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Formation of Bragg gratings in optical fibers by a transverse holographic method

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Abstract

Bragg gratings have been produced in germanosilicate optical fibers by exposing the core, through the side of the cladding, to a coherent UV two-beam interference pattern with a wavelength selected to lie in the oxygen-vacancy defect band of germania, near 244 nm. Fractional index perturbations of approximately 3 × 10−5 have been written in a 4.4-mm length of the core with a 5-min exposure. The Bragg filters formed by this new technique had reflectivities of 50–55% and spectral widths, at half-maximum, of 42 GHz.

© 1989 Optical Society of America

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