M. Rottschalk, A. Rasch, and W. Karthe, Electrooptic behaviour of proton-exchanged LiNbO 3 optical waveguides, J. Opt. Commun, vol.9, pp.19-23, 1988.

L. Chanvillard, P. Aschieri, P. Baldi, D. B. Ostrowsky, M. De-micheli et al., Soft proton exchange on periodically poled LiNbO3: A simple waveguide fabrication process for highly efficient nonlinear interactions, Applied Physics Letters, vol.76, issue.9, p.1089, 2000.
DOI : 10.1364/OL.24.000896

D. Castaldini, P. Bassi, S. Tascu, P. Aschieri, M. P. De-micheli et al., Soft-Proton-Exchange Tapers for Low Insertion-Loss $ \hbox{LiNbO}_{3}$ Devices, Journal of Lightwave Technology, vol.25, issue.6, pp.1588-1593, 2007.
DOI : 10.1109/JLT.2007.896790

M. Mp-de, Fabrication and Characterization of Proton Exchanged Waveguides in Periodically Poled Congruent Lithium Niobate, Ferroelectrics, vol.340, pp.49-62, 2006.

M. De-micheli, D. Ostrowsky, J. Barety, C. Canali, A. Carnera et al., Crystalline and optical quality of proton exchanged waveguides, Journal of Lightwave Technology, vol.4, issue.7, pp.743-745, 1986.
DOI : 10.1109/JLT.1986.1074799

Y. N. Korkishko, V. A. Fedorov, M. De-micheli, K. Hadi, P. Baldi et al., Relationships between structural and optical properties of proton-exchanged waveguides on Z-cut lithium niobate, Applied Optics, vol.35, issue.36, pp.7056-7060, 1996.
DOI : 10.1364/AO.35.007056

C. Segato, S. M. Sada, and . Kostritskii, Characterization of ?-phase soft proton-exchanged LiNbO 3 optical waveguides, J. Opt. Soc. Am. A, vol.18, pp.1186-1191, 2001.

A. S. Barker and A. J. Sievers, Optical studies of the vibrational properties of disordered solids, Reviews of Modern Physics, vol.10, issue.S2, pp.1-179, 1975.
DOI : 10.1103/PhysRevB.10.607

S. H. Wemple, M. D. Domenico, and I. Camlibel, , AND OTHER OXYGEN???OCTAHEDRA FERROELECTRICS BASED ON DIRECT MEASUREMENT OF SPONTANEOUS POLARIZATION, Applied Physics Letters, vol.12, issue.6, pp.209-212, 1968.
DOI : 10.1063/1.1754375

M. D. Domenico and S. H. Wemple, Oxygen???Octahedra Ferroelectrics. I. Theory of Electro???optical and Nonlinear optical Effects, Journal of Applied Physics, vol.40, issue.2, pp.720-732, 1969.
DOI : 10.1107/S0365110X57000341

M. Kuneva and S. Tonchev, Spectroscopy of optical waveguiding layers, Bulgarian Chemical Communications, vol.43, pp.276-287, 2011.

G. R. Paz-pujalt, D. D. Tuschel, G. Braunstein, T. Blanton, S. Tong-lee et al., Characterization of proton exchange lithium niobate waveguides, Journal of Applied Physics, vol.101, issue.7, pp.3981-3987, 1994.
DOI : 10.1016/0030-4018(93)90741-M