Abstract
We report a novel method to increase the UV photosensitivity of optical fibers based on exposure to laser irradiation before grating writing. Fibers treated with a laser can produce gratings with refractive-index modulation two times greater and a Bragg wavelength that can be 2 nm longer than those of untreated fibers. Experiments on preform samples treated with a laser in a way similar to the fibers showed a marked increase of the 242-nm absorption band, which is associated with an increase of germanium oxygen-deficient centers and is believed to be responsible for the higher photorefractive response.
© 1999 Optical Society of America
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