All-fiber modal interferometer based on an up-taper-core-offset structure for curvature sensing

Ma Lin†, Qi Yan-Hui‡, Sun Jiang, Kang Ze-Xin, Jian Shui-Sheng

(a) and (c) Transmission spectra of dip A and dip B under different curvatures, and (b) and (d) the relationships between the wavelength shift and the curvature for dip A and dip B.