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Proceedings Paper

Foundry-compatible SOI waveguides with a graphene top layer for wideband wavelength conversion
Author(s): N. Vermeulen; J. L. Cheng; J. E. Sipe; H. Thienpont
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Paper Abstract

The tremendous progress in the fabrication of highly confining silicon-on-insulator (SOI) waveguides has been very beneficial for four-wave-mixing (FWM)-based wavelength conversion applications. Nevertheless, to establish power-efficient and wideband FWM wavelength conversion, one typically requires long (cm-scale) SOI waveguides with dispersion-engineered cross-sections that do not comply with the fabrication constraints of multiproject- wafer-oriented silicon photonics foundries. In this paper, we numerically examine the opportunities for wideband wavelength conversion through FWM in a foundry-compatible SOI waveguide covered with the highly nonlinear two-dimensional material of graphene. When combining subwatt level pump powers with a short waveguide length of only a few hundreds of microns, perfectly phase-matched conversion with significant efficiencies close to 20 dB can be obtained over a more than 40 THz-wide signal band adjacent to the pump frequency. Because of the tunability of the graphene properties, it is also possible to obtain quasi-phase matched FWM conversion through a periodic sign reversal of the graphene third-order nonlinearity along the waveguide. Conversion efficiencies exceeding 30 dB can be achieved over a 3.4 THz-wide signal band that is situated as much as 58 THz away from the pump frequency. Finally, the graphene tunability also allows for switching between the perfectly phase-matched and quasi-phase-matched operation modes.

Paper Details

Date Published: 13 May 2016
PDF: 15 pages
Proc. SPIE 9891, Silicon Photonics and Photonic Integrated Circuits V, 98911B (13 May 2016); doi: 10.1117/12.2228106
Show Author Affiliations
N. Vermeulen, Vrije Univ. Brussel (Belgium)
J. L. Cheng, Vrije Univ. Brussel (Belgium)
Univ. of Toronto (Canada)
J. E. Sipe, Univ. of Toronto (Canada)
H. Thienpont, Vrije Univ. Brussel (Belgium)

Published in SPIE Proceedings Vol. 9891:
Silicon Photonics and Photonic Integrated Circuits V
Laurent Vivien; Lorenzo Pavesi; Stefano Pelli, Editor(s)

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