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
Byeong Ha Lee, Yu Liu, Sang Bae Lee, Sang Sam Choi, and Joo Nyung Jang, "Displacements of the resonant peaks of a long-period fiber grating induced by a change of ambient refractive index," Opt. Lett. 22, 1769-1771 (1997)