Abstract

We present a graphic method of analyzing the spectral displacements of a long-period fiber grating as a function of ambient index. Mode dependence of the maximum displacement, disappearance of a particular resonance peak, and spectral behavior when the ambient index is larger than that of the cladding material are investigated and compared with experimental results.

© 1997 Optical Society of America

Measurement of refractive-index variation with temperature by use of long-period fiber gratings

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