Abstract
Several years have passed since the demonstration1 that ultraviolet light could be successfully used to permanently modify the refractive index of optical fibers. This permits, for example, the direct writing of phase gratings into the core of a communications fiber, without first removing the cladding material. In this way one can make a low-loss Bragg reflector with a peak reflection wavelength anywhere in one of the communications windows. Recently a number of workers have exploited this principle to make a variety of fiber-based components and devices.
© 1993 Optical Society of America
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