After inscribing an ordinary grating in a multimode fiber, the reflectivity spectrum of this grating is studied when the fiber is subjected to a longitudinal static strain. It is observed that the phase-matching condition is approximately satisfied by a few modes, causing the appearance of lateral lobes. Variations in magnitude and peak wavelengths of these reflectivity spectrum lobes are observed and analyzed when the fiber is subjected to an applied strain.
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Cazo et al. (2000) studied this question.
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