Displacements of the resonant peaks of a long-period fiber grating induced by a change of ambient refractive index

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. (C) 1997 Optical Society of America.