[1] [1] Birks T A, Li Y W. The shape of fiber tapers. J. Lightwave Technol., 1992, 10(4):432～438

[2] [2] Vengsarkar M, Lemaire P J, Judkins J B et al.. Long-period fiber gratings as band-rejection filters. J. Lightwave Technol., 1996, 14(1): 58～65

[4] [4] Daxhelet X, Lacroix S, Gonthier F. Fibre mode expansion for 2-D waveguide calculations. Opt. Quant. Electron., 1997, 29: 139～150

[5] [5] Snyder A W, Love J D. Optical Waveguide Theory. London, U.K., Chapman and Hall, 1983

[6] [6] Dimmick T E, Kakarantzas G, Birks T A et al.. Narrow-band acousto-optic tunable filter fabricated from highly uniform tapered optical fiber. Proc. OFC′2000, 2000, FB4