Octave-spanning coherent supercontinuum generation in silicon on insulator from 1.06μm to beyond 2.4μm

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Issue Date
2018
Authors
Singh, Neetesh
Xin, Ming
Vermeulen, Diedrik
Shtyrkova, Katia
Li, Nanxi
Callahan, Patrick T.
Magden, Emir Salih
Ruocco, Alfonso
Fahrenkopf, Nicholas
Baiocco, Christopher
Publisher
Changchun Institute of Optics, Fine Mechanics and Physics
Keywords
coherence , integrated photonics , silicon , supercontinuum , insulation , semiconductor
Abstract
Efficient complementary metal-oxide semiconductor-based nonlinear optical devices in the near-infrared are in strong demand. Due to two-photon absorption in silicon, however, much nonlinear research is shifting towards unconventional photonics platforms. In this work, we demonstrate the generation of an octave-spanning coherent supercontinuum in a silicon waveguide covering the spectral region from the near- to shortwave-infrared. With input pulses of 18 pJ in energy, the generated signal spans the wavelength range from the edge of the silicon transmission window, approximately 1.06 to beyond 2.4 μm, with a − 20 dB bandwidth covering 1.124–2.4 μm. An octave-spanning supercontinuum was also observed at the energy levels as low as 4 pJ (−35 dB bandwidth). We also measured the coherence over an octave, obtaining gð1Þ 12 l ð Þ >90%, in good agreement with the simulations. In addition, we demonstrate optimization of the third-order dispersion of the waveguide to strengthen the dispersive wave and discuss the advantage of having a soliton at the long wavelength edge of an octave-spanning signal for nonlinear applications. This research paves the way for applications, such as chip-scale precision spectroscopy, optical coherence tomography, optical frequency metrology, frequency synthesis and wide-band wavelength division multiplexing in the telecom window.
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