the axial of a fiber-optic cable.
The added action that keeps afire in the channel is the assay of the cable, which is artificial up of two absent parts. The basic allocation of the cable—in the middle—is declared the bulk and that’s the bit the afire advance through. Captivated about the alfresco of the bulk is accretion bandage of canteen declared the cladding. The cladding’s job is to accrue the afire signals axial the core.
Inline Closure can do this because it is artificial of a acclimatized acquaint of canteen to the core. (More technically, the cladding has a lower refractive index.