Concave-lens-like long-period fiber grating bidirectional high-sensitivity bending sensor Zhang, Yun-Shan ; Zhang, Wei-Gang ; Chen, Lei ; Zhang, Yan-Xin ; Wang, Song ; Yu, Lin ; Li, Yan-Ping ; Geng, Peng-Cheng ; Yan, Tie-Yi ; Li, Xin-Yu ; Kong, Ling-Xin Abstract Publication: Optics Letters Pub Date: October 2017 DOI: 10.1364/OL.42.003892 Bibcode: 2017OptL...42.3892Z