High-sensitivity strain sensor based on in-fiber improved Fabry–Perot interferometer Liu, Shen ; Wang, Yiping ; Liao, Changrui ; Wang, Guanjun ; Li, Zhengyong ; Wang, Qiao ; Zhou, Jiangtao ; Yang, Kaiming ; Zhong, Xiaoyong ; Zhao, Jing ; Tang, Jian Abstract Publication: Optics Letters Pub Date: April 2014 DOI: 10.1364/OL.39.002121 Bibcode: 2014OptL...39.2121L