A topological nonlinear parametric amplifier

Byoung-Uk Sohn, Yue-Xin Huang, Ju Won Choi, George F. R. Chen, Doris K. T. Ng, Shengyuan A. Yang and Dawn T. H. Tan ()
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Byoung-Uk Sohn: Singapore University of Technology and Design
Yue-Xin Huang: Singapore University of Technology and Design
Ju Won Choi: Singapore University of Technology and Design
George F. R. Chen: Singapore University of Technology and Design
Doris K. T. Ng: Institute of Microelectronics, A*STAR
Shengyuan A. Yang: Singapore University of Technology and Design
Dawn T. H. Tan: Singapore University of Technology and Design

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Topological boundary states are well localized eigenstates at the boundary between two different bulk topologies. As long as bulk topology is preserved, the topological boundary mode will endure. Here, we report topological nonlinear parametric amplification of light in a dimerized coupled waveguide system based on the Su-Schrieffer-Heeger model with a domain wall. The good linear transmission properties of the topological waveguide arising from the strong localization of light to the topological boundary is demonstrated through successful high-speed transmission of 30 Gb/s non-return-to-zero and 56 Gb/s pulse amplitude 4-level data. The strong localization of a co-propagating pump and probe to the boundary waveguide is harnessed for efficient, low power optical parametric amplification and wavelength conversion. A nonlinear tuning mechanism is shown to induce chiral symmetry breaking in the topological waveguide, demonstrating a pathway in which Kerr nonlinearities may be applied to tune the topological boundary mode and control the transition to bulk states.

Date: 2022
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DOI: 10.1038/s41467-022-34979-y

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