Two Revolutionary Optical Technologies

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During recent years, information technology has revolutionized the daily life. This is to a large part due to the development of electronic and optical devices and systems. The first ideas of applications of light guiding in glass fibers i.e. small glass rods) date from the late 1920's. They were all about image transmission through a bundle of fibers. The motivation was medicine (Gastroscope), defense flexible periscope, image scrambler and even early television. Bare glass fibers were, however, quite leaky and did not transmit much light. Each time the fibers were touching each other, or when the surface of the fibers was scratched, light was led away from the fibers.