Title :
Spatial optical solitons in nonlinearly coupled lithium niobate waveguides
Author :
Falco, Andrea Di ; Assanto, Gaetano
Author_Institution :
Dept. of Electron. Eng., Univ. Roma Tre, Rome, Italy
fDate :
4/1/2003 12:00:00 AM
Abstract :
We numerically investigate a novel type of quadratic spatial solitons in the system of surface and buried planar waveguides obtained via direct- and reverse-proton exchange in z-cut lithium niobate, respectively, and coupled by the second-order susceptibility. Through frequency doubling, transverse-electric and transverse-magnetic modes lock into a 1+1D solitary wave encompassing orthogonal field components at the two harmonic wavelengths. The phase matching scheme leads to a wavelength-comb filter with adjustable linewidths.
Keywords :
lithium compounds; nonlinear optical susceptibility; optical harmonic generation; optical phase matching; optical planar waveguides; optical solitons; optical waveguide filters; photorefractive materials; LiNbO/sub 3/; adjustable linewidths; buried planar waveguides; direct proton exchange; frequency doubling; harmonic wavelengths; nonlinearly coupled lithium niobate waveguides; orthogonal field components; phase matching; quadratic spatial solitons; reverse-proton exchange; second-order susceptibility; solitary wave; spatial optical solitons; surface planar waveguides; transverse-electric modes; transverse-magnetic modes; wavelength-comb filter; Frequency; Laser mode locking; Lithium niobate; Optical coupling; Optical planar waveguides; Optical solitons; Optical surface waves; Optical waveguides; Planar waveguides; Surface waves;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2003.809295
