Nonlinear characterization and modeling of periodically poled lithium niobate waveguides for 1,5-μm-band cascaded wavelength conversion

We present a nonlinear characterization of annealed-proton-exchange lithium niobate channel waveguides in view of their application for wavelength shifting in wavelength division multiplexing systems. We exploit second harmonic generation as a very sensitive technique to test waveguide uniformity and optical quality. The experimental results are successfully compared with those obtained using numerical simulations based on the finite element method. The analysis suggests useful criteria for the optimization of the fabrication parameters in order to enhance the efficiency of wavelength conversion processes.

[1]  A. S. Greenblatt,et al.  Dependence of refractive index on hydrogen concentration in proton exchanged LiNbO/sub 3/ , 1991 .

[2]  Ilaria Cristiani,et al.  Wavelength shifting of optical pulses through cascaded second-order processes in a lithium–niobate channel waveguide , 1999 .

[3]  S. Yoo.  Wavelength conversion technologies for WDM network applications , 1996 .

[4]  M. Fejer,et al.  Annealed proton-exchanged LiNbO(3) waveguides. , 1991, Optics letters.

[5]  Martin M. Fejer,et al.  1.5-μm-band wavelength conversion based on cascaded second-order nonlinearity in LiNbO 3 waveguides , 1999 .

[6]  D. Fortusini,et al.  Wavelength shifting and amplification of optical pulses through cascaded second-order processes in periodically poled lithium niobate , 1998 .

[7]  Pascal Baldi,et al.  Biaxial characteristics of planar proton exchanged lithium niobate waveguides , 1997 .

[8]  G. Stegeman,et al.  Wavelength shifting using cascaded second-order processes for WDM applications at 1.55 /spl mu/m , 1998 .

[9]  M. Lawrence,et al.  A temperature-dependent dispersion equation for congruently grown lithium niobate , 1984 .

[10]  Gunnar Arvidsson,et al.  Influence of various imperfections on the conversion efficiency of second-harmonic generation in quasi-phase-matching lithium niobate waveguides , 1993 .

[11]  Giovanni Tartarini,et al.  Efficient β-formulation for the FEM analysis of leaky modes in general anisotropic channel waveguides , 2000 .

[12]  D. Fortusini,et al.  Frequency shifting through cascaded second-order processes in a N-(4-nitrophenyl)- L-prolinol crystal. , 1998, Optics letters.