[2] Byeong Ha Lee, Yu Liu, Sang et al.. Displacement of the resonant peaks of a long-period fiber grating induced by a change of ambient refractive index. Opt. Lett., 1997, 22(23):1769～1771
[3] Patrick H J, Kersey A D, Bucholtz F. Analysis the response of long period fiber gratings to external index of refraction. J. Lightwave Technol., 1998, 16(9):1606～1611
[4] Yahei Koyamada. Numerical analysis of core-mode to radiation-mode coupling in long-period fiber gratings. IEEE Photon. Technol. Lett., 2001, 13(4):308～310
[5] Palik, Eduard D. Handbook of Optical Constants of Solids. San Diego: Academic Press, Inc., 1985
[6] Gloge D. Weakly guiding fibers. Appl. Opt., 1971, 10(10):2252～2258
[7] Schlereth K H, Tacke M. The complex proragation constant of multilayer waveguides: an algorithm for a personal computer. IEEE J. Quant. Electron., 1990, 26(4):627～630
[8] Gombert J, Gazard M. Attenuation characteristics of a planar dielectric coated metallic waveguide for 10.6 nm radiation. Opt. Commun., 1986, 58(3):307～311
[10] Constantini D M, Muller C A P. Tunable loss filter based on metal-coated long-period fiber grating. IEEE Photon. Technol. Lett., 1999, 11(11):1458～1460
[11] Seo H S, Paek U C. Melt coating of tin on silica optical fiber. J. Lightwave Technol., 1998, 16(12):2355～2364
