"Optical fiber" refers to a thin, flexible and transparent material that can transmit data using light rather than electricity. It is like a tiny pipe that carries information by sending laser signals through it. Full definition
It consists of bundles of optical fibers that act in concert to efficiently produce powerful laser pulses. (sciencedaily.com)
Such extreme speeds are currently confined in optical fibers. (sciencedaily.com)
In communications the devices will make it easier to separate data carried on various frequencies on a combined stream of white light that passes through optical fibers. (scientificamerican.com)