Optical fiber hollow ellipsoid for directional bend sensing with a large bending range Gong, Huaping ; Wang, D. N. ; Xiong, Mengling ; Zhao, Chun-Liu ; Ni, Kai Abstract Publication: Optical Materials Express Pub Date: June 2017 DOI: 10.1364/OME.7.001767 Bibcode: 2017OMExp...7.1767G