[1] [1] K.S.Chiang,Q.Liu.Long-period gratings for application in optical communications[C].Proceedings of the 5th International Conference on Optical Communications and Networks and the 2nd International Symposium on Advances and Trends in Fiber Optics and Applications (ICOCN/ATFO 2006) Chengdu,2006.128-133

[2] [2] S.W.James,R.P.Tatam.Optical fibre long-period grating sensors:characteristics and application [J].Meas.Sci.Technol.,2003,14(5):R49-R61

[3] [3] C.Y.Lin,L.A.Wang,G.W.Chern.Corrugated long-period fiber gratings as strain,torsion and bending sensors[J].J.Lightwave Technol.,2001,19(8):1159-1168

[4] [4] Y.Kondo,K.Nouchi,T.Mitsuyu et al..Fabrication of long-period fiber gratings by focused irradiation of infrared femtosecond laser pulses [J].Opt.Lett.,1999,24(10):646-648

[5] [5] G.Rego,O.Okhotnikov,E.Dianov et al..High-temperature stability of long-period fiber gratings using an electric arc [J].J.Lightwave Technol.,2001,19(10):1574-1579

[6] [6] Y.J.Rao,Y.P.Wang,Z.L.Ran et al..Novel fiber-optic sensors based on long-period fiber gratings written by high-frequency CO2 laser pulses [J].J.Lightwave Technol.,2003,21(5):1320-1327

[7] [7] Hu Aizi,Rao Yunjiang,Niu Yongchang.A novel tunable LPFG gain equalizer based on a bend insensitive fiber [J].Acta Optica Sinica,2005,25(1):30-34

[8] [8] Zhao Hongxia,Bao Jilong,Chen Ying.Bending sensing rules for long period fiber gratings [J].Acta Optica Sinica,2008,28(9):1681-1685

[9] [9] Wang Jiuling,Rao Yunjiang,Zhu Tao.High-temperature and strain characteristics of long period grating with asymmetric refrctive index profile in the cross section of fiber[J].Chinese J.Lasers,2007,34(3):389-392

[10] [10] S.Oh,K.R.Lee,U.C.Paek et al..Fabrication of helical long-period fiber gratings by use of a CO2 laser[J].Opt.Lett.,2004,29(13):1464-1466

[11] [11] Wang Yiping,Rao Yunjiang,Hu Aizi.A novel long-period fiber grating torsion sensor [J].Acta Optica Sinica,2002,22(9):1096-1099

[12] [12] T.Zhu,Y.J.Rao,J.L.Wang et al..Strain sensor without temperature compensation based on a LPFG with strongly rotary refractive index modulation [J].Electron.Lett.,2007,43(21):1132-1134

[13] [13] Song Yun,Zhu Tao,Rao Yunjiang.Simultaneous measurement of strain and temperature using a long-period fiber grating with rotary refractive index modulation[J].Chinese J.Lasers,2009,36(5):1129-1133

[14] [14] Rao Yunjiang,Wang Yiping,Zhu Tao.Principles and Application of Fiber Gratings[M].Beijing:Science Press,2006.253-259