Title :
Modelling of Supercontinuum Generation in the Germanium-on-Silicon Waveguided Platform
Author :
De Leonardis, Francesco ; Troia, Benedetto ; Soref, Richard A. ; Passaro, Vittorio M. N.
Author_Institution :
Dept. of Electr. & Inf. Eng., Politec. di Bari, Bari, Italy
Abstract :
The influence of high-order susceptibilities on the supercontinuum generation process in germanium-on-silicon waveguides has been investigated in detail in the midinfrared. The frequency dispersion of both the three-photon absorption coefficient and the real part of the fifth-order susceptibility has been investigated in order to develop a self-consistent modeling based upon a generalized nonlinear Schrödinger equation. Numerical results demonstrate that germanium-on-silicon waveguides can be used to induce supercontinuum generation over 1.34-μm-wide bandwidth with 200-fs input pulses pumped at a wavelength of 4 μm with peak pump powers of 89 W and waveguide lengths of 4.6 mm. The soliton fission process has also been observed as it is the main mechanism behind the supercontinuum generation.
Keywords :
Schrodinger equation; absorption coefficients; elemental semiconductors; germanium; integrated optics; multiphoton processes; optical dispersion; optical pumping; optical solitons; optical waveguide theory; silicon; supercontinuum generation; Ge-Si; fifth-order susceptibility; frequency dispersion; generalized nonlinear Schrodinger equation; germanium-on-silicon waveguided platform; high-order susceptibility; pump powers; self-consistent modeling; soliton fission process; supercontinuum generation modelling; three-photon absorption coefficient; time 200 fs; waveguide length; wavelength 4 mum; Absorption; Bandwidth; Dispersion; Mathematical model; Optical waveguides; Photonics; Solitons; Germanium Technology; Germanium technology; Nonlinear optical devices; Optical waveguides; Supercontinuum generation; nonlinear optical devices; optical waveguides; supercontinuum generation;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2015.2474133
