[1]           E. Strake, G.P. Bava, and I. Montrosset: Modes of channel waveguides: A novel quasi-analytical technique in comparison with scalar finite-element method, J. Light. Technol. 6, (1988): 1126-1135.

[2]           J. Crank: The mathematics of diffusion. Oxford University Press, New York, (1975).

[3]           G.B. Hocker and W.K. Burns: Mode dispersion in diffused channel waveguides by the effective index method, Appl. Opt. 16, (1977): 113-118.

[4]           J. Nikolopoulos and G.L. Yip: Accurate modeling of the index profile in annealed proton- exchanged LiNbO3, Proc. SPIE 1583, Integrated Optical Circuits, (1991): 71-82.

[5]           J. Nikolopoulos and G.L. Yip: Theoretical modeling and characterization of annealed proton- exchanged planar waveguides in z-cut LiNbo3, J. Light. Technol. 9, (1991): 864-870.

[6]           E.Y.B. Pun, K.K. Loi, and P.S. Chung: Experimental studies of proton-exchanged waveguides in Lithium Niobate using toluic acid, Proc. SPIE 1583, Integrated Optical Circuits, (1991): 64-70.

[7]           J.L. Jackel: Proton exchange: past, present, and future, Proc. SPIE 1583, Integrated Optical Circuits, (1991): 54-63.

[8]           H. Jin, M. Belanger, and Z. Jakubczyk: General analysis of electrodes in integrated-optics and electrooptic devices, J. Quant. Electron. 27, (1991): 243-251.

[9]           H. Jin, R. Vahldieck, M. Belanger, and Z. Jakubczyk: A mode projecting method for the quasi- static analysis of electrooptic device electrodes considering finite metallization thickness and anisotropic substrate, J. Quant. Electron. 27, (1991): 2306-2314.

[10]         R. Syms and J. Cozens: Optical guided waves and devices, Section 3.7, London, McGraw-Hill, (1992).

[11]         A. Yariv: Optical Electronics in Modern Communications. 5th edition, Oxford University Press, (1996).