What is the difference between coherent and incoherent fibers?

In a bundle of fibers, if the relative position of each individual fiber at one end of the bundle is exactly the same as those at the other end, then the fibers are said to be coherent. Coherent fiber bundles such as those in our Fiber Optic Tapers are used to relay an image from one end of the fiber to the other, whereas incoherent fiber bundles cannot. Incoherent fibers are primarily used to transmit light or signals rather than images.