Abstract
We have produced. Bragg gratings of up to 50% reflectance by exposing optical fibers to a continuous-wave (cw) ultraviolet interference pattern incident from the side of the fiber. The exposure causes a periodic modulation of the index of refraction of the fiber core. Light of free space wavelength λ propagating down tire fiber is reflected if it meets the Bragg reflection condition of λ = 2nAg, where A3 is the period of the index modulation and n is the average index of refraction of the core.
© 1993 Optical Society of America
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