Journal
OPTICS LETTERS
Volume 40, Issue 2, Pages 268-271Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.40.000268
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Funding
- EPSRC under the project MIGRATION [EP/L01162X/1]
- Royal Society through his University Research Fellowship
- Engineering and Physical Sciences Research Council [1238894, EP/L00044X/1, EP/J004863/1, EP/L01162X/1] Funding Source: researchfish
- EPSRC [EP/L00044X/1, EP/L01162X/1, EP/J004863/1] Funding Source: UKRI
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All-optical modulation has been demonstrated in a germanium-on-silicon rib waveguide over the mid-infrared wavelength range of 2-3 mu m using a free-carrier absorption scheme. Transmission measurements have shown the waveguides to have low propagation losses that are relatively independent of wavelength out to 3.8 mu m, indicating that the modulation could be extended further into the mid-infrared region for applications in sensing and spectroscopy. By monitoring the material recovery, the free-carrier lifetime of the micron-sized waveguides has been estimated to be similar to 18 ns, allowing for modulation speeds within the megahertz regime. (C) 2015 Optical Society of America
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