We propose a design platform to obtain large anomalous dispersion at short wavelengths (in vicinity of 450 nm) in vertically coupled GaN/AlN/GaN waveguides realizable on commercially available GaN template wafer technology. We present finite-difference time-domain simulation based results on dispersion engineering by tuning the waveguide geometry, to obtain anomalous dispersion as large as ps (nm-km)⁻¹. Numerical simulations based on the Lugiato–Lefever model show efficient Kerr frequency comb generation in blue spectral range. We present results based on tailoring the geometric parameters of the waveguides to modify the dispersive wave that induces asymmetrical spectral profile in the comb on account of higher-order dispersion.

我们提出了一个设计平台，以在垂直耦合的 GaN/AlN/GaN 波导中获得短波长（450 nm 附近）的大异常色散，该波导可在商用 GaN 模板晶圆技术上实现。我们通过调整波导几何形状来呈现基于色散工程的有限差分时域模拟结果，以获得大至ps (nm-km) ^{-1 的}异常色散。基于 Lugiato-Lefever 模型的数值模拟显示在蓝色光谱范围内有效的克尔频率梳生成。我们基于定制波导的几何参数来修改色散波的结果，该色散波由于高阶色散而在梳中引起不对称的光谱分布。