[1] [1] Wang Jiuling, Rao Yunjiang, Zhu Tao et al.. Refractive index characteristic for edge-written long-period fiber gratings induced by CO2 laser pulses[J]. Acta Optica Sinica, 2007, 27(10): 1730～1734

[2] [2] Zhao Xiaoyun,Gu Zhengtian. Spectral characteristics of triple-clad cascaded long-period fiber gratings[J]. Chinese J. Lasers, 2008, 35(10): 1532～1537

[3] [3] J. C.Knight, T. A. Birks, P. St. J. Russell et al.. All-silica single-mode optical fiber with photonic crystal cladding[J]. Opt. Lett., 1996, 21(19): 1547～1549

[4] [4] P. St. J. Russell. Photonic-crystal fibers [J]. J. Lightwave Technol., 2006, 24(12): 4729～4749

[5] [5] B. J. Eggleton, P. S. Westbrook, R. S. Windeler et al.. Grating resonances in air-silica microstructured optical fibers [J]. Opt. Lett.,1999, 24(21): 1460～1462

[6] [6] Georges Humbert, Abdelrafik Malki, Sébastien Février. Characterizations at high temperatures of long-period gratings written in germanium-free air-silica microstructure fiber [J]. Opt. Lett.,2004, 29(1): 38～40

[7] [7] G. Kakarantzas, T. A. Birks, P. St. J. Russell. Structural long-period gratings in photonic crystal fibers [J]. Opt. Lett.,2002, 27(12): 1013～1015

[8] [8] Jong H. Lim, Kyung S. Lee, Jin C. Kim et al.. Tunable fiber gratings fabricated in photonic crystal fiber by use of mechanical pressure[J]. Opt. Lett.,2004, 29(4):331～333

[9] [9] A. Diez, T. A. Birks, W. H. Reeves et al.. Excitation of cladding modes in photonic crystal fibers by flexural acoustic waves [J]. Opt. Lett., 2000, 25(20): 1499～1501

[10] [10] Turan Erdogan. Fiber grating spectra [J]. J. Lightwave Technol., 1997, 15(8): 1277～1294

[11] [11] B. J. Eggleton,C. Kerbage,P. S. Westbrook et al.．Microstructured optical fiber devices [J]. Opt. Express,2001,9(13):698～713

[12] [12] Ren Guobin, Lou Shuqin, Wang Zhi et al.. Study on dispersion properties of photonic crystal fiber by equivalent-index model[J]. Acta Optica Sinica, 2004, 24(3): 319～323

[13] [13] Zhao Xingtao, Hou Lantian, Liu Zhaolun et al.. Improved fully vectorial effective index method in photonic crystal fiber[J]. Appl. Opt.,2007,46(19):4052～4056

[14] [14] Kwang N. Parka, Turan Erdogan Kyung S. Lee. Cladding mode coupling in long-period gratings formed in photonic crystal fibers[J]. Opt. Commun., 2006,266:541～545