[1] [1] Strake E, Bava G P, Montrosset I. Guide modes of Ti:LiNbO3 channel waveguides: a novel quasi-analytical tech-nique in comparison with the scalar finite-element method [J]. Journal of lightwave technology, 1988, 6(6): 1126-1135

[2] [2] Cao X F, Ramaswamy R V, Ramakant Srivastava. Characterization of annealed proton exchanged LiNbO3 waveg-uides for nonlinear frequency conversion [J]. Journal of lightwave technology, 1992, 10(9): 1302-1313

[3] [3] Clark D F, Nutt A C G, Wong K K. Characterization of proton-exchange slab optical waveguide in LiNbO3 [J].Journal of Applied Physics, 1983, 54:6218-6220

[4] [4] Martra McWright Howerton, William K.Burns, Perry R.Skeath et al. Dependence of refractive index on hydrogen concentration in proton exchanged LiNbO3 [J]. IEEE Journal of Quantum Electronics, 1991, 27(3): 593-601

[5] [5] Fedinand Apietu Katsriku, Azizur Rahman B M, Kenneth Thomas Victor Grattan. Finite element analysis of diffused anisotropic optical waveguides [J]. Journal of Lightwave Technology, 1996, 14(5): 780-786