Title :
Second order nonlinear interactions in periodic waveguides
Author :
Orazio, A.D. ; de Ceglia, D. ; De Sario, M. ; Petruzzelli, V. ; Prudenzano, F.
Author_Institution :
Dipt. di Elettrotecnica ed Elettronica, Politecnico di Bari, Italy
Abstract :
We illustrate the results of an investigation of second harmonic generation (SHG) in planar nonlinear waveguides assisted by a Bragg grating, along the propagation direction, reproducing a photonic-bandgap (PBG) structure. The analysis is performed in the time domain using a home-made finite difference time domain (FDTD) computer code that exploits the auxiliary differential equations (ADE) scheme, in order to take into account the dispersion effect. By tuning the signal at the fundamental wavelength at the band edge, the density of optical modes is enhanced, allowing a group velocity decrease and a strong localization of the energy inside the nonlinear structure, the conversion efficiency of the SHG process being drastically increased.
Keywords :
Bragg gratings; differential equations; finite difference time-domain analysis; optical dispersion; optical harmonic generation; optical planar waveguides; optical waveguide theory; periodic structures; photonic band gap; Bragg grating; FDTD computer code; auxiliary differential equations; band edge fundamental wavelength; conversion efficiency; dispersion effect; finite difference time domain computer code; group velocity; nonlinear structure; optical modes; periodic waveguides; photonic-bandgap structure; planar nonlinear waveguides; second harmonic generation; second order nonlinear interactions; time-domain analysis; Bragg gratings; Differential equations; Dispersion; Finite difference methods; Home computing; Optical harmonic generation; Optical waveguides; Performance analysis; Planar waveguides; Time domain analysis;
Conference_Titel :
Transparent Optical Networks, 2004. Proceedings of 2004 6th International Conference on
Print_ISBN :
0-7803-8343-5
DOI :
10.1109/ICTON.2004.1360259
