1. Introduction . Over the past few decades, supercontinuum (SC) generation has been an active research field due to its potential applications in high-precision frequency metrology [ 1 , 2 ], optical coherence tomography [ 3 – 5 ], and spectroscopy [ 6 ]. Usually, supercontinua are generated in the anomalous dispersion regime, in which spectral broadening is caused by high-order soliton fission and dispersive wave generation. Although usually producing a SC with a large spectral ...