Fig. 1. Waveguide design. (a) The dispersion curves of different waveguide widths at a height of 0.6 μm, the illustration is a schematic diagram of the cross-section of the waveguide; (b) the variation of effective mode field area and nonlinear coefficient with wavelength when the waveguide height is 0.6 μm and the width is 1.2 μm

Fig. 2. Fabrication and characterization of GeSbSe waveguide. (a) Fabrication process of waveguide; (b) SEM of the waveguide cross-section; (c) SEM of the waveguide sidewall

Fig. 3. Experimental setup. (a) GeSbSe waveguide Raman soliton self-shift testing device; (b) the spectrum and autocorrelation curve of pump light; (c) the fundamental frequency spectrum of the pump light, illustrated as the spectrum in the 3 GHz scanning range

Fig. 4. Spectral evolution of on-chip Raman solitons. (a) Evolution of the Raman soliton spectrum in a GeSbSe waveguide with height of 0.6 μm, width of 1.2 μm, and length of 28.5 mm; (b) Raman soliton spectra in a GeSbSe waveguide with length of 15.3 mm; (c) output spectra of waveguides of different widths at the same pump power

Fig. 5. Numerical simulation of on-chip Raman solitons. (a) Spectral evolution in GeSbSe waveguides with length of 30 mm; (b) temporal evolution results; (c)(d) spectral and temporal evolution at different pump energies

Fig. 6. Design of the overhead strip waveguide. (a) Schematic diagram of the waveguide structure; (b) dispersion curves; (c)(d) spectra and temporal evolution of Raman solitons under different pump energies