1. Tamir, T., Integrated Optics, Springer-Verlarg, New York, 1975.
doi:10.1007/978-3-662-43208-2
2. Marcuse, D., "Directional couplers made of nonidentical asymmetric slabs. Part II: Grating-assisted couplers," J. Lightwave Technol., Vol. LT-5, 268-273, 1987.
doi:10.1109/JLT.1987.1075493
3. Huang, W. P. and H. A. Haus, "Power exchange in gratingassisted couplers," J. Lightwave Technol., Vol. 7, 920-924, 1989.
doi:10.1109/50.32359
4. Marcuse, D., "Radiation loss of grating-assisted directional coupler," J. Quantum Electron., Vol. 26, 675-684, 1990.
doi:10.1109/3.53384
5. Griffel, G., M. Itzkovich, and A. A. Hardy, "Coupled mode formulation for directional couplers with longitudinal perturbation," J. Quantum Electron., Vol. 27, 985-994, 1991.
doi:10.1109/3.83333
6. Little, B. E., "A variational coupled-mode theory including radiation loss for grating-assisted couplers," J. Lightwave Technol., Vol. 14, 188-195, 1996.
doi:10.1109/50.482262
7. Watanabe, K. and K. Yasumoto, "Coupled-mode analysis of wave-length filtering in a grating-assisted asymmetric three-waveguide directional coupler," J. Opt. Soc. Am. A, Vol. 14, 2994-3000, 1997.
doi:10.1364/JOSAA.14.002994
8. Yasumoto, K., "Coupled-mode formulation of parallel dielectric waveguides," Opt. Lett., Vol. 18, 503-504, 1993.
doi:10.1364/OL.18.000503
9. Yasumoto, K., "Coupled-mode formulation of parallel dielectric waveguides using singular perturbation technique," Microwave and Opt. Technol. Lett., Vol. 4, 486-491, 1991.
doi:10.1002/mop.4650041119
10. Watanabe, K. and K. Yasumoto, "A novel coupled-mode formulation based on singular perturbation technique," Res. Rep. on Info. Sci. and Electrical Eng. of Kyushu Univ., Vol. 1, 25-30, 1996.
11. Nayfeh, A. H., Introduction to Perturbation Techniques, Wiley, New York, 1981.
12. Yasumoto, K., H. Maeda, and S. Morita, "Numerical analysis of transitions and discontinuities in optical waveguides," 1996 Asia-Pacific Microwave Conf. Proc., 647-650, 1996.
13. Yuen, W. P., "On the different formulations of the coupled-Mode theory for parallel dielectric waveguides," J. Lightwave Technol., Vol. 12, 82-85, 1994.
doi:10.1109/50.265740