Abstract
We demonstrate ultrabroad-bandwidth low-power frequency conversion of continuous-wave light in a dispersion engineered silicon nanowaveguide via four-wave mixing. Our process produces continuously tunable four-wave mixing wavelength conversion over two-thirds of an octave from 1241-nm to 2078-nm wavelength light with a pump wavelength in the telecommunications C-band.
Highlights
The ability to generate and utilize large bandwidths using parametric processes is crucial for a large range of photonic applications including signal processing and communications [1,2,3,4], optical frequency metrology [5], ultrafast all-optical processing [6,7], and spectroscopy [8]
We demonstrate ultrabroad-bandwidth low-power frequency conversion of continuous-wave light in a dispersion engineered silicon nanowaveguide via four-wave mixing
The ability to parametrically convert light over this ultra-broad-bandwidth gives rise to new functionality for silicon photonics and can have application in spectroscopy, ultrafast optical processing and measurement, and optical frequency metrology
Summary
The ability to generate and utilize large bandwidths using parametric processes is crucial for a large range of photonic applications including signal processing and communications [1,2,3,4], optical frequency metrology [5], ultrafast all-optical processing [6,7], and spectroscopy [8]. The large effective nonlinearity of silicon nanowaveguides enables efficient nonlinear processes in short cm-long waveguides, which combined with the ability to tailor the GVD [19,20], allows the process of FWM to be optimized for very large conversion bandwidths [13,15,16]. Maximal FWM conversion bandwidths have not yet been observed due to difficulties in placing the zero-GVD (ZGVD) point within the tuning range of a high-power pump laser. We investigate continuous-wave (CW) FWM in silicon waveguides with the first ZGVD point near the center of the C-band where high-power pump lasers are readily available. We observe an extremely broad conversion bandwidth of 837 nm which allows for continuously tunable wavelength conversion from 1241 nm to 2078 nm with a pump wavelength of 1554 nm
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