[1] C. S. Ih, Appl. Opt. 11, 694 (1972).
[2] S. P. Chang, J. M. Kuo, Y. P. Lee, C. M. Lu, and K. J. Ling, Appl. Opt. 37, 747 (1998).
[3] W. W. Simmons, G. W. Leppelmeier, and B. C. Johnson, Appl. Opt. 13, 1629 (1974).
[4] S. R. Jahan and M. A. Karim, Opt. Laser Technol. 21, 27 (1989).
[5] P. W. Rhodes and D. L. Shealy, Appl. Opt. 19, 3545 (1980).
[6] K. Nemoto, T. Fujii, N. Goto, H. Takino, T. Kobayashi, N. Shibata, K. Yamamura, and Y. Mori, Appl. Opt. 36, 551 (1997).
[7] C.-Y. Han, Y. Ishii, and K. Murata, Appl. Opt. 22, 3644 (1983).
[8] R. E. Setchell, Proc. SPIE 4095, 74 (2000).
[9] K. Kawano and T. Kitoh, Introduction to Optical Waveguide Analysis (John Wiley & Sons, Inc., New York, 2001).
[10] C. A. De Francisco, B. V. Borges, and M. A. Romero, Microwave Opt. Technol. Lett. 38, 418 (2003).
[11] G. P. Agrawal, Nonlinear Fiber Optics (Academic Press, SanDiego, California, 2001).
[12] Z. Zhu and T. G. Brown, Opt. Exp. 8, 547 (2001).
[13] A. W. Snyder and J. D. Love, Optical Waveguide Theory (Chapman and Hall, London, 1983).