[1] [1] Heather J. Patrick, Alan D. Kersey, Frank Bucholtz. Analysis of the response of long period fiber gratings to external index of refraction[J]. J. Lightwave Technol., 1998, 16(9): 1606～1612

[2] [2] R. Falciai, A. G. Mignani, A. Vannini. Long period gratings as solution concentration sensors[J]. Sensors and Actuators B, 2001, 74(1～3): 74～77

[3] [3] Xuewen Shu, Lin Zhang, Ian Bennion. Sensitivity characteristics of long-period fiber gratings[J]. J. Lightwave Technol., 2002, 20(2): 255～266

[4] [4] V. Bhatia, A. M. Vengsarkar. Optical fiber long-period grating sensors[J]. Opt. Lett., 1996, 21: 692～694

[5] [5] K. S. Chiang, Y. Liu, X. Dong. Analysis of etched long-period fiber grating and its response to external refractive index[J]. Electron. Lett., 2000, 16： 966～967

[6] [6] K. Schroeder, W. Ecke, R. Mueller et al.. A fiber Bragg grating refractometer[J]. Meas. Sci. Technol., 2001, 12(7): 757～764

[7] [7] K. Zhou, X. Chen, L. Zhang et al.. High-sensitivity optical chemsensor based on etched D-fibre Bragg gratings[J]. Electron. Lett., 2004, 40(4): 232～234

[8] [8] Shen Le, Zheng Shilie, Zhang Xianmin. The response of side-polished FBG to external refractive index[J]. Acta Photonica Sinica, 2005, 34(7): 1036～1038

[9] [9] G. Laffont, P. Ferdinand. Titled short-period fiber-Bragg-grating-induced coupling to cladding modes for accurate refractometry[J]. Meas. Sci. Technol., 2001, 12(7): 765～770

[10] [10] Yun Binfeng, Chen Na, Cui Yiping. Refractive index sensing characteristics of fiber Bragg grating based on cladding mode[J]. Acta Optica Sinica, 2006, 26(7): 1013～1015

[11] [11] Xu Junjiao, Li Jie, Rong Huabei et al.. Analysis and measurement on refractive index sensing of few mode fiber Bragg gratings[J]. Acta Optica Sinica, 2008, 28(3): 565～568

[12] [12] Zhao C L, Yang X F, Demokan M S et al.. Simultaneous temperature and refractive index measurements using a 3 degrees slanted multimode fiber Bragg grating[J]. J. Lightwave Technol., 2006, 24: 879～883

[13] [13] Chan C F, Chen C, Jafari A et al.. Optical fiber refractometer using narrowband cladding-mode resonance shifts[J]. Appl. Opt., 2007, 46: 1142～1149

[14] [14] T. Erdogan. Cladding-mode resonances in short and long period fiber grating filters[J]. J. Opt. Soc. Am. A, 1997, 14: 1760～1773