| Abstract: |
| Although a solitary wave is conventionally defined as being driven by third-order nonlinearities, recent theories and experiments have proposed novel approaches that extend functionalities and applications by exploiting other nonlinear terms. In particular, the generation of harmonics via x(2) effects underpins two-color soliton generation. The physics increases in complexity and interest, as a plethora of novel stable solutions can be generated. Specifically, we show how a staircase of Eckhaus instabilities directly links the homogeneous steady state to the half-harmonic soliton in the down-converted regime. Interestingly, we found that the conversion between harmonics also facilitates dark soliton excitation at the driven wavelength, a phenomenon that is typically difficult to achieve in standard systems.
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