[1] [1] CHEN Wei-guo,LOU Shu-qin,WANG Li-wen,et al.Properties of long period gratings in photonic crystal fibers[J].Chinese Journal of Laser,2009,36(3):699-704.

[2] [2] RAMASWAMI R.Optical fiber communication:from transmission to networking[J].Communications Magazine IEEE,2002,40(5):138-147.

[3] [3] LUAN F,GEORGE A K,HEDLEY T D,et al.All-solid photonic bandgap fiber.[J].Optics Letters,2004,29(2):2369-2371.

[4] [4] HE Z,ZHU Y,DU H.Long-period gratings inscribed in air- and water-filled photonic crystal fiber for refractometric sensing of aqueous solution[J].Applied Physics Letters,2008,92(4):044105.

[5] [5] XIAO L,DEMOKAN M S,JIN W,et al.Fusion splicing photonic crystal fibers and conventional single-mode fibers:microhole collapse effect[J].Journal of Lightwave Technology,2007,25(11):3563-3574.

[6] [6] JIN L,JIN W,JU J,et al.Coupled local-mode theory for strongly modulated long period gratings[J].Journal of Lightwave Technology,2010,28(12):1745-1751.

[7] [7] JIN L,JIN W,JU J,et al.Investigation of long-period grating resonances in hollow-core photonic bandgap fibers[J].Journal of Lightwave Technology ,2011,29(11):1708-1714.

[8] [8] QI Yue-feng,ZHOU Li-ying,BI Wei-hong,et al.Research on transmission mechanism and characteristics of hollow-core photonic bandgap fiber gratings[J].Acta Optica Sinica,2013,33(10):56-61.

[9] [9] COELHO T V N,CARVALHO J P,PONTES M J,et al.A remote long-period grating sensor with electrical interrogation assisted by Raman amplification[J].Optics & Laser Technology,2013,47(4):107-113.

[10] [10] JHA R,VILLATORO J,BADENES G,et al.Refractometry based on a photonic crystal fiber interferometer.[J].Optics Letters,2009,34(5):912-915.

[11] [11] TURAN E.Fiber grating spectra[J].Journal of Lightwave Technology,1997,15(8):1468-1488.

[12] [12] JHA R,VILLATORO J,BADENES G,et al.Refractometry based on a photonic crystal fiber interferometer[J].Optics Letters,2009,34(5):617-619.

[13] [13] NI Y,ZHANG L,AN L,et al.Dual-core photonic crystal fiber for dispersion compensation[J].Photonics Technology Letters IEEE,2004,16(6):1516-1518.

[14] [14] FENG De-quan,QIAO Xue-guang,WANG Hong-liang,et al.Experimental study of large range enhanced pressure sensitivity concerning fiber Bragg grating pressure sensor[J].Acta Photonica Sinica,2007,36(7):1273-1276.

[15] [15] WEIBLEN R,DOCHERTY A,HU J,et al.Calculation of the expected bandwidth for a mid-infrared supercontinuum source based on As(2)S(3) chalcogenide photonic crystal fibers[J].Optics Express,2010,18(25):26666-26674.