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Experimental study demonstrates single-pulse inscription of Bragg gratings in germanium-doped silica fibers, suggesting rapid fabrication of optical fiber reflectors.
Narrow-line, permanent Bragg reflection gratings have been created in Ge-doped silica-core optical fibers by interfering beams of a single 20-ns pulse of KrF excimer laser light. Of the fibers studied, the highest reflectance value of ~2% was observed with a linewidth (FWHM) of 0.1 nm, which corresponds to a 2-mm grating length with an index modulation of ~3 x 10(-5).
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Askins et al. (1992) studied this question.
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