Bilayer dispersion-flattened waveguides with four zero-dispersion wavelengths

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Abstract
We propose a new type of bilayer dispersion-flattened waveguides that have four zero-dispersion wavelengths. Low and flat dispersion can be achieved by using two different material combinations, with a much smaller index contrast as compared to the previously proposed slot-assisted dispersion-flattened waveguides. Without using a nano-slot, dispersion becomes less sensitive to waveguide dimensions, which is highly desirable for high-yield device fabrication. Ultra-low dispersion, high nonlinearity, and fabrication-friendly design would make it promising for practical implementation of nonlinear photonic functions. The proposed waveguide configuration deepens our understanding of the dispersion flattening principle.
Funding Information
  • National Basic Research Program of China (973) (2014CB340104/3)
  • National Natural Science Foundation of China (NSFC) (61377076, 61307085, 61335005)

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