Wideband nonlinear spectral broadening in ultra-short ultra-silicon rich nitride waveguides

Wideband nonlinear spectral broadening in ultra-short ultra-silicon rich nitride waveguides
Title:
Wideband nonlinear spectral broadening in ultra-short ultra-silicon rich nitride waveguides
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Scientific Reports
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Publication Date:
08 June 2016
Citation:
Scientific Reports 6, Article number: 27120 (2016)
Abstract:
CMOS-compatible nonlinear optics platforms with high Kerr nonlinearity facilitate the generation of broadband spectra based on self-phase modulation. Our ultra – silicon rich nitride (USRN) platform is designed to have a large nonlinear refractive index and low nonlinear losses at 1.55 μm for the facilitation of wideband spectral broadening. We investigate the ultrafast spectral characteristics of USRN waveguides with 1-mm-length, which have high nonlinear parameters (γ ∼ 550 W−1/m) and anomalous dispersion at 1.55 μm wavelength of input light. USRN add-drop ring resonators broaden output spectra by a factor of 2 compared with the bandwidth of input fs laser with the highest quality factors of 11000 and 15000. Two – fold self phase modulation induced spectral broadening is observed using waveguides only 430 μm in length, whereas a quadrupling of the output bandwidth is observed with USRN waveguides with a 1-mm-length. A broadening factor of around 3 per 1 mm length is achieved in the USRN waveguides, a value which is comparatively larger than many other CMOS-compatible platforms.
License type:
http://creativecommons.org/licenses/by/4.0/
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ISSN:
2045-2322
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