[1] Adams M J. The cladded parabolic-index profile waveguide: Analysis and application to stripe-geometry lasers. Opt Quant ELect,1978,10(1): 17~29
[2] Hartog A H,Adams M J. On the accuracy of the WKB approximation in optical dielectric waveguides. Opt Quant Elect,1977,9(3): 223~232
[3] Ghetak A K,Thyagarajan K. Graded index optical waveguides;a review,in E. Wolf ed. Progress in Optics,1980,ⅩⅤⅢ: 1~126
[4] Okoshi T,Okamoto K. Analysis of wave propagation in inhomogeneous optical fibers using a variational method.IEEE Trans Microwave Theory Tech,1974,22(11): 938~945
[5] Gambling W A,Matsumura H,Ragdale C M. Wave propagation in a single-mode fiber with dip in the refractive index. Opt Quant Elect,1978,10(5): 301~309
[6] Okamoto K,Okoshi T. Vectorial wave analysis of inhomogeneous optical fibers using finite element method. IEEE Trans Microwave Theory Tech,1978,26(2): 109~144
[7] Clarricoats P J B,Chan K B. Electromagetic wave propagation along radially inhomogeneous dielectric cylinders. Electron Lett,1970,6(22): 694~695
[8] Meunier J P,Pigeon J,Massot J N. A general approach to the numerical determination of modal propagation constants and field distributions of optical fibers. Opt Quant Elect,1981,13(1): 71~83
[9] Angelis G D,Panariello G,Scaglione A. A variational method to approximate the field of weakly guiding optical fibers by Laguerre-Gauss/Bessel expansion. J Lightwave Technol,1999,17(12): 2665~2674
[10] Adams M J. It discusses the slab waveguides but also suits to optical fibers. An Introduction to Optical Waveguides. New York: John Wiley & Sons,1981.100~102
[11] Abramowitz M,Stegun A. Handbook of Mathematical Functions. New York: Dover,1965
[12] Snyder A W. Coupled-mode theory for optical fibers. J Opt Soc Am,1972,62(11): 1267~1277
[13] Feng D,Li Z,Tang D. Acta Photonica Sinica,2003,32(11): 1316~1320
[14] Xue C,Zhu S X,Xiao Z G. Acta Photonica Sinica,2004,33(7): 803~805
[15] Lin X,Li P,Wang Q. Acta Photonica Sinica,2004,33(5): 540~543