Abstract

The effect of strain on both the index modulation, Δnmod, and average index, Δn¯, during grating regeneration within two types of fibers is studied. Significant tunability of the Bragg wavelength (λB>48nm) is observed during postannealing at or above the strain temperature of the glass. The main reason for the grating wavelength shift during annealing with load is the elongation of the fiber. As well, the observed Moiré interference cycling through regeneration indicates the presence of two gratings.

© 2013 Optical Society of America

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