[1] [1] Wysocki P F, Judkins J B, Espindola R P et al.. Broad band erbium doped fiber amplifier flattened beyond 40 nm using long-period grating filter. IEEE Photonics Technol. Lett., 1997, 9(10):1343～1345

[2] [2] Chen W T, Wang L A. Optical coupling between single mode fibres by utilizing long-period fibre gratings. Electron. Lett., 1999, 35(5):421～423

[3] [3] Eggleton B J, Slusher R E, Judkins J B et al.. All-optical switching in long-period fiber gratings. Opt. Lett., 1996, 22(12):883～888

[4] [4] Bhatia V, Vengsarkar A M. Optical fiber long-period gratings sensors. Opt. Lett., 1996, 21(9):692～694

[5] [5] Pilevar S. MacDougall T W, Davis C C. Growth and sensitivity of the resonant peaks of long period gratings. Proc. SPIE, 1999, 3746:474～477

[6] [6] Lee B H, Liu Y, Lee S B et al.. Displacements of the resonant peaks of a long-period fiber grating induced by a change of ambient refractive index. Opt. Lett., 1996, 22(23):1769～1770

[7] [7] Erdogen T. Cladding-mode resonances in short- and long-period fiber grating filters. J. Opt. Soc. Am. (A), 1997, 14(8):1760～1773

[8] [8] Othonos A, Kalli K. Fiber Bragg Grating-Fundamentals and Applications in Telecommunications and Sensing. Boston·London: Artech House, 1999. 189～222